projection Transformation

Graphics and GPU Programming Programming

Started by jho July 06, 2000 11:12 AM

2 comments, last by jho 23 years, 10 months ago

122

Author

July 06, 2000 11:12 AM

hi, can someone please point me out to a URL where they teach you how to transform a 3D point XYZ into screen XY.. Basically I''m trying to write a camera routine...

bosco

122

July 06, 2000 02:21 PM

Hey,

you talking about the actual math involved independent of software or what? If you''re using OpenGL, then I assume you have the Red Book.. if not, get it..

Also, check out http://nehe.gamedev.net for great tutorials on OpenGL related stuff..

Other than that, give me a little more detail and I''m sure I can dig something up..

bosco()

leader of the free world .. or something ..

--leader of the free world .. or something ..

jho

122

Author

July 06, 2000 02:50 PM

No.. Not openGL.. I''m talking about low level ugly stuff, like rotate the camera given VUP and VPN to align to the XYZ coordinates.. argh. I am reading foley van dam it''s a little complicated! any better source out there?

I''m trying to write a camera similar to GLuLookAt, where you give position, point of interest, and VUP. Please help before my brain explode...

jho

122

Author

July 06, 2000 05:24 PM

Hi everyone, please help me..
I decided to specify my camera using the UVN system,
where
N = Position - Point_LookAt
V = user specified, (0,1,0)..etc.
U - crossproduct(N,V)

Now, I am really not sure how to rotate this UVN system back to XYZ system.. I need to find out the negative angles of Rz Ry Rz right? Please help!

projection Transformation

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projection Transformation

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