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Alex Rivera
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I am confused about perspective projection. Here is the scenario that is confusing me. My frustrum's front plane is basically positioned at at positive z-axis and the back plane at a negative axis and rotated about some deg along the posive z-axis. Now, whenever I go through examples I see that the near and the far plane are all present in the negative z axis. My approach in this case was basically something like: glMatrixMode(GL_PROJECTION); glLoadIdentity(); glFrustrum(-xval,+xval,-yval,+yval,-10,+10); gluLookAt(); // some point lying on this axis of symmetry about the point glMatrixMode(GL_MODELVIEW); So, in the above case what is the behavior that I should expect for the glFrustum with a negative as well as positive value for z. i.e. in this case -10 to +10.
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