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  problem on picking point with JOGL  (Read 767 times)
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Offline nkint

Innocent Bystander





« Posted 2010-12-22 19:09:38 »

hi guys
i need to pick some point on the JOGL canvas
with gluUnproject.

i'm totally new with opengl.

first, reshape method:
               
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gl.glViewport(0, 0, width, height);
      gl.glMatrixMode(GL.GL_PROJECTION);
      gl.glLoadIdentity();
      glu.gluPerspective(45.0f, h, 1.0, 20.0);
      gl.glMatrixMode(GL.GL_MODELVIEW);
      gl.glLoadIdentity();


display:
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               gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
      gl.glLoadIdentity();
     
      gl.glPushMatrix();
      gl.glTranslatef(-1.5f, 0.0f, -6.0f); // WHY THIS???
     draw(gl);
     
      if(detect)performSelection(gl);
     
      gl.glPopMatrix();
      gl.glFlush();


in draw.. i draw the point Vector3D x0: (0.6, 1, 2)

and performSelection is:

take the eye's point
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glu.gluUnProject(width/2, height/2, 0, 
            mvmatrix, 0, projmatrix, 0, viewport, 0, wcoord, 0);
        //System.out.println("World coords at z=0.0 are ( "+ wcoord[0] + ", " + wcoord[1] + ", " + wcoord[2]+ ")");

        Vector3D x1 = new Vector3D(wcoord[0], wcoord[1], wcoord[2]);  


take the mouse point on my near plane:
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glu.gluUnProject( x,  realy, 1, //
           mvmatrix, 0, projmatrix, 0, viewport, 0, wcoord, 0);
        //System.out.println("World coords at z=1.0 are ("+ wcoord[0] + ", " + wcoord[1] + ", " + wcoord[2]+ ")");
       Vector3D x2 = new Vector3D(wcoord[0], wcoord[1], wcoord[2]);


make the line between x1 and x2
and do the distance between line and x0.

now, my problem is that it doesn't work.. if i mouve the mouse on the point distance is 0.2, and if i move the mouse on the bottom left cornet is 3, ok.
but if i move the mouse on the bottom (different y) but aligned with point x..
i get 0.2 too.

why??
can you help me?
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