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5.2, 6.0, 6.1 or later
Linux, Mac, Windows
This is a fast (FFT-based) approximation of brute force environment map convolution a la HDR Shop, using a Phong BRDF. The output image is seamless and can be diffuse or specular. The input image should be in latlong space.
A typical brute force convolution will apply the BRDF oriented at each pixel and then do a weighted sum of the result. This gizmo is simply applying an FFT Convolve in angular map space using a Phong BRDF as the kernel but it's only doing it in +Z and -Z directions then blending them together.
For a pure diffuse surface set the exponent to 1. For a glossy to highly specular surface set it higher.
v1.1 - Improved blending a bit and got rid of the size knob. The output res is now determined by the input res.
v1.2 - Added a CopyBBox to make sure the outgoing bounding box matches the input.
v1.3 - Correctly deals with proxy mode.
v1.4 - Another proxy mode fix...