> How do you specify the surface that you want to render on for the shader? I > can take the code from a working shader (e.g. GLSL - TorusMorph) and put it > in a new composition and it doesn't show anything. I also noticed that GLSL > - Lattice is rendered on the teapot, but I did not see any reference to the > teapot in the composition. I am sure I am missing something obvious, but I > have explored the menus and can't figure out how to specify what surface to > render the shader on.
the GLSL Shader patch is a macro - it has patches "inside" that it operates on. So in the teapot case, for example, there's a teapot "inside" the GLSL shader patch (you'll have to click the patch and press cmd-down to enter it; cmd-up will exit a macro). Double-clicking the macro will also take you inside it. > BTW, I am just learning shaders and OpenGL and was hoping that Quartz > Composer would be a good way to do this. > > My goal is to experiment with imaging algorithms using GLSL so I just need a > rectangular surface to render onto. In this case, you'll probably just want to toss a sprite or GLSL Grid into the shader macro - I personally find a track ball macro containing the shader to also be useful (so I can rotate the rectangular surface while experimenting). -- Christopher Wright [email protected]
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