diff --git a/ArchitectureColoredPainting/BvhTree.cpp b/ArchitectureColoredPainting/BvhTree.cpp
index e537e29..907ee25 100644
--- a/ArchitectureColoredPainting/BvhTree.cpp
+++ b/ArchitectureColoredPainting/BvhTree.cpp
@@ -20,7 +20,7 @@ QVector4D BvhTree::Union(QVector4D a, QVector4D b) {
 
 QVector4D BvhTree::calcBound(QVector4D initBound[], int l, int r) {
 	QVector4D res = initBound[l];
-	for (int i = l + 1; i < r; i++) {
+	for (int i = l + 1; i <= r; i++) {
 		res = Union(res, initBound[i]);
 	}
 	return res;
@@ -34,9 +34,9 @@ bvhPtr BvhTree::subBvhTree(QVector4D initBound[], int l, int r) {
 	if (l == r) return p;
 	int dim = p.get()->maximumBound();
 	if (dim == 0) {
-		std::sort(initBound + l, initBound + r, BvhNode::x_compare);
+		std::sort(initBound + l, initBound + r+1, BvhNode::x_compare);
 	} else {
-		std::sort(initBound + l, initBound + r, BvhNode::y_compare);
+		std::sort(initBound + l, initBound + r+1, BvhNode::y_compare);
 	}
 	int mid = (l + r) >> 1;
 	p.get()->child[0] = subBvhTree(initBound, l, mid);