Texture Generators

	TextureFile: Loads a texture from a .bmp file. Even if the operator is run multiple times, the texture is only loaded once.
	RoughTextureGenerator: Creates a texture procedurally by choosing texels between minimum and maximum values
	ProceduralTextureGenerator: Creates an RGB texture by evaluating red, green and blue formulas for each texel.
	TransparentTextureGenerator: Creates an RGBA texture by evaluating red, green, blue and alpha formaulas for each texel.