Composite image:
Returned light component:
In the composite image, I'm conserving energy by subtracting out the reflected light before determining the amount of the front light that gets through the model, and then I'm subtracting out both before determining the amount of returned light. I'm also using chromatic scattering / absorption coefficients so the light shifts from the watery blue to more green.
I don't know why, but I don't like what's happening with the returned light.
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