better edge case handling

src/blitz/maths/Physics.cpp

@@ -49,11 +49,11 @@ float Distance(const Ray& ray, const AABB& aabb) {
 	// (as a result of 0.0 / 0.0). If all coordinates are NAN, this means
 	// that the box is reduced to a point and the ray has direction 0,
 	// in which case this returns -1
-	if (tmax < 0.0f || tmin > tmax) {
-		return -1.0f;
+	if (tmax >= 0.0f && tmin <= tmax) {
+		return std::fmaxf(tmin, 0.0f);
 	}
 
-	return std::fmaxf(tmin, 0.0f);
+	return -1.0f;
 }
 
 bool Intersects(const Ray& ray, const AABB& aabb) {