4.20.3 Fix for broken Backlit property in Hair shader

Development Rendering
2

Just wanted to add this is to prevalent in 4.25.1

The fix still works, however the should be updated to:


Lighting.Transmission = AreaLight.FalloffColor * Falloff * HairShading( GBuffer, L, V, N, Shadow.TransmissionShadow, Shadow.HairTransmittance, GBuffer.CustomData.z, 0, uint2(0,0), bEvalMultiScatter);

Note, the new **Shadow.HairTransmittance **parameter. The goal of the fix is still to replace, the constant 1 value.