To use the Projector/Light and Projector/Shadow shaders properly:
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Cookie texture:
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1. Make sure texture wrap mode is set to "Clamp"
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2. Turn on "Border Mipmaps" option in import settings
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3. Use uncompressed texture format
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4. Projector/Shadow also requires alpha channel to be present (typically Alpha from Grayscale option is ok)
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Falloff texture (if present):
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1. Data needs to be in alpha channel, so typically Alpha8 texture format
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2. Make sure texture wrap mode is set to "Clamp"
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3. Make sure leftmost pixel column is black; and "Border mipmaps" import setting is on.
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