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at December 25, 2008 22:19 by nesium
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static void __gluMultMatrixVecd(const GLdouble matrix[16], const GLdouble in[4], GLdouble out[4]) { int i; for (i=0; i<4; i++) { out[i] = in[0] * matrix[0*4+i] + in[1] * matrix[1*4+i] + in[2] * matrix[2*4+i] + in[3] * matrix[3*4+i]; } } GLint GLAPIENTRY gluProject(GLdouble objx, GLdouble objy, GLdouble objz, const GLdouble modelMatrix[16], const GLdouble projMatrix[16], const GLint viewport[4], GLdouble *winx, GLdouble *winy, GLdouble *winz) { double in[4]; double out[4]; in[0]=objx; in[1]=objy; in[2]=objz; in[3]=1.0; __gluMultMatrixVecd(modelMatrix, in, out); __gluMultMatrixVecd(projMatrix, out, in); if (in[3] == 0.0) return(GL_FALSE); in[0] /= in[3]; in[1] /= in[3]; in[2] /= in[3]; /* Map x, y and z to range 0-1 */ in[0] = in[0] * 0.5 + 0.5; in[1] = in[1] * 0.5 + 0.5; in[2] = in[2] * 0.5 + 0.5; /* Map x,y to viewport */ in[0] = in[0] * viewport[2] + viewport[0]; in[1] = in[1] * viewport[3] + viewport[1]; *winx=in[0]; *winy=in[1]; *winz=in[2]; return(GL_TRUE); }
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3D to 2D coordinates
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textmate
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