about function1D

[JackKaiXing]

In file, /master/include/luxrays/utils/mcdistribution.h, line 64, return func[off1] * (1.f - d) * func[off2] * d; should be + instead of *.

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[JackKaiXing]

return func[off1] * (1.f - d) + func[off2] * d;