jquery, coffeescript added. simple.html for a simple editor, which should look and work like openscad.
Denis Knauf
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<!DOCTYPE html>
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<html>
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<head>
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<script src="lightgl.js"></script>
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<script src="csg.js"></script>
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<script src="openjscad.js"></script>
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<script src="jquery.js"></script>
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<script src="coffee-script.js"></script>
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<style>
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body {
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font: 14px/20px 'Helvetica Neue Light', HelveticaNeue-Light, 'Helvetica Neue', Helvetica, Arial, sans-serif;
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}
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pre, code, textarea {
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font: 12px/20px Monaco, monospace;
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border: 1px solid #CCC;
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border-radius: 3px;
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background: #F9F9F9;
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padding: 0 3px;
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color: #555;
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}
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pre, textarea {
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padding: 10px;
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}
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pre {
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width: 100%;
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}
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textarea:focus {
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outline: none;
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}
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canvas {
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cursor: move;
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}
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header > *{
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display: inline-block;
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}
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</style>
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<link rel="stylesheet" href="openjscad.css" type="text/css">
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<script>
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var gProcessor=null;
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// Show all exceptions to the user:
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OpenJsCad.AlertUserOfUncaughtExceptions();
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function onload() {
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gProcessor = new OpenJsCad.Processor(document.getElementById("viewer"));
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updateSolid();
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}
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function getCode() {
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var code = document.getElementById('code').value;
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var lang = document.getElementById('lang').value;
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if( 'CoffeeScript' === lang)
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code = CoffeeScript.compile( code, { bare: 'on'});
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return code;
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}
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function updateSolid() {
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gProcessor.setJsCad( getCode());
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}
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/* http://pallieter.org/Projects/insertTab/ */
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function insertTab(o, e) {
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var kC = e.keyCode ? e.keyCode : e.charCode ? e.charCode : e.which;
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if (kC == 9 && !e.shiftKey && !e.ctrlKey && !e.altKey) {
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var oS = o.scrollTop;
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if (o.setSelectionRange) {
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var sS = o.selectionStart;
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var sE = o.selectionEnd;
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o.value = o.value.substring(0, sS) + "\t" + o.value.substr(sE);
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o.setSelectionRange(sS + 1, sS + 1);
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o.focus();
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}
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else if (o.createTextRange) {
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document.selection.createRange().text = "\t";
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e.returnValue = false;
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}
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o.scrollTop = oS;
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if (e.preventDefault)
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e.preventDefault();
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return false;
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}
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return true;
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}
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hist = [];
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function edit_history(event) {
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}
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</script>
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<title>OpenJsCad</title>
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</head>
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<body onload="onload()">
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<header>
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<h1>OpenJsCad</h1>
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[<a href='#' onclick="updateSolid(); return false;">Update</a>]
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</header>
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<div id="viewer" style="float:right;"></div>
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<div id="editor">
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<textarea id="code" name="code" onkeydown="r=insertTab(this, event);edit_history(event);return r">main = ->
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resolution = 24; # increase to get smoother corners (will get slow!)
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cube1 = CSG.roundedCube center: [0,0,0], radius: [10,10,10], roundradius: 2, resolution: resolution
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sphere1 = CSG.sphere center: [5, 5, 5], radius: 10, resolution: resolution
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sphere2 = sphere1.translate [12, 5, 0]
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sphere3 = CSG.sphere center: [20, 0, 0], radius: 30, resolution: resolution
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result = cube1
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result = result.union sphere1
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result = result.subtract sphere2
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result = result.intersect sphere3
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result</textarea>
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<br>
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<select id="lang" name="lang">
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<option>JavaScript</option>
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<option selected>CoffeeScript</option>
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</select>
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</div>
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<div id="help" style="display:none">
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<h2>Primitive solids</h2>
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Currently the following solids are supported. The parameters are passed in an object; most
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parameters are optional. 3D vectors can be passed in an array. If a scalar is passed
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for a parameter which expects a 3D vector, it is used for the x, y and z value.
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In other words: <code>radius: 1</code> will give <code>radius: [1,1,1]</code>.
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<br><br>
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All rounded solids have a 'resolution' parameter which controls tesselation. If resolution
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is set to 8, then 8 polygons per 360 degree of revolution are used. Beware that rendering
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time will increase dramatically when increasing the resolution. For a sphere the number of polygons
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increases quadratically with the resolution used.
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<br><br>
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<pre>
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// a cube:
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var cube = CSG.cube({
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center: [0, 0, 0],
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radius: [1, 1, 1]
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});
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// a sphere:
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var sphere = CSG.sphere({
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center: [0, 0, 0],
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radius: 2, // must be scalar
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resolution: 32
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});
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// a cylinder:
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var cylinder = CSG.cylinder({
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start: [0, -1, 0],
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end: [0, 1, 0],
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radius: 1,
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resolution: 16
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});
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// like a cylinder, but with spherical endpoints:
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var roundedCylinder = CSG.roundedCylinder({
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start: [0, -1, 0],
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end: [0, 1, 0],
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radius: 1,
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resolution: 16
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});
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// a rounded cube:
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var cube = CSG.roundedCube({
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center: [0, 0, 0],
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radius: 1,
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roundradius: 0.2,
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resolution: 8,
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});
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</pre>
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<h2>CSG operations</h2>
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The 3 standard CSG operations are supported. All CSG operations return a new solid; the source solids
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are not modified:
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<pre>
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var csg1 = cube.union(sphere);
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var csg2 = cube.intersect(sphere);
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var csg3 = cube.subtract(sphere);
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</pre>
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<h2>Transformations</h2>
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Solids can be translated, scaled and rotated. Multiple transforms can be combined into a single matrix transform.
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For <a href="#math">matrix and vector math see below</a>.
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<pre>
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var cube = CSG.cube();
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// translation:
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var cube2 = cube.translate([1, 2, 3]);
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// scaling:
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var largecube = cube.scale(2.0);
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var stretchedcube = cube.scale([1.5, 1, 0.5]);
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// rotation:
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var rotated1 = cube.rotateX(-45); // rotate around the X axis
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var rotated2 = cube.rotateY(90); // rotate around the Y axis
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var rotated3 = cube.rotateZ(20); // rotate around the Z axis
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// combine multiple transforms into a single matrix transform:
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var m = new CSG.Matrix4x4();
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m = m.multiply(CSG.Matrix4x4.rotationX(40));
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m = m.multiply(CSG.Matrix4x4.rotationZ(40));
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m = m.multiply(CSG.Matrix4x4.translation([-.5, 0, 0]));
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m = m.multiply(CSG.Matrix4x4.scaling([1.1, 1.2, 1.3]));
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// and apply the transform:
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var cube3 = cube.transform(m);
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</pre>
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<h2>Mirroring</h2>
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Solids can be mirrored in any plane in 3D space. For <a href="#math">plane math see below</a>.
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<pre>
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var cube = CSG.cube().translate([1,0,0]);
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var cube2 = cube.mirroredX(); // mirrored in the x=0 plane
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var cube3 = cube.mirroredY(); // mirrored in the y=0 plane
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var cube4 = cube.mirroredZ(); // mirrored in the z=0 plane
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// create a plane by specifying 3 points:
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var plane = CSG.Plane.fromPoints([5,0,0], [5, 1, 0], [3, 1, 7]);
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// and mirror in that plane:
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var cube5 = cube.mirrored(plane);
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</pre>
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<h2>Cutting by a plane</h2>
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A solid can be cut by a plane; only the part on the back side is kept:
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<pre>
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var cube = CSG.cube({radius: 10});
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// create a plane by specifying 3 points:
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var plane1 = CSG.Plane.fromPoints([5,0,0], [7, 1, 0], [3, 1, 7]);
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// or by specifying a normal and a point on the plane:
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var plane2 = CSG.Plane.fromNormalAndPoint([3, 1, 2], [5, 0, 0]);
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// and cut by the plane:
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var part1 = cube.cutByPlane(plane2);
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// or if we need the other half of the cube:
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var part2 = cube.cutByPlane(plane2.flipped());
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</pre>
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<h2>Expansion and contraction</h2>
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Expansion can be seen
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as the 3D convolution of an object with a sphere. Contraction is the reverse: the area outside the solid
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is expanded, and this is then subtracted from the solid.
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<br><br>
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Expansion and contraction are very powerful ways to get an object with nice smooth corners. For example
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a rounded cube can be created by expanding a normal cube.
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<br><br>
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Note that these are expensive operations: spheroids are created around every corner and edge in the original
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object, so the number of polygons quickly increases. Expansion and contraction therefore are only practical for simple
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non-curved objects.
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<br><br>
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expand() and contract() take two parameters: the first is the radius of expansion or contraction; the second
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parameter is optional and specififies the resolution (number of polygons on spherical surfaces, per 360 degree revolution).
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<pre>
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var cube1 = CSG.cube({radius: 1.0});
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var cube2 = CSG.cube({radius: 1.0}).translate([-0.3, -0.3, -0.3]);
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var csg = cube1.subtract(cube2);
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var rounded = csg.expand(0.2, 8);
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</pre>
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<h2>Using Properties</h2>
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The 'property' property of a solid can be used to store metadata for the object,
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for example the coordinate of a specific point of interest of the solid. Whenever
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the object is transformed (i.e. rotated, scaled or translated), the properties
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are transformed with it. So the property will keep pointing to the same point
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of interest even after several transformations have been applied to the solid.
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<br><br>
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Properties can have any type, but only the properties of classes supporting
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a 'transform' method will actually be transformed. This includes CSG.Vector3D,
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CSG.Plane and CSG.Connector. In particular CSG.Connector properties (see below)
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can be very useful: these can
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be used to attach a solid to another solid at a predetermined location regardless of the
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current orientation.
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<br><br>
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It's even possible to include a CSG solid as a property of another solid. This could
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be used for example
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to define the cutout cylinders to create matching screw holes for an object. Those 'solid properties'
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get the same transformations as the owning solid but they will not be visible in the result
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of CSG operations such as union().
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<br><br>
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Other kind of properties (for
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example, strings) will still be included in the properties of the transformed
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solid, but the properties will not get any transformation when the owning solid is transformed. <br><br>
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All primitive solids have some predefined properties, such as the center point
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of a sphere (TODO: document).
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<br><br>
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The solid resulting from CSG operations (union(), subtract(), intersect()) will get
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the merged properties of both source solids. If identically named properties exist, only
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one of them will be kept.
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<pre>
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var cube = CSG.cube({radius: 1.0});
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cube.properties.aCorner = new CSG.Vector3D([1, 1, 1]);
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cube = cube.translate([5, 0, 0]);
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cube = cube.scale(2);
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// cube.properties.aCorner will now point to [12, 2, 2],
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// which is still the same corner point
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// Properties can be stored in arrays; all properties in the array
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// will be transformed if the solid is transformed:
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cube.properties.otherCorners = [
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new CSG.Vector3D([-1, 1, 1]),
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new CSG.Vector3D([-1, -1, 1])
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];
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// and we can create sub-property objects; these must be of the
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// CSG.Properties class. All sub properties will be transformed with
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// the solid:
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cube.properties.myProperties = new CSG.Properties();
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cube.properties.myProperties.someProperty = new CSG.Vector3D([-1, -1, -1]);
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</pre>
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For an example see the <a href="servodemo.html">Servo motor</a> demo.
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<h2>Connectors</h2>
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The CSG.Connector class is intended to facilitate
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attaching two solids to each other at a predetermined
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location and orientation.
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For example suppose we have a CSG solid depicting a servo motor
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and a solid of a servo arm: by defining a Connector property for each of them, we
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can easily attach the servo arm to the servo motor at the correct position
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(i.e. the motor shaft) and orientation (i.e. arm perpendicular to the shaft)
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even if we don't know their current position and orientation
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in 3D space.<br><br>
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In other words Connector give us the freedom to rotate and translate objects at will without the need
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to keep track of their positions and boundaries. And if a third party library exposes connectors for
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its solids, the user of the library does not have to know the actual dimensions or
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shapes, only the names of the connector properties.
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<br><br>
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A CSG.Connector consist of 3 properties:<br>
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<b>point</b>: a CSG.Vector3D defining the connection point in 3D space<br>
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<b>axis</b>: a CSG.Vector3D defining the direction vector of the connection
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(in the case of the servo motor example it would point in the direction of the shaft)<br>
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<b>normal</b>: a CSG.Vector3D direction vector somewhat perpendicular to axis; this
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defines the "12 o'clock" orientation of the connection.
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<br><br>
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When connecting two connectors, the solid is transformed such that the <b>point</b>
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properties will be identical, the <b>axis</b> properties will have the same direction
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(or opposite direction if mirror == true), and the <b>normal</b>s match as much as possible.
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<br><br>
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Connectors can be connected by means of two methods:<br>
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A CSG solid's <b>connectTo()</b> function transforms a solid such that two connectors
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become connected.<br>
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Alternatively we can use a connector's <b>getTransformationTo()</b> method to obtain
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a transformation matrix which would connect the connectors. This can be used if we
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need to apply the same transform to multiple solids.
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<pre>
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var cube1 = CSG.cube({radius: 10});
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var cube2 = CSG.cube({radius: 4});
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// define a connector on the center of one face of cube1
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// The connector's axis points outwards and its normal points
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// towards the positive z axis:
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cube1.properties.myConnector = new CSG.Connector([10, 0, 0], [1, 0, 0], [0, 0, 1]);
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// define a similar connector for cube 2:
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cube2.properties.myConnector = new CSG.Connector([0, -4, 0], [0, -1, 0], [0, 0, 1]);
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// do some random transformations on cube 1:
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cube1 = cube1.rotateX(30);
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cube1 = cube1.translate([3.1, 2, 0]);
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// Now attach cube2 to cube 1:
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cube2 = cube2.connectTo(
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cube2.properties.myConnector,
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cube1.properties.myConnector,
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true, // mirror
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0 // normalrotation
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);
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// Or alternatively:
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var matrix = cube2.properties.myConnector.getTransformationTo(
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cube1.properties.myConnector,
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true, // mirror
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0 // normalrotation
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);
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cube2 = cube2.transform(matrix);
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var result = cube2.union(cube1);
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</pre>
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For a more complete example see the <a href="servodemo.html">Servo motor</a> demo.
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<h2>Determining the bounds of an object</h2>
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The getBounds() function can be used to retrieve the bounding box of an object.
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getBounds() returns
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an array with two elements specifying the minimum x,y,z coordinate and the maximum x,y,z coordinate:
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<pre>
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var cube1 = CSG.cube({radius: 10});
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var cube2 = CSG.cube({radius: 5});
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// get the right bound of cube1 and the left bound of cube2:
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var deltax = cube1.getBounds()[1].x - cube2.getBounds()[0].x;
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// align cube2 so it touches cube1:
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cube2 = cube2.translate([deltax, 0, 0]);
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return cube1.union(cube2);
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</pre>
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<h2>2D shapes</h2>
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Two dimensional shapes can be defined through the Polygon2D class. Currently this requires the polygon to be convex
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(i.e. all corners less than 180 degrees). Shapes can be transformed (rotation, translation, scaling).
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To actually use the shape it needs to be extruded into a 3D CSG object through the extrude() function. extrude()
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places the 2D solid onto the z=0 plane, and extrudes in the specified direction. Extrusion can be done with an optional
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twist. This rotates the solid around the z axis (and not necessariy around the extrusion axis) during extrusion.
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The total degrees of rotation is specified in the twistangle parameter, and twiststeps determine the number of steps
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between the bottom and top surface.
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<pre>
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// Create a shape; argument is an array of 2D coordinates
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// The shape must be convex, can be specified in clockwise or in counterclockwise direction
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var shape2d=new CSG.Polygon2D([[0,0], [5,0], [3,5], [0,5]]);
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// Do some transformations:
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shape2d=shape2d.translate([-2, -2]);
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shape2d=shape2d.rotate(20);
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shape2d=shape2d.scale([0.2, 0.2]);
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// And extrude. This creates a CSG solid:
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var extruded=shape2d.extrude({
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offset: [0.5, 0, 2], // direction for extrusion
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twistangle: 180, // top surface is rotated 180 degrees
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twiststeps: 100 // create 100 slices
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});
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</pre>
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For an example of 2D shapes see the <a href="hookdemo.html">Parametric S hook</a> demo.
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<h2>2D Paths</h2>
|
||||
A path is simply a series of points, connected by lines. A path can be open or closed (an additional line
|
||||
is drawn between the first and last point). 2D paths are supported through the CSG.Path2D class.
|
||||
<br><br>
|
||||
Paths can be contructed either by giving a series of 2D coordinates, or through the CSG.Path2D.arc() function,
|
||||
which creates a circular curved path. Paths can be concatenated, the result is a new path.
|
||||
<br><br>
|
||||
Creating a 3D solid is currently supported by the rectangularExtrude() function. This creates a 3D shape
|
||||
by following the path with a 2D rectangle (upright, perpendicular to the path direction).
|
||||
<pre>
|
||||
var path = new CSG.Path2D([[10,10], [-10,10]], /* closed = */ false);
|
||||
var anotherpath = new CSG.Path2D([[-10,-10]]);
|
||||
path = path.concat(anotherpath);
|
||||
path = path.appendPoint([10,-10]);
|
||||
path = path.close(); // close the path
|
||||
|
||||
// of course we could simply have done:
|
||||
// var path = new CSG.Path2D([[10,10], [-10,10], [-10,-10], [10,-10]], /* closed = */ true);
|
||||
|
||||
// We can make arcs and circles:
|
||||
var curvedpath = CSG.Path2D.arc({
|
||||
center: [0,0,0],
|
||||
radius: 10,
|
||||
startangle: 0,
|
||||
endangle: 180,
|
||||
resolution: 16,
|
||||
});
|
||||
|
||||
// Extrude the path by following it with a rectangle (upright, perpendicular to the path direction)
|
||||
// Returns a CSG solid
|
||||
// width: width of the extrusion, in the z=0 plane
|
||||
// height: height of the extrusion in the z direction
|
||||
// resolution: number of segments per 360 degrees for the curve in a corner
|
||||
// roundEnds: if true, the ends of the polygon will be rounded, otherwise they will be flat
|
||||
var csg = path.rectangularExtrude(3, 4, 16, true);
|
||||
return csg;
|
||||
</pre>
|
||||
|
||||
<h2>Interactive parametric models</h2>
|
||||
It is possible to make certain parameters
|
||||
editable in the browser. This allows users not familiar with JavaScript to create customized STL files.
|
||||
<br><br>
|
||||
To do so, add a function getParameterDefinitions() to your .jscad source. This function should return
|
||||
an array with parameter definitions. Currently 4 parameters types are supported: float, int, text and choice.
|
||||
The user edited values of the parameters will be supplied as an object parameter to the main() function of your .jscad file.
|
||||
<br><br>
|
||||
A float, int or text parameter is created by including the following object in the array returned by getParameterDefinitions():
|
||||
<pre>{
|
||||
name: 'width',
|
||||
type: 'float', // or 'text' or 'int'
|
||||
default: 1.23, // optional, sets the initial value
|
||||
caption: 'Width of the thingy:', // optional, displayed left of the input field
|
||||
// if omitted, the 'name' is displayed (i.e. 'width')
|
||||
}</pre>
|
||||
A 'choice' parameter is created using the following object:
|
||||
<pre>{
|
||||
name: 'shape',
|
||||
type: 'choice',
|
||||
values: ["TRI", "SQU", "CIR"], // these are the values that will be supplied to your script
|
||||
captions: ["Triangle", "Square", "Circle"], // optional, these values are shown in the listbox
|
||||
// if omitted, the items in the 'values' array are used
|
||||
caption: 'Shape:', // optional, displayed left of the input field
|
||||
default: "SQU", // optional, default selected value
|
||||
// if omitted, the first item is selected by default
|
||||
}</pre>
|
||||
To use the values add an argument to your main() function. This argument will be supplied an object
|
||||
with the user edited parameter values:
|
||||
<pre>
|
||||
function main(params)
|
||||
{
|
||||
// custom error checking:
|
||||
if(params.width <= 0) throw new Error("Width should be positive!");
|
||||
|
||||
if(params.shape == "TRI")
|
||||
{
|
||||
// do something
|
||||
}
|
||||
}
|
||||
</pre>
|
||||
|
||||
A complete example. Copy/paste it into the Playground at the top of this page to see how it works:
|
||||
<pre>
|
||||
function getParameterDefinitions() {
|
||||
return [
|
||||
{
|
||||
name: 'width',
|
||||
type: 'float',
|
||||
default: 10,
|
||||
caption: "Width of the cube:",
|
||||
},
|
||||
{
|
||||
name: 'height',
|
||||
type: 'float',
|
||||
default: 14,
|
||||
caption: "Height of the cube:",
|
||||
},
|
||||
{
|
||||
name: 'depth',
|
||||
type: 'float',
|
||||
default: 7,
|
||||
caption: "Depth of the cube:",
|
||||
},
|
||||
{
|
||||
name: 'rounded',
|
||||
type: 'choice',
|
||||
caption: 'Round the corners?',
|
||||
values: [0, 1],
|
||||
captions: ["No thanks", "Yes please"],
|
||||
default: 1,
|
||||
},
|
||||
];
|
||||
}
|
||||
|
||||
function main(params) {
|
||||
var result;
|
||||
if(params.rounded == 1)
|
||||
{
|
||||
result = CSG.roundedCube({radius: [params.width, params.height, params.depth], roundradius: 2, resolution: 32});
|
||||
}
|
||||
else
|
||||
{
|
||||
result = CSG.cube({radius: [params.width, params.height, params.depth]});
|
||||
}
|
||||
return result;
|
||||
}
|
||||
</pre>
|
||||
Or see the <a href="gearsdemo.html">Gears demo</a> for another example of interactive parameters.
|
||||
|
||||
<h2>Miscellaneous</h2>
|
||||
Solids can be given a color using the setColor(r, g, b) function. Beware: this returns a new solid,
|
||||
the original solid is not modified! Faces of the solid will keep their original color when doing
|
||||
CSG operations (union() etc). Colors values range between 0.0 and 1.0 (not 255).
|
||||
<pre>
|
||||
var cube1 = CSG.cube({radius: 10});
|
||||
cube1 = cube1.setColor(0.5, 0, 0);
|
||||
|
||||
var cube2 = CSG.cube({radius: 10});
|
||||
cube2 = cube2.setColor(0, 0.5, 0);
|
||||
cube2 = cube2.translate([5,1,4]);
|
||||
|
||||
var result = cube1.subtract(cube2);
|
||||
// the resulting solid will have faces with 2 different colors
|
||||
</pre>
|
||||
|
||||
<h2><a name="math"></a>2D and 3D Math</h2>
|
||||
There are utility classes for many 2D and 3D operations. Below is a quick summary, for details
|
||||
view the source of csg.js:
|
||||
<pre>
|
||||
// --------- Vector3D ---------------------
|
||||
var vec1 = new CSG.Vector3D(1,2,3); // 3 arguments
|
||||
var vec2 = new CSG.Vector3D( [1,2,3] ); // 1 array argument
|
||||
var vec3 = new CSG.Vector3D(vec2); // cloning a vector
|
||||
// get the values as: vec1.x, vec.y, vec1.z
|
||||
// vector math. All operations return a new vector, the original is unmodified!
|
||||
// vectors cannot be modified. Instead you should create a new vector.
|
||||
vec.negated()
|
||||
vec.abs()
|
||||
vec.plus(othervector)
|
||||
vec.minus(othervector)
|
||||
vec.times(3.0)
|
||||
vec.dividedBy(-5)
|
||||
vec.dot(othervector)
|
||||
vec.lerp(othervector, t) // linear interpolation (0 <= t <= 1)
|
||||
vec.length()
|
||||
vec.lengthSquared() // == vec.length()^2
|
||||
vec.unit()
|
||||
vec.cross(othervector) // cross product: returns a vector perpendicular to both
|
||||
vec.distanceTo(othervector)
|
||||
vec.distanceToSquared(othervector) // == vec.distanceTo(othervector)^2
|
||||
vec.equals(othervector)
|
||||
vec.multiply4x4(matrix4x4) // right multiply by a 4x4 matrix
|
||||
vec.min(othervector) // returns a new vector with the minimum x,y and z values
|
||||
vec.max(othervector) // returns a new vector with the maximum x,y and z values
|
||||
|
||||
// --------- Vector2D ---------------------
|
||||
var vec1 = new CSG.Vector2D(1,2); // 2 arguments
|
||||
var vec2 = new CSG.Vector2D( [1,2] ); // 1 array argument
|
||||
var vec3 = new CSG.Vector2D(vec2); // cloning a vector
|
||||
// vector math. All operations return a new vector, the original is unmodified!
|
||||
vec.negated()
|
||||
vec.abs()
|
||||
vec.plus(othervector)
|
||||
vec.minus(othervector)
|
||||
vec.times(3.0)
|
||||
vec.dividedBy(-5)
|
||||
vec.dot(othervector)
|
||||
vec.lerp(othervector, t) // linear interpolation (0 <= t <= 1)
|
||||
vec.length()
|
||||
vec.unit()
|
||||
vec.normal() // returns a 90 degree clockwise rotated vector
|
||||
vec.distanceTo(othervector)
|
||||
vec.equals(othervector)
|
||||
vec.multiply4x4(matrix4x4) // right multiply by a 4x4 matrix
|
||||
vec.toVector3D(z) // convert to a vector3D by adding a z coordinate
|
||||
vec.angleDegrees() // returns the angle of the vector: [1,0] = 0 degrees, [0, 1] = 90 degrees, etc
|
||||
vec.angleRadians() // ditto in radians
|
||||
var vec = CSG.Vector2D.fromAngleDegrees(degrees); // returns a vector at the specified angle
|
||||
var vec = CSG.Vector2D.fromAngleRadians(radians); // returns a vector at the specified angle
|
||||
|
||||
// --------- Matrix4x4 ---------------------
|
||||
var m1 = new CSG.Matrix4x4(); // unity matrix
|
||||
var m2 = new CSG.Matrix4x4( [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1] );
|
||||
// elements are passed in row order
|
||||
var result = m1.plus(m2);
|
||||
var result = m1.minus(m2);
|
||||
var result = m1.multiply(m2);
|
||||
// matrix vector multiplication (vectors are padded with zeroes to get a 4x1 vector):
|
||||
var vec3d = m1.rightMultiply1x3Vector(vec3d); // matrix * vector
|
||||
var vec3d = m1.leftMultiply1x3Vector(vec3d); // vector * matrix
|
||||
var vec2d = m1.rightMultiply1x2Vector(vec2d); // matrix * vector
|
||||
var vec2d = m1.leftMultiply1x2Vector(vec2d); // vector * matrix
|
||||
// common transformation matrices:
|
||||
var m = CSG.Matrix4x4.rotationX(degrees); // matrix for rotation about X axis
|
||||
var m = CSG.Matrix4x4.rotationY(degrees); // matrix for rotation about Y axis
|
||||
var m = CSG.Matrix4x4.rotationZ(degrees); // matrix for rotation about Z axis
|
||||
var m = CSG.Matrix4x4.rotation(rotationCenter, rotationAxis, degrees); // rotation about arbitrary point and axis
|
||||
var m = CSG.Matrix4x4.translation(vec3d); // translation
|
||||
var m = CSG.Matrix4x4.scaling(vec3d); // scale
|
||||
var m = CSG.Matrix4x4.mirroring(plane); // mirroring in a plane; the argument must be a CSG.Plane
|
||||
// matrix transformations can be concatenated:
|
||||
var transform = CSG.Matrix4x4.rotationX(20).multiply(CSG.Matrix4x4.rotationY(30));
|
||||
// Use a CSG solid's transform() method to apply the transformation to a CSG solid
|
||||
|
||||
// ------------ Plane --------------------------
|
||||
// a 3D plane is represented by a normal vector (should have unit length) and a distance from the origin w
|
||||
// the plane passes through normal.times(w)
|
||||
var plane1 = new CSG.Plane(normal, w);
|
||||
// Or we can construct a plane from 3 points:
|
||||
var plane2 = CSG.Plane.fromPoints(p1, p2, p3);
|
||||
// Or from a normal vector and 1 point:
|
||||
var plane3 = CSG.Plane.fromNormalAndPoint(normal, point);
|
||||
// Flip a plane (front side becomes back side):
|
||||
var plane4 = plane3.flipped();
|
||||
// Apply transformations (rotation, scaling, translation):
|
||||
var transformed = plane3.transformed(matrix4x4); // argument is a CSG.Matrix4x4
|
||||
// Intersection of plane and 3d line:
|
||||
var point = plane3.intersectWithLine(line); // argument is CSG.Line3D, returns a CSG.Vector3D
|
||||
// Intersection of 2 planes:
|
||||
var line = plane3.intersectWithPlane(plane); // argument is another CSG.Plane, returns a CSG.Line3D
|
||||
// Distance to point:
|
||||
var w = signedDistanceToPoint(point); // argument is CSG.Vector3D, returns a float (positive
|
||||
// if in front of plane, negative if in back)
|
||||
|
||||
// ------------ Line3D --------------------------
|
||||
// A line in 3d space is represented by a point and a direction vector.
|
||||
// Direction should be a unit vector. Point can be any point on the line:
|
||||
var line = new CSG.Line3D(point, direction); // argumenst are CSG.Vector3D
|
||||
// or by giving two points:
|
||||
var line = CSG.Line3D.fromPoints(p1, p2); // argumenst are CSG.Vector3D
|
||||
var point = intersectWithPlane(plane); // == plane.intersectWithLine(this)
|
||||
var line2 = line.reverse(); // same line but reverse direction
|
||||
var line2 = line.transform(matrix4x4); // for rotation, scaling, etc
|
||||
var p = line.closestPointOnLine(point); // project point onto the line
|
||||
var d = line.distanceToPoint(point);
|
||||
</pre>
|
||||
|
||||
</div> <!-- help -->
|
||||
</body>
|
||||
</html>
|
||||
Loading…
Reference in New Issue