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I want to draw a texture on the line that user draws on the screen. Like a mouse trail, so I follow this tutorial. . The only thing that doesn't answer me is sending the custom uv to the shaders. I vaguely remember that in C++, I can create struct or something and the shader will know how to handle it. It seems that is not the case here. I can't even figure out how does "index" property in vertex shader gets there. Even so, I can't use the "index" approach as the line won't be full rectangle as in the example. Right now, I copied & pasted the entire lines2d classes and try to customize to be able to draw texture on there, but I don't know how to send the custom uv that I've calculated to the shader. Anyone can explain that to me? Or am I looking at this a wrong way?