World Ray problem

[KingSnail]

Code: Select all

                        D3DXVECTOR3 v;
         D3DXMATRIX matProj = GetCamera().proj(); //Projection matrix
         v.x =  ( ( ( 2.0f * sx ) / ClientWidth  ) - 1 ) / matProj._11;
         v.y = -( ( ( 2.0f * sy ) / ClientHeight ) - 1 ) / matProj._22;
         v.z =  1.0f;

         D3DXMATRIX m;
         D3DXVECTOR3 rayOrigin,rayDir;

         D3DXMatrixInverse(&m, NULL, &Renderer.V);

         // Transform the screen space pick ray into 3D space
         rayDir.x  = v.x*m._11 + v.y*m._21 + v.z*m._31;
         rayDir.y  = v.x*m._12 + v.y*m._22 + v.z*m._32;
         rayDir.z  = v.x*m._13 + v.y*m._23 + v.z*m._33;
         rayOrigin.x = m._41;
         rayOrigin.y = m._42;
         rayOrigin.z = m._43;

         NewtonWorldRayCast(World, &rayOrigin[0], &rayDir[0], RayCastFilter, NULL, RayCastPrefilter);


I cant get the ray cast to work properly, Is the way I did it correct?
Right now it selects the objects in a place where its not meant to be, and detects more more then one where theres clearly only one object, or nothing at all (towards middle of the world)

Please help

[KingSnail]

I am still struggling with this problem, hes some more info:

Code: Select all

+      _D3DVECTOR   {x=-0.65088683 y=-0.73363835 z=0.19524600 }   _D3DVECTOR //Ray direction
+      _D3DVECTOR   {x=158.53841 y=68.788170 z=10.339884 }   _D3DVECTOR //Ray Origin
+      _D3DVECTOR   {x=158.53841 y=68.788162 z=10.339886 }   _D3DVECTOR //Camera Pos


I want to send a ray from middle of screen which is 1920 / 2 width and 1200 / 2 height.
It ends up with those values above. The code I use is in the post above.

Please could someone have a look for me and try to identify why the ray is having strange problems as described in previous post.
Thanks

[adam450]

When I first tested bullet rays, I had a camera, when I hit space, it captured the ray start and end. Then I could move around and see if that ray way correct. Make sure it draws right through the center of what you saw.