From ba65e6b122034efb1a2928e5e5b62fd1779b08e3 Mon Sep 17 00:00:00 2001
From: ChenX <maple6@vip.qq.com>
Date: Mon, 16 Aug 2021 10:12:08 +0800
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---
 src/Common/InterfereUtil.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Common/InterfereUtil.ts b/src/Common/InterfereUtil.ts
index 033908dbe..caecab564 100644
--- a/src/Common/InterfereUtil.ts
+++ b/src/Common/InterfereUtil.ts
@@ -146,6 +146,9 @@ export class CheckInterfereTool
                     let [b1, b2] = [t1 === 1 ? <ExtrudeSolid>e1.Clone() : (<ExtrudeHole>e1).Convert2ExtrudeSolid(),
                     t2 === 1 ? <ExtrudeSolid>e2.Clone() : (<ExtrudeHole>e2).Convert2ExtrudeSolid()];
 
+                    b1.ClearDraw();
+                    b2.ClearDraw();
+
                     if (!b1.Subtract([b2], []) && !b1.IsErase
                         && !b2.Subtract([b1], []) && !b2.IsErase)
                         continue;