iPhone OpenGL ES - How to Pick

Posted by Ali Nadalizadeh on Stack Overflow See other posts from Stack Overflow or by Ali Nadalizadeh
Published on 2010-03-29T18:52:46Z Indexed on 2010/04/01 8:03 UTC
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Filed under:

iphone

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opengl-es

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touch

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matrix

I'm working on an OpenGL ES1 app which displays a 2D grid and allows user to navigate and scale/rotate it. I need to know the exact translation of View Touch coordinates into my opengl world and grid cell. Are there any helpers to do the reverse of last few transforms which I do for navigation ? or I should calculate and do the matrix stuff by hand ?

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