Open GL Question:

What is the set of operations that are needed to perform to display a 3d representation over 2d screen?
Name the major stages of vertex transformations.
Name & give syntax of general purpose transformation commands.
Explain viewing & modeling transformations briefly.
What is projection transformation? Give difference between perspective & orthographic projections.
What do you understand by color perception?
What is difference between color index mode & RGBA mode?
How do we specify color of a geometrical object in both RGBA & color index mode?
What is a shading model? Why we need it? List shading models that are available in OpenGL.
What do you understand by hidden surface removal? Name few of algorithms used for the same.