First release!
Joost Nieuwenhuijse
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index.html
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index.html
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Test!
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<!DOCTYPE html>
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<html><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="viewer.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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max-width: 800px;
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margin: 0 auto;
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padding: 10px;
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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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width: 100%;
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}
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textarea {
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height: 200px;
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}
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textarea:focus {
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outline: none;
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}
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h1, h2 { font: bold 50px/50px 'Helvetica Neue', Helvetica, Arial; }
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h2 { font-size: 30px; margin: 10px 0 0 0; }
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a { color: inherit; }
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.viewer { width: 200px; height: 200px; background: #EEE url(images.png); }
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#combined .viewer { width: 150px; height: 150px; }
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table { border-collapse: collapse; margin: 0 auto; }
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td { padding: 5px; text-align: center; }
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td code { background: none; border: none; color: inherit; }
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canvas { cursor: move; }
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</style>
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<script>
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var gViewer=null;
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var gSolid=new CSG();
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var gSolidSource="";
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function onload()
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{
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gViewer = new Viewer(new CSG(), 600, 600, 5);
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document.getElementById("viewer").appendChild(gViewer.gl.canvas);
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}
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function updateSolid()
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{
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var code=document.getElementById('code').value;
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if(code != gSolidSource)
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{
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gSolidSource=code;
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var errdiv=document.getElementById('error');
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try {
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gSolid = new Function(code)();
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if( (typeof(gSolid) != "object") || (!('polygons' in gSolid)))
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{
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throw new Error("Your javascript code should return a CSG object. Try for example: return CSG.cube();");
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}
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errdiv.innerHTML = '';
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} catch (e) {
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errdiv.innerHTML = 'Error: <code>' + e.toString().replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>') + '</code>';
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gSolid=new CSG();
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}
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gViewer.mesh = gSolid.toMesh();
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gViewer.gl.ondraw();
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}
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}
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function updatePreview()
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{
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updateSolid();
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}
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function getStl()
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{
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updateSolid();
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var stl=gSolid.toStlString();
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document.getElementById('stloutput').value=stl;
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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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<h1>OpenJsCad</h1>
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Please note: currently only works reliably in Google Chrome!<br>
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Create an STL file using constructive solid modeling. Click <b>Update Preview</b> to parse the source code from the textarea.
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Click Get STL to generate the stl data, ready for 3d printing. See below for documentation.
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<table>
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<tr>
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<td><div id="viewer" class="viewer" style="background-image:none;width:600px;height:600px;"></div></td>
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</tr>
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</table>
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<textarea id="code">var resolution = 24; // increase to get smoother corners (will get slow!)
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var cube1 = CSG.roundedCube({center: [0,0,0], radius: [1,1,1], roundradius: 0.2, resolution: resolution});
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var sphere1 = CSG.sphere({center: [0.5, 0.5, 0.5], radius: 1, resolution: resolution });
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var sphere2 = sphere1.translate([1.2, 0.5, 0]);
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var sphere3 = CSG.sphere({center: [2, 0, 0], radius: 3, resolution: resolution });
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var 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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return result;
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</textarea>
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<p id="error"></p>
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<br>
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<input type="submit" value="Update Preview" onclick="updatePreview(); return false;"><br>
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<input type="submit" value="Get STL" onclick="getStl(); return false;"><br>
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<textarea id="stloutput" readonly style="width: 80%; height: 100px"></textarea>
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<br>
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<h1>About</h1>
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This is intended to become a Javascript based alternative to <a href="http://www.openscad.org/">OpenSCAD</a>,
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for 3D solid modeling.
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CSG model is contructed using Javascript. For example:<br>
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<code>var cube = CSG.cube(); return cube;</code> creates a cube with a radius of 1 and centered at the origin.
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Enter javascript code in the textbox above. The code should end in a return statement, returning a CSG solid.
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Click on Update Preview to generate the mesh and update the viewer.
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<br><br>
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Click Get STL to generate the STL file. Create a file with .stl extension in a text editor and paste the contents
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of the box into this file; this is ready to be printed on your 3d printer.
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<h2>License</h2>
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Copyright (c) 2012 Joost Nieuwenhuijse.
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Uses CSG.js, <a href="https://github.com/evanw/csg.js">original</a> copyright (c) 2011 Evan Wallace,
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<a href="https://github.com/joostn/csg.js">extensively modified</a>, copyright (c) 2012 Joost Nieuwenhuijse.
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Uses <a href="https://github.com/evanw/lightgl.js">lightgl.js</a> by Evan Wallace for WebGL rendering.
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All code released under MIT license.
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<br><br>
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Contributions are welcome! To contribute go to <a href="https://github.com/joostn/csg.js">CSG.js at GitHub</a>,
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<a href="http://help.github.com/fork-a-repo/">create your own fork</a> and
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<a href="http://help.github.com/send-pull-requests/">send me a pull request</a>.
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<h2>Viewer navigation</h2>
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Click and drag to rotate the model around the origin.<br>
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Shift+Drag moves the model around.<br>
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Alt+drag zooms (by changing the distance between camera and model).
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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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<br><br>
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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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<br><br>
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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>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>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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</body>
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</html>
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/*
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* lightgl.js
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* http://github.com/evanw/lightgl.js/
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*
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* Copyright 2011 Evan Wallace
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* Released under the MIT license
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*/
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var GL=function(){function I(){d.MODELVIEW=C|1;d.PROJECTION=C|2;var b=new n,c=new n;d.modelviewMatrix=new n;d.projectionMatrix=new n;var a=[],f=[],g,j;d.matrixMode=function(h){switch(h){case d.MODELVIEW:g="modelviewMatrix";j=a;break;case d.PROJECTION:g="projectionMatrix";j=f;break;default:throw"invalid matrix mode "+h;}};d.loadIdentity=function(){n.identity(d[g])};d.loadMatrix=function(h){h=h.m;for(var i=d[g].m,m=0;m<16;m++)i[m]=h[m]};d.multMatrix=function(h){d.loadMatrix(n.multiply(d[g],h,c))};d.perspective=
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function(h,i,m,k){d.multMatrix(n.perspective(h,i,m,k,b))};d.frustum=function(h,i,m,k,o,p){d.multMatrix(n.frustum(h,i,m,k,o,p,b))};d.ortho=function(h,i,m,k,o,p){d.multMatrix(n.ortho(h,i,m,k,o,p,b))};d.scale=function(h,i,m){d.multMatrix(n.scale(h,i,m,b))};d.translate=function(h,i,m){d.multMatrix(n.translate(h,i,m,b))};d.rotate=function(h,i,m,k){d.multMatrix(n.rotate(h,i,m,k,b))};d.lookAt=function(h,i,m,k,o,p,J,K,L){d.multMatrix(n.lookAt(h,i,m,k,o,p,J,K,L,b))};d.pushMatrix=function(){j.push(Array.prototype.slice.call(d[g].m))};
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d.popMatrix=function(){var h=j.pop();d[g].m=D?new Float32Array(h):h};d.project=function(h,i,m,k,o,p){k=k||d.modelviewMatrix;o=o||d.projectionMatrix;p=p||d.getParameter(d.VIEWPORT);h=o.transformPoint(k.transformPoint(new l(h,i,m)));return new l(p[0]+p[2]*(h.x*0.5+0.5),p[1]+p[3]*(h.y*0.5+0.5),h.z*0.5+0.5)};d.unProject=function(h,i,m,k,o,p){k=k||d.modelviewMatrix;o=o||d.projectionMatrix;p=p||d.getParameter(d.VIEWPORT);h=new l((h-p[0])/p[2]*2-1,(i-p[1])/p[3]*2-1,m*2-1);return n.inverse(n.multiply(o,k,
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b),c).transformPoint(h)};d.matrixMode(d.MODELVIEW)}function M(){var b={mesh:new q({coords:true,colors:true,triangles:false}),mode:-1,coord:[0,0,0,0],color:[1,1,1,1],pointSize:1,shader:new y("uniform float pointSize;varying vec4 color;varying vec4 coord;varying vec2 pixel;void main(){color=gl_Color;coord=gl_TexCoord;gl_Position=gl_ModelViewProjectionMatrix*gl_Vertex;pixel=gl_Position.xy/gl_Position.w*0.5+0.5;gl_PointSize=pointSize;}",
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"uniform sampler2D texture;uniform float pointSize;uniform bool useTexture;uniform vec2 windowSize;varying vec4 color;varying vec4 coord;varying vec2 pixel;void main(){gl_FragColor=color;if(useTexture)gl_FragColor*=texture2D(texture,coord.xy);}")};d.pointSize=function(c){b.shader.uniforms({pointSize:c})};d.begin=function(c){if(b.mode!=-1)throw"mismatched gl.begin() and gl.end() calls";b.mode=c;b.mesh.colors=[];b.mesh.coords=
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[];b.mesh.vertices=[]};d.color=function(c,a,f,g){b.color=arguments.length==1?c.toArray().concat(1):[c,a,f,g||1]};d.texCoord=function(c,a){b.coord=arguments.length==1?c.toArray(2):[c,a]};d.vertex=function(c,a,f){b.mesh.colors.push(b.color);b.mesh.coords.push(b.coord);b.mesh.vertices.push(arguments.length==1?c.toArray():[c,a,f])};d.end=function(){if(b.mode==-1)throw"mismatched gl.begin() and gl.end() calls";b.mesh.compile();b.shader.uniforms({windowSize:[d.canvas.width,d.canvas.height],useTexture:!!d.getParameter(d.TEXTURE_BINDING_2D)}).draw(b.mesh,
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b.mode);b.mode=-1}}function N(){function b(){for(var k in i)if(i[k])return true;return false}function c(k){e=Object.create(k);e.original=k;e.x=e.pageX;e.y=e.pageY;for(k=d.canvas;k;k=k.offsetParent){e.x-=k.offsetLeft;e.y-=k.offsetTop}if(m){e.deltaX=e.x-j;e.deltaY=e.y-h}else{e.deltaX=0;e.deltaY=0;m=true}j=e.x;h=e.y;e.dragging=b();e.preventDefault=function(){e.original.preventDefault()};e.stopPropagation=function(){e.original.stopPropagation()};return e}function a(k){k=c(k);d.onmousemove&&d.onmousemove(k);
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k.preventDefault()}function f(k){i[k.which]=false;if(!b()){document.removeEventListener("mousemove",a);document.removeEventListener("mouseup",f);d.canvas.addEventListener("mousemove",a);d.canvas.addEventListener("mouseup",f)}k=c(k);d.onmouseup&&d.onmouseup(k);k.preventDefault()}function g(){m=false}var j=0,h=0,i={},m=false;z(d.canvas,"mousedown",function(k){if(!b()){document.addEventListener("mousemove",a);document.addEventListener("mouseup",f);d.canvas.removeEventListener("mousemove",a);d.canvas.removeEventListener("mouseup",
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f)}i[k.which]=true;k=c(k);d.onmousedown&&d.onmousedown(k);k.preventDefault()});d.canvas.addEventListener("mousemove",a);d.canvas.addEventListener("mouseup",f);d.canvas.addEventListener("mouseover",g);d.canvas.addEventListener("mouseout",g)}function E(b){return{8:"BACKSPACE",9:"TAB",13:"ENTER",16:"SHIFT",27:"ESCAPE",32:"SPACE",37:"LEFT",38:"UP",39:"RIGHT",40:"DOWN"}[b]||(b>=65&&b<=90?String.fromCharCode(b):null)}function z(b,c,a){b.addEventListener(c,a)}function O(){(function(b){d.makeCurrent=function(){d=
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b}})(d);d.animate=function(){function b(){d=f;var g=new Date;d.onupdate&&d.onupdate((g-a)/1E3);d.ondraw&&d.ondraw();c(b);a=g}var c=window.requestAnimationFrame||window.mozRequestAnimationFrame||window.webkitRequestAnimationFrame||function(g){setTimeout(g,1E3/60)},a=new Date,f=d;b()};d.fullscreen=function(b){function c(){d.canvas.width=window.innerWidth-f-g;d.canvas.height=window.innerHeight-a-j;d.viewport(0,0,d.canvas.width,d.canvas.height);if(b.camera||!("camera"in b)){d.matrixMode(d.PROJECTION);
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d.loadIdentity();d.perspective(b.fov||45,d.canvas.width/d.canvas.height,b.near||0.1,b.far||1E3);d.matrixMode(d.MODELVIEW)}d.ondraw&&d.ondraw()}b=b||{};var a=b.paddingTop||0,f=b.paddingLeft||0,g=b.paddingRight||0,j=b.paddingBottom||0;if(!document.body)throw"document.body doesn't exist yet (call gl.fullscreen() from window.onload() or from inside the <body> tag)";document.body.appendChild(d.canvas);document.body.style.overflow="hidden";d.canvas.style.position="absolute";d.canvas.style.left=f+"px";d.canvas.style.top=
|
||||
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o[15]=1;return k};w.prototype={add:function(b){var c=JSON.stringify(b);if(!(c in this.map)){this.map[c]=this.unique.length;this.unique.push(b)}return this.map[c]}};x.prototype={compile:function(b){for(var c=[],a=0;a<this.data.length;a+=1E4)c=Array.prototype.concat.apply(c,this.data.slice(a,a+1E4));a=this.data.length?c.length/this.data.length:0;if(a!=Math.round(a))throw"buffer elements not of consistent size, average size is "+a;this.buffer=this.buffer||d.createBuffer();this.buffer.length=c.length;
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this.triangles[b],a=l.fromArray(this.vertices[c[0]]),f=l.fromArray(this.vertices[c[1]]),g=l.fromArray(this.vertices[c[2]]);a=f.subtract(a).cross(g.subtract(a)).unit();this.normals[c[0]]=this.normals[c[0]].add(a);this.normals[c[1]]=this.normals[c[1]].add(a);this.normals[c[2]]=this.normals[c[2]].add(a)}for(b=0;b<this.vertices.length;b++)this.normals[b]=this.normals[b].unit().toArray();this.compile();return this},computeWireframe:function(){for(var b=new w,c=0;c<this.triangles.length;c++)for(var a=this.triangles[c],
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1]);c.triangles.push([g+detailX+1,g+1,g+detailX+2])}}c.compile();return c};var G=[[0,4,2,6,-1,0,0],[1,3,5,7,+1,0,0],[0,1,4,5,0,-1,0],[2,6,3,7,0,+1,0],[0,2,1,3,0,0,-1],[4,5,6,7,0,0,+1]];q.cube=function(b){b=new q(b);for(var c=0;c<G.length;c++){for(var a=G[c],f=c*4,g=0;g<4;g++){b.vertices.push(F(a[g]).toArray());b.coords&&b.coords.push([g&1,(g&2)/2]);b.normals&&b.normals.push(a.slice(4,7))}b.triangles.push([f,f+1,f+2]);b.triangles.push([f+2,f+1,f+3])}b.compile();return b};q.sphere=function(b){b=b||
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|
||||
h=l.min(g,j);g=l.max(g,j);h=h.max();g=g.min();if(h>0&&h<g){b=b.add(c.multiply(h));a=a.add(1.0E-6);f=f.subtract(1.0E-6);return new t(h,b,new l((b.x>f.x)-(b.x<a.x),(b.y>f.y)-(b.y<a.y),(b.z>f.z)-(b.z<a.z)))}return null};u.hitTestSphere=function(b,c,a,f){var g=b.subtract(a),j=c.dot(c),h=2*c.dot(g);g=g.dot(g)-f*f;g=h*h-4*j*g;if(g>0){j=(-h-Math.sqrt(g))/(2*j);b=b.add(c.multiply(j));return new t(j,b,b.subtract(a).divide(f))}return null};u.hitTestTriangle=function(b,c,a,f,g){var j=f.subtract(a),h=g.subtract(a);
|
||||
g=j.cross(h).unit();f=g.dot(a.subtract(b)).divide(g.dot(c));if(f>0){b=b.add(c.multiply(f));var i=b.subtract(a);a=h.dot(h);c=h.dot(j);h=h.dot(i);var m=j.dot(j);j=j.dot(i);i=a*m-c*c;m=(m*h-c*j)/i;j=(a*j-c*h)/i;if(m>=0&&j>=0&&m+j<=1)return new t(f,b,g)}return null};var P=new n,H=new n;y.prototype={uniforms:function(b){d.useProgram(this.program);for(var c in b){var a=d.getUniformLocation(this.program,c);if(a){var f=b[c];if(f instanceof l)f=[f.x,f.y,f.z];else if(f instanceof n)f=f.m;var g=Object.prototype.toString.call(f);
|
||||
if(g=="[object Array]"||g=="[object Float32Array]")switch(f.length){case 1:d.uniform1fv(a,new Float32Array(f));break;case 2:d.uniform2fv(a,new Float32Array(f));break;case 3:d.uniform3fv(a,new Float32Array(f));break;case 4:d.uniform4fv(a,new Float32Array(f));break;case 9:d.uniformMatrix3fv(a,false,new Float32Array([f[0],f[3],f[6],f[1],f[4],f[7],f[2],f[5],f[8]]));break;case 16:d.uniformMatrix4fv(a,false,new Float32Array([f[0],f[4],f[8],f[12],f[1],f[5],f[9],f[13],f[2],f[6],f[10],f[14],f[3],f[7],f[11],
|
||||
f[15]]));break;default:throw"don't know how to load uniform \""+c+'" of length '+f.length;}else{g=Object.prototype.toString.call(f);if(g=="[object Number]"||g=="[object Boolean]")(this.isSampler[c]?d.uniform1i:d.uniform1f).call(d,a,f);else throw'attempted to set uniform "'+c+'" to invalid value '+f;}}}return this},draw:function(b,c){this.drawBuffers(b.vertexBuffers,b.indexBuffers[c==d.LINES?"lines":"triangles"],arguments.length<2?d.TRIANGLES:c)},drawBuffers:function(b,c,a){this.uniforms({_gl_ModelViewMatrix:d.modelviewMatrix,
|
||||
_gl_ProjectionMatrix:d.projectionMatrix});this.needsMVPM&&this.uniforms({_gl_ModelViewProjectionMatrix:n.multiply(d.projectionMatrix,d.modelviewMatrix,H)});if(this.needsNM){var f=n.transpose(n.inverse(d.modelviewMatrix,P),H).m;this.uniforms({_gl_NormalMatrix:[f[0],f[1],f[2],f[4],f[5],f[6],f[8],f[9],f[10]]})}f=0;for(var g in b){var j=b[g],h=this.attributes[g]||d.getAttribLocation(this.program,g.replace(/^gl_/,"_gl_"));if(!(h==-1||!j.buffer)){this.attributes[g]=h;d.bindBuffer(d.ARRAY_BUFFER,j.buffer);
|
||||
d.enableVertexAttribArray(h);d.vertexAttribPointer(h,j.buffer.spacing,d.FLOAT,false,0,0);f=j.buffer.length/j.buffer.spacing}}for(g in this.attributes)g in b||d.disableVertexAttribArray(this.attributes[g]);if(f&&(!c||c.buffer))if(c){d.bindBuffer(d.ELEMENT_ARRAY_BUFFER,c.buffer);d.drawElements(a,c.buffer.length,d.UNSIGNED_SHORT,0)}else d.drawArrays(a,0,f);return this}};var A,r,B;s.prototype={bind:function(b){d.activeTexture(d.TEXTURE0+(b||0));d.bindTexture(d.TEXTURE_2D,this.id)},unbind:function(b){d.activeTexture(d.TEXTURE0+
|
||||
(b||0));d.bindTexture(d.TEXTURE_2D,null)},drawTo:function(b){var c=d.getParameter(d.VIEWPORT);A=A||d.createFramebuffer();r=r||d.createRenderbuffer();d.bindFramebuffer(d.FRAMEBUFFER,A);d.bindRenderbuffer(d.RENDERBUFFER,r);if(this.width!=r.width||this.height!=r.height){r.width=this.width;r.height=this.height;d.renderbufferStorage(d.RENDERBUFFER,d.DEPTH_COMPONENT16,this.width,this.height)}d.framebufferTexture2D(d.FRAMEBUFFER,d.COLOR_ATTACHMENT0,d.TEXTURE_2D,this.id,0);d.framebufferRenderbuffer(d.FRAMEBUFFER,
|
||||
d.DEPTH_ATTACHMENT,d.RENDERBUFFER,r);d.viewport(0,0,this.width,this.height);b();d.bindFramebuffer(d.FRAMEBUFFER,null);d.bindRenderbuffer(d.RENDERBUFFER,null);d.viewport(c[0],c[1],c[2],c[3])},swapWith:function(b){var c;c=b.id;b.id=this.id;this.id=c;c=b.width;b.width=this.width;this.width=c;c=b.height;b.height=this.height;this.height=c}};s.fromImage=function(b,c){c=c||{};var a=new s(b.width,b.height,c);try{d.texImage2D(d.TEXTURE_2D,0,a.format,a.format,a.type,b)}catch(f){if(location.protocol=="file:")throw'image not loaded for security reasons (serve this page over "http://" instead)';
|
||||
else throw"image not loaded for security reasons (image must originate from the same domain as this page or use Cross-Origin Resource Sharing)";}c.minFilter&&c.minFilter!=d.NEAREST&&c.minFilter!=d.LINEAR&&d.generateMipmap(d.TEXTURE_2D);return a};s.fromURL=function(b,c){B=B||function(){var g=document.createElement("canvas").getContext("2d");g.canvas.width=g.canvas.height=128;for(var j=0;j<g.canvas.height;j+=16)for(var h=0;h<g.canvas.width;h+=16){g.fillStyle=(h^j)&16?"#FFF":"#DDD";g.fillRect(h,j,16,
|
||||
16)}return g.canvas}();var a=s.fromImage(B,c),f=new Image;f.onload=function(){s.fromImage(f,c).swapWith(a)};f.src=b;return a};l.prototype={negative:function(){return new l(-this.x,-this.y,-this.z)},add:function(b){return b instanceof l?new l(this.x+b.x,this.y+b.y,this.z+b.z):new l(this.x+b,this.y+b,this.z+b)},subtract:function(b){return b instanceof l?new l(this.x-b.x,this.y-b.y,this.z-b.z):new l(this.x-b,this.y-b,this.z-b)},multiply:function(b){return b instanceof l?new l(this.x*b.x,this.y*b.y,this.z*
|
||||
b.z):new l(this.x*b,this.y*b,this.z*b)},divide:function(b){return b instanceof l?new l(this.x/b.x,this.y/b.y,this.z/b.z):new l(this.x/b,this.y/b,this.z/b)},equals:function(b){return this.x==b.x&&this.y==b.y&&this.z==b.z},dot:function(b){return this.x*b.x+this.y*b.y+this.z*b.z},cross:function(b){return new l(this.y*b.z-this.z*b.y,this.z*b.x-this.x*b.z,this.x*b.y-this.y*b.x)},length:function(){return Math.sqrt(this.dot(this))},unit:function(){return this.divide(this.length())},min:function(){return Math.min(Math.min(this.x,
|
||||
this.y),this.z)},max:function(){return Math.max(Math.max(this.x,this.y),this.z)},toAngles:function(){return{theta:Math.atan2(this.z,this.x),phi:Math.asin(this.y/this.length())}},toArray:function(b){return[this.x,this.y,this.z].slice(0,b||3)},clone:function(){return new l(this.x,this.y,this.z)},init:function(b,c,a){this.x=b;this.y=c;this.z=a;return this}};l.negative=function(b,c){c.x=-b.x;c.y=-b.y;c.z=-b.z;return c};l.add=function(b,c,a){if(c instanceof l){a.x=b.x+c.x;a.y=b.y+c.y;a.z=b.z+c.z}else{a.x=
|
||||
b.x+c;a.y=b.y+c;a.z=b.z+c}return a};l.subtract=function(b,c,a){if(c instanceof l){a.x=b.x-c.x;a.y=b.y-c.y;a.z=b.z-c.z}else{a.x=b.x-c;a.y=b.y-c;a.z=b.z-c}return a};l.multiply=function(b,c,a){if(c instanceof l){a.x=b.x*c.x;a.y=b.y*c.y;a.z=b.z*c.z}else{a.x=b.x*c;a.y=b.y*c;a.z=b.z*c}return a};l.divide=function(b,c,a){if(c instanceof l){a.x=b.x/c.x;a.y=b.y/c.y;a.z=b.z/c.z}else{a.x=b.x/c;a.y=b.y/c;a.z=b.z/c}return a};l.cross=function(b,c,a){a.x=b.y*c.z-b.z*c.y;a.y=b.z*c.x-b.x*c.z;a.z=b.x*c.y-b.y*c.x;return a};
|
||||
l.unit=function(b,c){var a=b.length();c.x=b.x/a;c.y=b.y/a;c.z=b.z/a;return c};l.fromAngles=function(b,c){return new l(Math.cos(b)*Math.cos(c),Math.sin(c),Math.sin(b)*Math.cos(c))};l.randomDirection=function(){return l.fromAngles(Math.random()*Math.PI*2,Math.asin(Math.random()*2-1))};l.min=function(b,c){return new l(Math.min(b.x,c.x),Math.min(b.y,c.y),Math.min(b.z,c.z))};l.max=function(b,c){return new l(Math.max(b.x,c.x),Math.max(b.y,c.y),Math.max(b.z,c.z))};l.lerp=function(b,c,a){return c.subtract(b).multiply(a).add(b)};
|
||||
l.fromArray=function(b){return new l(b[0],b[1],b[2])};return v}();
|
||||
|
|
@ -0,0 +1,192 @@
|
|||
// Draw triangle lines:
|
||||
Viewer.drawLines = false;
|
||||
// Set to true so lines don't use the depth buffer
|
||||
Viewer.lineOverlay = false;
|
||||
|
||||
// Set the color of all polygons in this solid
|
||||
CSG.prototype.setColor = function(r, g, b) {
|
||||
this.toPolygons().map(function(polygon) {
|
||||
polygon.shared = [r, g, b];
|
||||
});
|
||||
};
|
||||
|
||||
// Convert from CSG solid to GL.Mesh object
|
||||
CSG.prototype.toMesh = function() {
|
||||
var csg = this.canonicalized();
|
||||
var mesh = new GL.Mesh({ normals: true, colors: true });
|
||||
var vertexTag2Index = {};
|
||||
var vertices = [];
|
||||
var colors = [];
|
||||
var triangles = [];
|
||||
// set to true if we want to use interpolated vertex normals
|
||||
// this creates nice round spheres but does not represent the shape of
|
||||
// the actual model
|
||||
var smoothlighting = false;
|
||||
var polygons = csg.toPolygons();
|
||||
var numpolygons = polygons.length;
|
||||
for(var polygonindex = 0; polygonindex < numpolygons; polygonindex++)
|
||||
{
|
||||
var polygon = polygons[polygonindex];
|
||||
var indices = polygon.vertices.map(function(vertex) {
|
||||
var vertextag = vertex.getTag();
|
||||
var vertexindex;
|
||||
if(smoothlighting && (vertextag in vertexTag2Index))
|
||||
{
|
||||
vertexindex = vertexTag2Index[vertextag];
|
||||
}
|
||||
else
|
||||
{
|
||||
vertexindex = vertices.length;
|
||||
vertexTag2Index[vertextag] = vertexindex;
|
||||
vertices.push([vertex.pos.x, vertex.pos.y, vertex.pos.z]);
|
||||
colors.push([0,0,1]);
|
||||
}
|
||||
return vertexindex;
|
||||
});
|
||||
for (var i = 2; i < indices.length; i++) {
|
||||
triangles.push([indices[0], indices[i - 1], indices[i]]);
|
||||
}
|
||||
}
|
||||
mesh.triangles = triangles;
|
||||
mesh.vertices = vertices;
|
||||
mesh.colors = colors;
|
||||
mesh.computeWireframe();
|
||||
mesh.computeNormals();
|
||||
return mesh;
|
||||
};
|
||||
|
||||
|
||||
var viewers = [];
|
||||
|
||||
|
||||
// A viewer is a WebGL canvas that lets the user view a mesh. The user can
|
||||
// tumble it around by dragging the mouse.
|
||||
function Viewer(csg, width, height, depth) {
|
||||
|
||||
var angleX = 0;
|
||||
var angleY = 0;
|
||||
var viewpointX = 0;
|
||||
var viewpointY = 0;
|
||||
|
||||
viewers.push(this);
|
||||
|
||||
// Get a new WebGL canvas
|
||||
var gl = GL.create();
|
||||
this.gl = gl;
|
||||
this.mesh = csg.toMesh();
|
||||
|
||||
// Set up the viewport
|
||||
gl.canvas.width = width;
|
||||
gl.canvas.height = height;
|
||||
gl.viewport(0, 0, width, height);
|
||||
gl.matrixMode(gl.PROJECTION);
|
||||
gl.loadIdentity();
|
||||
gl.perspective(45, width / height, 0.1, 100);
|
||||
gl.matrixMode(gl.MODELVIEW);
|
||||
|
||||
// Set up WebGL state
|
||||
gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
|
||||
gl.clearColor(0.93, 0.93, 0.93, 1);
|
||||
gl.enable(gl.DEPTH_TEST);
|
||||
gl.enable(gl.CULL_FACE);
|
||||
gl.polygonOffset(1, 1);
|
||||
|
||||
// Black shader for wireframe
|
||||
this.blackShader = new GL.Shader('\
|
||||
void main() {\
|
||||
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\
|
||||
}\
|
||||
', '\
|
||||
void main() {\
|
||||
gl_FragColor = vec4(0.0, 0.0, 0.0, 0.1);\
|
||||
}\
|
||||
');
|
||||
|
||||
// Shader with diffuse and specular lighting
|
||||
this.lightingShader = new GL.Shader('\
|
||||
varying vec3 color;\
|
||||
varying vec3 normal;\
|
||||
varying vec3 light;\
|
||||
void main() {\
|
||||
const vec3 lightDir = vec3(1.0, 2.0, 3.0) / 3.741657386773941;\
|
||||
light = lightDir;\
|
||||
color = gl_Color.rgb;\
|
||||
normal = gl_NormalMatrix * gl_Normal;\
|
||||
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\
|
||||
}\
|
||||
', '\
|
||||
varying vec3 color;\
|
||||
varying vec3 normal;\
|
||||
varying vec3 light;\
|
||||
void main() {\
|
||||
vec3 n = normalize(normal);\
|
||||
float diffuse = max(0.0, dot(light, n));\
|
||||
float specular = pow(max(0.0, -reflect(light, n).z), 10.0) * sqrt(diffuse);\
|
||||
gl_FragColor = vec4(mix(color * (0.3 + 0.7 * diffuse), vec3(1.0), specular), 1.0);\
|
||||
}\
|
||||
');
|
||||
|
||||
var _this=this;
|
||||
gl.onmousemove = function(e) {
|
||||
if (e.dragging) {
|
||||
e.preventDefault();
|
||||
if(e.altKey)
|
||||
{
|
||||
var factor = 1e-2;
|
||||
depth *= Math.pow(2,factor * e.deltaY);
|
||||
}
|
||||
else if(e.shiftKey)
|
||||
{
|
||||
var factor = 5e-3;
|
||||
viewpointX += factor * e.deltaX * depth;
|
||||
viewpointY -= factor * e.deltaY * depth;
|
||||
}
|
||||
else
|
||||
{
|
||||
angleY += e.deltaX * 2;
|
||||
angleX += e.deltaY * 2;
|
||||
angleX = Math.max(-90, Math.min(90, angleX));
|
||||
}
|
||||
|
||||
_this.gl.ondraw();
|
||||
}
|
||||
};
|
||||
|
||||
gl.onmousewheel = function(e) {
|
||||
e.preventDefault();
|
||||
var delta = e.wheelDelta();
|
||||
var factor = 1e-5;
|
||||
depth *= Math.pow(factor * delta);
|
||||
};
|
||||
|
||||
var that = this;
|
||||
gl.ondraw = function() {
|
||||
gl.makeCurrent();
|
||||
|
||||
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
|
||||
gl.loadIdentity();
|
||||
gl.translate(viewpointX, viewpointY, -depth);
|
||||
gl.rotate(angleX, 1, 0, 0);
|
||||
gl.rotate(angleY, 0, 1, 0);
|
||||
|
||||
if (!Viewer.lineOverlay) gl.enable(gl.POLYGON_OFFSET_FILL);
|
||||
that.lightingShader.draw(that.mesh, gl.TRIANGLES);
|
||||
if (!Viewer.lineOverlay) gl.disable(gl.POLYGON_OFFSET_FILL);
|
||||
|
||||
if(Viewer.drawLines)
|
||||
{
|
||||
if (Viewer.lineOverlay) gl.disable(gl.DEPTH_TEST);
|
||||
gl.enable(gl.BLEND);
|
||||
that.blackShader.draw(that.mesh, gl.LINES);
|
||||
gl.disable(gl.BLEND);
|
||||
if (Viewer.lineOverlay) gl.enable(gl.DEPTH_TEST);
|
||||
}
|
||||
};
|
||||
|
||||
gl.ondraw();
|
||||
}
|
||||
|
||||
var nextID = 0;
|
||||
function addViewer(viewer) {
|
||||
document.getElementById(nextID++).appendChild(viewer.gl.canvas);
|
||||
}
|
||||
Loading…
Reference in New Issue