Transforming between World coordinates and Pixels |
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gglMatrixgglMatrix provides translation from Pixels to OpenGL world coordinates. It links the ModelView and Projection matrices and the ViewPort so you don't have to. This is a replacement for gluProject and gluUnProject if you don't want to have to distribute glu. |
Once you've set the ViewPort,Projection and ModelView, you can do things like this:
GLdouble x,y,z; gglMatrix Tx; CPoint Pixel(2,3); Tx.Pixel2World(Pixel, x,y,z); ... Tx.World2Pixel(x,y,z, Pixel);It should be fairly quick to do many translations because the time-consuming bit is in the constructor which calls SetFromGL(). Optimising compilers can potentially run this sort of matrix code in parallel.
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