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  Difficulties trying to get the pick position from projection and view matrix  (Read 337 times)
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Offline Nouht

Senior Newbie





« Posted 2013-11-24 20:39:09 »

Hello there. I am trying to get the pick position in terms of a vector3 from the projection and view matrix. I am using my own math classes. I don't think this is right, could you give any suggestions on how to fix this?

   private Vec3 getPick(Mat4 projection, Mat4 view) {
      Mat4 inverseProject = projection.copy().inverse();
      Mat4 pick = inverseProject.mul(view.copy());
      Vec3 pos = new Vec3(pick.m10, pick.m11, pick.m12);
      return pos;
   }

Cheers.
Offline RobinB

JGO Ninja


Medals: 44
Projects: 1
Exp: 3 years


Spacegame in progress


« Reply #1 - Posted 2013-11-24 20:51:18 »

Almost right.
If you want to get only the movement of a matrix you just do this:

1  
2  
3  
    public float getMoveX(){ return m03; }
    public float getMoveY(){ return m13; }
    public float getMoveZ(){ return m23; }


I dont know where you would need this for, but it does what you describe.
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