Hi Fabrice , did you implement the Ray Class in the example you have given
here for sphere intersection . I have tried everything and still
ray.getIntersect () returns null . What can be wrong in what I do here ?
////////////////////////code//////////////////////////////////
package
{
import away3d.core.base.Face;
import away3d.core.base.Segment;
import away3d.core.base.Vertex;
import away3d.core.draw.ScreenVertex;
import away3d.core.math.Number3D;
import away3d.core.utils.Cast;
import away3d.materials.BitmapMaterial;
import away3d.materials.ColorMaterial;
import away3d.materials.utils.data.Ray;
import away3d.primitives.Sphere;
import away3d.sprites.DirSprite2D;
import away3d.sprites.Sprite2D;
import away3d.sprites.Sprite3D;
import flash.display.BitmapData;
import flash.events.Event;
import utils.RayDebugger;
[SWF(backgroundColor="#677999", frameRate="30", quality="LOW",
width="800", height="600")]
public class RayTracingDemo extends AwayTemplate
{
private var _rayDebug:RayDebugger;
private var _sp:Sphere;
private var _ray:Ray;
private var _screenVertex:ScreenVertex;
private var _vertex:Vertex;
private var _sprite3:Sprite3D;
private var _traceDefaultPos:Number3D=new Number3D(-100,100,-100);
public function RayTracingDemo()
{
super();
}
override protected function initGeometry() : void{
RayDebugger.setView(_view);
_sp=new Sphere({radius:30,material:new ColorMaterial(0x339955)});
_view.scene.addChild(_sp);
_sp.z=500;
_sp.y=0;
_sp.x=0;
_ray=new Ray();
}
override protected function onEnterFrame(e:Event) : void{
super.onEnterFrame(e);
var mouseDir1:Number3D=_cam.unproject(mouseX-400,mouseY-300);
mouseDir1.x*=10;
mouseDir1.y*=10;
mouseDir1.z*=10;
_ray.orig= _cam.position;
_ray.dir= mouseDir1;///_sp.position;///_cam.transform.forward;
for(var b:int=0;b<_sp.faces.length;++b){
var face:Face=_sp.faces[b];
_ray.orig= _traceDefaultPos;
_ray.dir= mouseDir1;d;
trace(
_ray.getIntersect(_ray.orig,_ray.dir,face.v0.position,face.v1.position,face.v2.position));
}
}
RayDebugger.traceRay(_ray.orig,_ray.dir,0x228833,false);
RayDebugger.traceViewPortRect(0,0,800,600,400,300);
}
}
}
}
On Wed, May 5, 2010 at 5:59 PM, Fabrice3D <[email protected]> wrote:
>
>
> here you go...
>
> Fabrice
>
>
>
> On May 5, 2010, at 4:37 PM, devlander wrote:
>
> > Fabrice where can I get your RayDebug debug class ?
> >
> > I tried to apply the screen offset but still no success.
> >
> > Thanks
> >
> > On May 5, 3:13 pm, Michael Iv <[email protected]> wrote:
> >> That is interesting point . I wll try this . Sorry I cant see the white
> >> pixels , it is too far from the screen :)
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> On Wed, May 5, 2010 at 4:07 PM, Fabrice3D <[email protected]> wrote:
> >>> I think I may know why you miss....
> >>> in demo I have offseted the screen, because coordinates flash are top
> left.
> >>> pixel = _view.camera.unproject(startx-400, starty+j-300);
> >>
> >>> here 400 and 300 being hardcoded as 1/2 values of my screen 800x600
> >>
> >>> Fabrice
> >>
> >>> On May 5, 2010, at 3:01 PM, Michael Iv wrote:
> >>
> >>> I am quite sure that the ray class casts the ray in right direction ,
> but
> >>> the problem that I could not understand was why no intersection was
> returned
> >>> .
> >>> In your example do you receive the intersection of these rays with the
> >>> globe ?
> >>
> >>> On Wed, May 5, 2010 at 3:51 PM, Fabrice3D <[email protected]> wrote:
> >>
> >>>> made little demo to show you thats this is probably what is going on
> in
> >>>> your code.
> >>
> >>>> --> this demo projects a stroke 8 px wide in center screen (800x600),
> in
> >>>> this case at 0,0 to 0,400 x/y
> >>>> the ray debugger shows you the camera, viewport, and the stroke.
> >>>> the debug rays are using the unproject camera method. (debug rays
> >>>> projected each 20 pixels only first column to stay friend with the
> flash
> >>>> player)
> >>>> as you can see the direction obtained once normalized, is what you
> want.
> >>>> And also shows Ray class is not wrong.
> >>
> >>>> Now, the sphere in the world is still object space. not having any of
> the
> >>>> camera perpective.
> >>>> Changing camera after calcs to hovercam to explore, you can see the
> debug
> >>>> trace shows that once you put yourself behind the camera
> >>>> that the result of the stroke does match the rays using the Ray class
> >>>> where no perpective or lens corrections are applied.
> >>>> except its obvious that the rays do not fit the image where the white
> (the
> >>>> hit) should be way smaller if in same space as camera
> >>
> >>>> http://www.closier.nl/playground/RaySpace.swf
> >>
> >>>> Again, I'll try improve that class to make it smarter.. its all a
> question
> >>>> of time :)
> >>
> >>>> Fabrice
> >>
> >>>> On May 5, 2010, at 1:09 PM, Michael Iv wrote:
> >>
> >>>> I was looking at the following function in BitmapMaterial Class:
> >>>> if(showNormals){
> >>
> >>>> _nn.rotate(tri.faceVO.face.normal,
> >>>> tri.view.cameraVarsStore.viewTransformDictionary[tri.source]);
> >>
> >>>> _sv0x = (tri.v0x + tri.v1x + tri.v2x) / 3;
> >>>> _sv0y = (tri.v0y + tri.v1y + tri.v2y) / 3;
> >>
> >>>> _sv1x = (_sv0x - (30*_nn.x));
> >>>> _sv1y = (_sv0y - (30*_nn.y));
> >>
> >>>> _session.renderLine(_sv0x, _sv0y, _sv1x, _sv1y, 0,
> >>>> 0xFF00FF, 1);
> >>>> }
> >>>> }
> >>
> >>>> And I can see ( if I am right) that you are setting _nn roation
> >>>> multiplying face normal by face matrix that was received from camera
> space
> >>>> .
> >>>> May be that is what has to be done when getting faces for
> getIntersection
> >>>> ?
> >>
> >>>> On Tue, May 4, 2010 at 12:11 PM, devlander <[email protected]
> >wrote:
> >>
> >>>>> ok Fabrice.
> >>>>> Please notify us if you can get something working ( this is a
> critical
> >>>>> feature for my project ).
> >>
> >>>>> Thanks for your support.
> >>
> >>>>> On May 4, 9:44 am, Fabrice3D <[email protected]> wrote:
> >>>>>> Looking at it asap as I need it as well...
> >>
> >>>>>> On May 4, 2010, at 7:18 AM, Michael Iv wrote:
> >>
> >>>>>>> Now I can see I am not only one having that problem
> >>
> >>>>>>> Sent from my iPhone
> >>
> >>>>>>> On May 4, 2010, at 3:49 AM, devlander <[email protected]>
> >>>>> wrote:
> >>
> >>>>>>>> =================================================================
> >>>>>>>> Please forget about my previous post (many copy&past mistakes in
> the
> >>>>>>>> code snippet)
> >>>>>>>> =================================================================
> >>
> >>>>>>>> Here is my code (corrected):
> >>
> >>>>>>>> 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);
> >>
> >>>>>>>> var rayDir:Number3D = new Number3D();
> >>>>>>>> rayDir.x = rayPos.x;
> >>>>>>>> rayDir.y = rayPos.y;
> >>>>>>>> rayDir.z = rayPos.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.v1.position [in global world coord system]
> >>>>>>>> v2: face.v2.position [in global world coord system]
> >>
> >>>>>>>> Thanks for any help on this.
> >>
> >>>>>>>> On May 4, 2:33 am, devlander <[email protected]> wrote:
> >>>>>>>>> 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
> >>
> >> ...
> >>
> >> read more ยป
>
>
--
Michael Ivanov ,Programmer
Neurotech Solutions Ltd.
Flex|Air |3D|Unity|
www.neurotechresearch.com
http://blog.alladvanced.net
http://www.meetup.com/GO3D-Games-Opensource-3D/
Tel:054-4962254
[email protected]
[email protected]
