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In master, since we have raised the minimum Imath/OpenEXR to 3.x, no more 2.x, we no longer need generate our Imath.h and half.h from templates, they can be turned into regular header files.
Additionally, define IMATH_HALF_NO_LOOKUP_TABLE in half.h before including Imath/half.h, which ensures that the Imath code we include converts float <-> half using actual inline code and not the lookup table. This can reduce or sometimes eliminate the need to link agains Imath only for the sake of accessing that lookup table.