Surface shader
renders both front and back of surface using different textures and lighting for each side.
The shaders are for either Opaque or Transparent and either simple Lambert (diffuse) or Specular lighting including reflection. Supports reflection probes and cutout shadows.
Supports back over front face Z clipping when using image alpha.
All shaders run on both shader 3.0 (single pass) and below shader 3.0 (two pass).
Also suitable for mobile Android 4.4 and above.
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