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-rw-r--r--Build/source/utils/asymptote/triple.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/triple.h b/Build/source/utils/asymptote/triple.h
index e1ea5a41e4d..a4b1b3739cf 100644
--- a/Build/source/utils/asymptote/triple.h
+++ b/Build/source/utils/asymptote/triple.h
@@ -178,6 +178,12 @@ public:
triple expi(double theta, double phi);
+// Return the component of vector v perpendicular to a unit vector u.
+inline triple perp(triple v, triple u)
+{
+ return v-dot(v,u)*u;
+}
+
} //namespace camp
GC_DECLARE_PTRFREE(camp::triple);