diff --git a/ArchitectureColoredPainting/src/Renderer/Painting/BvhTree.h b/ArchitectureColoredPainting/src/Renderer/Painting/BvhTree.h
index 2748327..4abc27f 100644
--- a/ArchitectureColoredPainting/src/Renderer/Painting/BvhTree.h
+++ b/ArchitectureColoredPainting/src/Renderer/Painting/BvhTree.h
@@ -21,7 +21,7 @@ namespace Renderer
 				leftSon, rightSon);
 		}
 		QVector4D boundWithRotation() {
-			double angle = (rightSon & ((1 << 16) - 1)) * acos(-1);
+			double angle = (rightSon & ((1 << 16) - 1)) / static_cast<double>((1 << 16)) * acos(-1);
 			double px = bound.x() * cos(angle) + bound.y() * sin(angle), py = bound.y() * cos(angle) - bound.x() * sin(angle);
 			double qx = bound.z() * cos(angle) + bound.w() * sin(angle), qy = bound.w() * cos(angle) - bound.z() * sin(angle);
 			return QVector4D(