two sided textured polygons

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Started by sstjroberts June 25, 2001 09:39 PM

1 comment, last by sstjroberts 22 years, 10 months ago

122

Author

June 25, 2001 09:39 PM

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?

Obelix

122

June 26, 2001 10:56 AM

I think that you have to use two polygons and backface culling.

Developer101

122

June 28, 2001 12:36 AM

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.