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pickingRay optimizations and comments

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This commit is contained in:
Justin Sermeno
2011-10-05 00:43:07 -07:00
parent bc27e18424
commit 3b60963c64
1 changed files with 16 additions and 6 deletions
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src/core/Projector.js
+16 -6
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@@ -35,11 +35,12 @@ THREE.Projector = function() {
this.projectVector = function ( vector, camera ) {
_projScreenMatrix.multiply( camera.projectionMatrix, camera.matrixWorldInverse );
_projScreenMatrix.multiplyVector3( vector );
return vector;
};
this.unprojectVector = function ( vector, camera ) {
@@ -48,22 +49,31 @@ THREE.Projector = function() {
_projScreenMatrix.multiplyVector3( vector );
return vector;
};
/**
* Translates a 2D point from NDC to a THREE.Ray
* that can be used for picking.
* @vector - THREE.Vector3 that represents 2D point
* @camera - camera
*/
this.pickingRay = function ( vector, camera ) {
var end, dir, ray, t;
var end, ray, t;
// set two vectors with opposing z values
vector.z = -1.0;
end = new THREE.Vector3( vector.x, vector.y, 1.0 );
this.unprojectVector( vector, camera );
this.unprojectVector( end, camera );
dir = new THREE.Vector3();
dir.sub( end, vector );
dir.normalize();
// find direction from vector to end
end.subSelf( vector ).normalize();
return new THREE.Ray( vector, dir );
return new THREE.Ray( vector, end );
};
this.projectObjects = function ( scene, camera, sort ) {