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Fast and large radius blur

Results 2 ofxIterativeBoxBlur issues
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trying to blur a large horizontal image i saw the blur not really square. I think the code should be something like this to fix: ``` blur_shader.setUniform2f("direction", 1. / pingpong[index].front->getWidth(),...

Hi, @satoruhiga can you share your ```"ofMain.h"```?