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Create shadow_vec for altering shadow computation · b8358680azagaya authored
In 2.1 and 3.0, light_vec could be modified for altering shadow_computations. But it broke shadows when rotating light. shadow_vec would do the same, but without breaking shadows in rotated lights if not used. Add inverse light transformation to shadow vec, so it's not affected when rotating lights; Added usage define for shadow vec. For shadow vec working properly when rotating a light, it's needed to multiply it by light_matrix normalized. Added usage define in order to don't do that if shadow_vec not used.
b8358680
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