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I can't give you a "better" approach here, but I think that the approach to project each individual brush image onto the surface of the object is not really a performance issue if you implement that using the GPU. Especially in an editor environment, where not much is going on in comparison to a computer game. All you basically want to do is to ...


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As long as no pixel on the texture is used twice, you can render the geometry and display the uv-coordinates (texture coordinates). Usually they are a combination of red and green (2d). When using a brush, you only need to read out the uv-coordinates you've hit and color the texture at position (uv) in the desired color. Hint: paint onto a second texture, so ...


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You could do it in different ways. But the most logical way for me is that there are points sampled along the path, then splines/benzier curves are used to make it smooth (additonal points can be interpolated), thereafter it is projected and saved on the texture. So no "every" point has to be sampled.


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