Is anyone know how to implement ImportanceSampling to the cubemap?

@11110 wrote:

Is anyone know how to implement ImportanceSampling to the cubemap? since monogame not support geometry shader at this moment.

here is some reference, but it require geometry shader.
* https://github.com/derkreature/IBLBaker/blob/master/data/shadersD3D11/IblImportanceSamplingDiffuse.fx
* http://http.developer.nvidia.com/GPUGems3/gpugems3_ch20.html

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