Re: (not?) using preservingMatrix
jamin1001 <[email protected]>
| Newsgroups | gmane.comp.lang.haskell.hopengl |
|---|---|
| Message-ID | <[email protected]> |
Thank you very much. I appreciate the detailed response and extra tips! Jamin Sebastian Sylvan wrote: > > On 1/5/07, jamin1001 <[email protected]> wrote: >> >> My last post was eaten by this "Nabble Forums" web page! >> >> ... >> >> 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 > _______________________________________________ > HOpenGL mailing list > [email protected] > http://www.haskell.org/mailman/listinfo/hopengl > > -- View this message in context: http://www.nabble.com/%28not-%29-using-preservingMatrix-tf2926697.html#a8186202 Sent from the Haskell - HOpenGL mailing list archive at Nabble.com.