glBlendFunc

Started by gus November 17, 2001 09:00 PM

1 comment, last by gus 23 years, 3 months ago

Author

122

November 17, 2001 09:00 PM

How do I set glBlendFunc if I want a polygon to be completely visible if alpha = 1.0 and completely transparent if alpha = 0.0 ? thanks

Fruny

1,658

November 17, 2001 09:17 PM

The "common" setting for glBlendFunc() is

glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );

You then have to render the polygons from back to front.

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan

Null and Void

1,088

November 17, 2001 09:48 PM

You can almost do that using alpha testing:

  gEnable(GL_ALPHA_TEST);glAlphaFunc(GL_GREATER,0.0f);// RenderglDisable(GL_ALPHA_TEST);

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glBlendFunc

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