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Improved performance of PosterMaskBBlend by not evaluating a second material when only one material will ever contribute to the result.
Added a new pass-through material for use with blends, PassThroughMaterial..
Changed test settings.
Added a 3d sine wave texture, SineWaveTexture3D.
Added a circular 3d sine wave texture, CircularSineWaveTexture3D.
Added a spherical 3d sine wave texture, SphericalSineWaveTexture3D.
Added an additive unary blend for Materials.
Added a multiplicative unary blend for Materials.
Added a subtractive unary blend for Materials.