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Sets a global float property for all shaders.
Global properties are used if a shader needs them but the material does
not have them defined (for example, if the shader does not expose them
Usually this is used if you have a set of custom shaders that all use the same "global" float (for example, density of some custom fog type). Then you can set the global property from script and don't have to setup the same float in all materials.
See Also: SetGlobalColor, SetGlobalTexture; Material class, ShaderLab documentation.