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This is possible using GL 1.x and here's how. So as you've found using vertex colors, a smooth transition is where it blends the two colors. This is a called a linear interpolation, or a "lerp" for short. It can be generalized to any dimension by operating on the elements of the vector individually and indeed colors are treated like a lerp in 3D -- blend R1 ...


I do not believe that this is directly possible using OpenGL 1.x. If you're using OpenGL 1.3, you can use Texture Combiners to merge two textures together in various ways, and you can even specify different sets of texture coordinates for the two textures, but I do not believe it's possible to set different opacities for the different textures per vertex ...

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