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update shadow maps to use exponential functions

Ken Martin requested to merge ken-martin/vtk:updated_shadow_maps into master

This topic changes the shadow map passes in VTK to use an exponential function which behaves a bit better and is faster.

also fix a bug where for directional lights the parallel scale was double what it should be.

Also add in the capability to support subsurface scattering by compouting a thickness value in the lighting calc.

Edited by Ken Martin

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