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jdavis

OpenGL OpenGL blending issue

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I'm trying to pull off simple alpha blending but I'm getting strange results.. glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA); glColor4f(1.0f, 1.0f, 1.0f, m_fAlpha); If I decrement m_fAlpha, when it goes below 0.7'ish it stops fading and it looks almost as if it's doing some sort of additive blending. Anyone have any ideas?

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You get additive blending because it is an additive blending function. If you want interpolation, you need to replace first blending factor with GL_SRC_ALPHA.

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