Hello, i am having the exact same problem here.
I am trying to determine the intersection on a 3D object at a given
viewport location (view3D.mouseX, view3D.mouseY):
Here is my code:
private function _pickMesh(mesh:Mesh):PickingResult {
var pr:PickingResult = new PickingResult(); // Store picking data
here
var rayPos:Number3D = view3D.camera.unproject(view3D.mouseX,
view3D.mouseY);
// info retreived from here
// http://www.mail-archive.com/[email protected]/msg09318.html
var rayDir:Number3D = new Number3D();
rayDir.x = pMouse.x;
rayDir.y = pMouse.y;
rayDir.z = pMouse.z;
rayDir.normalize();
rayPos.add(rayPos, _view3D.camera.position);
var ray:Ray = new Ray();
var pickedPoint:Number3D;
for each (var face:Face in mesh.faces) {
pickedPoint = ray.getIntersect(rayPos , rayDir ,
face.v0.position ,
face.v1.position , face.v2.position);
if (pickedPoint!=null) {
pr.hasHit = true;
pr.point = pickedPoint;
pr.face = face;
break;
}
}
pr.mesh = mesh;
return pr;
}
The problem is I always get null.
Note: Since my mesh is a child of an Objectcontainer3D element I have
called mesh.applyRotations()
to make sure all the mesh faces are computed relative to the world
coord system.
I suspect there is a problem in the computation of the ray params
(position or direction).
Fabrice can you confirm that the signature of the Ray.getIntersect
method is as follow (no info is given in the class):
p0: ray direction (or is it position ?)
p1: ray position [in world coord system] (or is it direction?)
v0: face.v0.position [in global world coord system]
v1: face.v0.position [in global world coord system]
v2: face.v0.position [in global world coord system]
Thanks
On May 4, 12:17 am, Michael Iv <[email protected]> wrote:
> Fabrice i am trying it already for 4 hours with Sphere , but it returns null
> most of the time
>
> ///// it runs on enter frame////////////////
> for(var i:int=0;i<_sf.faces.length;++
> i){
>
> trace(_ray.getIntersect(_ray.orig,_ray.dir,_sf.faces[i].v0.position,_sf.faces[i].v1.position,_sf.faces[i].v2.position));
> }
> and basi
>
>
>
>
>
>
>
>
>
> On Tue, May 4, 2010 at 1:15 AM, Fabrice3D <[email protected]> wrote:
> > dir, origin, v0, v1, v2
> > to check if a ray hits a triangle
>
> > Fabrice
>
> > On May 3, 2010, at 9:43 PM, Michael Iv wrote:
>
> > Someone can tell me what are* v0,v1,v2* in* Ray.getIntersect(p0:Number3D,
> > p1:Number3D, v0:Number3D, v1:Number3D, v2:Number3D):Number3D* ???
> > Just can't find any example explaining these
>
> > Thanks!
>
> > --
> > Michael Ivanov ,Programmer
> > Neurotech Solutions Ltd.
> > Flex|Air |3D|Unity|
> >www.neurotechresearch.com
> > Tel:054-4962254
> > [email protected]
> > [email protected]
>
> --
> Michael Ivanov ,Programmer
> Neurotech Solutions Ltd.
> Flex|Air |3D|Unity|www.neurotechresearch.com
> Tel:054-4962254
> [email protected]
> [email protected]
