Caustics on subsurface materials?

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DeepSpaceBanana interpolator
So i've been creating a sort of icy cave with pools of water etc.. And i've run into a snag when creating caustics, so im basically trying to use a light function to create the effect but what i've noticed is that the function doesn't work properly when i place the light near rocks that are using a subsurface lighting model. It works fine when i use it alongside objects with the default lighting model but not with subsurface? I'm assuming that this is because of the way the subsurface model works with light. But does anybody have any workarounds for this? A way to achieve caustics on a subsurface material?


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