1 files changed, 1 insertions, 1 deletions
diff --git a/vec.h b/vec.h
index 13e87b5..99f5f46 100644
--- a/vec.h
+++ b/vec.h
@@ -215,7 +215,7 @@ public:
 
     // Get a random real number in range [0, 1].
     inline T range01_scalar() {
-        return uni(mt);
+        return std::abs(uni(mt));
     };
 
     // Get a unit vector with random direction.