From f7d8cebdee0fe5613eb4f6b9b82244fc8105034a Mon Sep 17 00:00:00 2001
From: nwwolf <lclxyz@qq.com>
Date: Tue, 20 Aug 2024 05:12:09 +0800
Subject: [PATCH] bug fix at AddPerpPlaneQuadric (#6911)

---
 cpp/open3d/geometry/TriangleMeshSimplification.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cpp/open3d/geometry/TriangleMeshSimplification.cpp b/cpp/open3d/geometry/TriangleMeshSimplification.cpp
index 90a2a166ce7..081d0842a2c 100644
--- a/cpp/open3d/geometry/TriangleMeshSimplification.cpp
+++ b/cpp/open3d/geometry/TriangleMeshSimplification.cpp
@@ -298,7 +298,8 @@ std::shared_ptr<TriangleMesh> TriangleMesh::SimplifyQuadricDecimation(
         const auto& vert1 = mesh->vertices_[vidx1];
         const auto& vert2 = mesh->vertices_[vidx2];
         Eigen::Vector3d vert2p = (vert2 - vert0).cross(vert2 - vert1);
-        Eigen::Vector4d plane = ComputeTrianglePlane(vert0, vert1, vert2p);
+        Eigen::Vector4d plane =
+                ComputeTrianglePlane(vert0, vert1, vert0 + vert2p);
         Quadric quad(plane, area * boundary_weight);
         Qs[vidx0] += quad;
         Qs[vidx1] += quad;