1 files changed, 15 insertions, 0 deletions

diff --git a/src/core/Collision.cpp b/src/core/Collision.cpp
index b68214af..77e28a10 100644
--- a/src/core/Collision.cpp
+++ b/src/core/Collision.cpp
@@ -1801,6 +1801,21 @@ CColSphere::Set(float radius, const CVector &center, uint8 surf, uint8 piece)
 	this->piece = piece;
 }
 
+bool
+CColSphere::IntersectRay(CVector const& from, CVector const& dir, CVector &entry, CVector &exit)
+{
+	CVector distToCenter = from - center;
+	float distToTouchSqr = distToCenter.MagnitudeSqr() - sq(radius);
+	float root1, root2;
+
+	if (!CGeneral::SolveQuadratic(1.0f, DotProduct(distToCenter, dir) * 2.f, distToTouchSqr, root1, root2))
+		return false;
+
+	entry = from + dir * root1;
+	exit = from + dir * root2;
+	return true;
+}
+
 void
 CColBox::Set(const CVector &min, const CVector &max, uint8 surf, uint8 piece)
 {