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sstjroberts

two sided textured polygons

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I want to display a fragment with a modulated texture on the front face and a filled back surface with constant colour (ie no texture). Both sides ought to be lit. How do I prevent the texture from being rendered on the front and back? Do I have to render the fragment in two passes or can it be achieved in one pass?

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One way to do it is to check if the polygon is facing you or not facing you (check the normal angle against where you are pointing). Depending on the result, you can use a different texture map. 1 polygon, 2 maps.

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