On 1/5/07, jamin1001
My last post was eaten by this "Nabble Forums" web page!
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Ah, you're right. What didn't compile for me was this additional line after the preservingMatrix call: putStr $ "Result matrix: " ++ (show rs) ++ "\n"
Instead, I want to return that value to use outside the call. This is what I was after, I think:
rs2 <- preservingMatrix $ do loadIdentity -- do whatever you want with your your matrix rs <- get ((matrix $ Just $ Modelview 0)::StateVar(GLmatrix GLdouble)) return (rs) putStr $ "Result matrix: " ++ (show rs2) ++ "\n"
Now, as for question #2, are there any pre-made ways to transform a vector with a matrix, or do I have to do it by hand (same goes for cross product!)
Not with OpenGL. If you go to the haskell.org website and check out the libraries page I'm sure you'll find plenty of linear algebra libraries. This is a problem that you have to face in any language, btw, at least any language which doesn't include linear algebra operations. Oh, and also do bar xs <- foo return xs is equal to do bar foo I'e you can loose the arrow and the "return". /S -- Sebastian Sylvan +46(0)736-818655 UIN: 44640862