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mrwiggle

get xy coordinate from xyz

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mrwiggle    122
anyone know of a simple way to calculate the actual pixel coordinate (based on window dimensions) of a "3D" opengl coordinate. . .? Thanks!

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Tree Penguin    262
Project a vertex with the modelview matrix, and then with the perspective matrix and you'll have the pixel coordinate. To get the matrices use glGetMatrix and for the use of matrices check out this article.

EDIT: i am not really sure the perspective matrix also handles the pixel coordinates, does anyone know? Thanks

[edited by - Tree Penguin on March 24, 2004 6:41:39 AM]

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