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Added getBounds method

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This commit is contained in:
Joost Nieuwenhuijse 2012-01-21 18:03:27 +01:00
parent 47372abdbd
commit 720136cd8b
2 changed files with 60 additions and 3 deletions
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43
csg.js
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@ -320,6 +320,38 @@ CSG.prototype = {
return result;
}
},
// returns an array of two CSG.Vector3Ds (minimum coordinates and maximum coordinates)
getBounds: function() {
if(!this.cachedBoundingBox)
{
var minpoint = new CSG.Vector3D(0,0,0);
var maxpoint = new CSG.Vector3D(0,0,0);
var polygons = this.polygons;
var numpolygons = polygons.length;
for(var i=0; i < numpolygons; i++)
{
var polygon = polygons[i];
var bounds = polygon.boundingBox();
if(i == 0)
{
minpoint = bounds[0].clone();
maxpoint = bounds[1].clone();
}
else
{
minpoint.x = Math.min(minpoint.x, bounds[0].x);
minpoint.y = Math.min(minpoint.y, bounds[0].y);
minpoint.z = Math.min(minpoint.z, bounds[0].z);
maxpoint.x = Math.max(maxpoint.x, bounds[1].x);
maxpoint.y = Math.max(maxpoint.y, bounds[1].y);
maxpoint.z = Math.max(maxpoint.z, bounds[1].z);
}
}
this.cachedBoundingBox = [minpoint, maxpoint];
}
return this.cachedBoundingBox;
}
};
// Parse an option from the options object
@ -874,11 +906,18 @@ CSG.Plane = function(normal, w) {
// point is on the plane.
CSG.Plane.EPSILON = 1e-5;
CSG.Plane.fromPoints = function(a, b, c) {
CSG.Plane.fromVector3Ds = function(a, b, c) {
var n = b.minus(a).cross(c.minus(a)).unit();
return new CSG.Plane(n, n.dot(a));
};
CSG.Plane.fromPoints = function(a, b, c) {
a = new CSG.Vector3D(a);
b = new CSG.Vector3D(b);
c = new CSG.Vector3D(c);
return CSG.Plane.fromVector3Ds(a, b, c);
};
CSG.Plane.prototype = {
flipped: function() {
return new CSG.Plane(this.normal.negated(), -this.w);
@ -1119,7 +1158,7 @@ CSG.Polygon = function(vertices, shared, plane) {
}
else
{
this.plane = CSG.Plane.fromPoints(vertices[0].pos, vertices[1].pos, vertices[2].pos);
this.plane = CSG.Plane.fromVector3Ds(vertices[0].pos, vertices[1].pos, vertices[2].pos);
}
if(_CSGDEBUG)