glBlendFunc | GameDev.net

Original Post

Nov 17, 2001 at 9:00 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

Nov 17, 2001 at 9:17 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.

Null and Void

Nov 17, 2001 at 9:48 PM

You can almost do that using alpha testing:

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

// Render


glDisable(GL_ALPHA_TEST);

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