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-rw-r--r--compat/simple-mat.hpp8
1 files changed, 7 insertions, 1 deletions
diff --git a/compat/simple-mat.hpp b/compat/simple-mat.hpp
index 9490473a..a909e40b 100644
--- a/compat/simple-mat.hpp
+++ b/compat/simple-mat.hpp
@@ -107,6 +107,7 @@ public:
template<int P = h_, int Q = w_> typename std::enable_if<maybe_add_swizzle<P, Q, 4>::value, num&>::type
w() { OPENTRACK_ASSERT_SWIZZLE; return operator()(3); }
+
// parameters w_ and h_ are rebound so that SFINAE occurs
// removing them causes a compile-time error -sh 20150811
@@ -116,7 +117,12 @@ public:
{
static_assert(P == h_ && Q == w_, "");
- return std::sqrt(dot(*this));
+ const num val = dot(*this);
+
+ if (std::fabs(val) < 1e-4)
+ return num(0);
+ else
+ return std::sqrt(val);
}
template<int R, int S, int P = h_, int Q = w_>