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3D to 2D coordinates

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  1. static void __gluMultMatrixVecd(const GLdouble matrix[16], const GLdouble in[4],
  2. 		      GLdouble out[4])
  3. {
  4.     int i;
  5.  
  6.     for (i=0; i<4; i++) {
  7. 	out[i] = 
  8. 	    in[0] * matrix[0*4+i] +
  9. 	    in[1] * matrix[1*4+i] +
  10. 	    in[2] * matrix[2*4+i] +
  11. 	    in[3] * matrix[3*4+i];
  12.     }
  13. }
  14.  
  15. GLint GLAPIENTRY
  16. gluProject(GLdouble objx, GLdouble objy, GLdouble objz, 
  17. 	      const GLdouble modelMatrix[16], 
  18. 	      const GLdouble projMatrix[16],
  19.               const GLint viewport[4],
  20. 	      GLdouble *winx, GLdouble *winy, GLdouble *winz)
  21. {
  22.     double in[4];
  23.     double out[4];
  24.  
  25.     in[0]=objx;
  26.     in[1]=objy;
  27.     in[2]=objz;
  28.     in[3]=1.0;
  29.     __gluMultMatrixVecd(modelMatrix, in, out);
  30.     __gluMultMatrixVecd(projMatrix, out, in);
  31.     if (in[3] == 0.0) return(GL_FALSE);
  32.     in[0] /= in[3];
  33.     in[1] /= in[3];
  34.     in[2] /= in[3];
  35.     /* Map x, y and z to range 0-1 */
  36.     in[0] = in[0] * 0.5 + 0.5;
  37.     in[1] = in[1] * 0.5 + 0.5;
  38.     in[2] = in[2] * 0.5 + 0.5;
  39.  
  40.     /* Map x,y to viewport */
  41.     in[0] = in[0] * viewport[2] + viewport[0];
  42.     in[1] = in[1] * viewport[3] + viewport[1];
  43.  
  44.     *winx=in[0];
  45.     *winy=in[1];
  46.     *winz=in[2];
  47.     return(GL_TRUE);
  48. }

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