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-rw-r--r--lib/maths.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/maths.cpp b/lib/maths.cpp
index 5430ef6..0c25820 100644
--- a/lib/maths.cpp
+++ b/lib/maths.cpp
@@ -9,7 +9,7 @@ glm::mat4
flat_orientation(const Direction3D & diff)
{
static const auto oneeighty {glm::rotate(pi, up)};
- const auto flatdiff {glm::normalize(!!diff)};
+ const auto flatdiff {glm::normalize(diff.xy() ^ 0.F)};
auto e {glm::orientation(flatdiff, north)};
// Handle if diff is exactly opposite to north
return (std::isnan(e[0][0])) ? oneeighty : e;