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parallel projection and perspective projections

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I need help with parallel projections and perspective projections, this is what I have so far:

Vertex List

v X Y Z
v X Y Z

and Face List

f V1 V2 V3
f V3 V2 V1

I have a java application that reads in a vertex list and face list. I also have code to write 2-D lines and ouput that image file. In my code I have the standard 3D default values defined for: PRP and VRP reference points, VPN and VUP vectors, and VRC window coordinates.

What I need help with is understanding the algorithms of the parallel and perspective projection. I looked up the general theory of the matrix translations of these projections; however I have no text book or guide on the topic (and am completely new to graphics). So I really do not know where/how to get started. I do not need code; I need something that would help me understand these projections and how these projections will help me take a vertex list/face list and translate that data in 2D lines. If I can understand the concepts I am pretty confident that I can code it.

Thank you for your assistance.

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Help with parallel projection and perspective projections is provided.

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