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The clamp(v,a,b) function wraps v around the interval [a,b). However prior to this commit, `clamp` was ignoring the third argument and using the second argument again in its place. This resulted in a division by zero. Hence `clamp` didn't work at all. Even if the arguments were treated correctly, `clamp` incorrectly multiplied rather than added whenever v < a. This would have produced bogus results. (Thanks to Shona McNeill for pointing this out.) Note that as implemented, `clamp` is undefined for b >= a. These errors are present in the last upstream C version, v2.7. They've been corrected in the C++ version that upstream now maintains instead. Thanks-to: Shona McNeill <prufrax@googlemail.com> FS-7070 #resolve