diff --git a/Source/Shaders/Collisions.hlsl b/Source/Shaders/Collisions.hlsl
index e68871e27..4ac81b4aa 100644
--- a/Source/Shaders/Collisions.hlsl
+++ b/Source/Shaders/Collisions.hlsl
@@ -18,4 +18,21 @@ bool RayHitRect(float3 r, float3 rectCenter, float3 rectX, float3 rectY, float3
 	return inExtentX && inExtentY;
 }
 
+// Hits axis-aligned box (boxMin, boxMax) with a line (lineStart, lineEnd).
+// Returns the intersections on the line (x - closest, y - furthest).
+// Line hits the box if: intersections.x < intersections.y.
+// Hit point is: hitPoint = lineStart + (lineEnd - lineStart) * intersections.x/y.
+float2 LineHitBox(float3 lineStart, float3 lineEnd, float3 boxMin, float3 boxMax)
+{
+	float3 invDirection = 1.0f / (lineEnd - lineStart);
+	float3 enterIntersection = (boxMin - lineStart) * invDirection;
+	float3 exitIntersection = (boxMax - lineStart) * invDirection;
+	float3 minIntersections = min(enterIntersection, exitIntersection);
+	float3 maxIntersections = max(enterIntersection, exitIntersection);
+	float2 intersections;
+	intersections.x = max(minIntersections.x, max(minIntersections.y, minIntersections.z));
+	intersections.y = min(maxIntersections.x, min(maxIntersections.y, maxIntersections.z));
+	return saturate(intersections);
+}
+
 #endif