From ff6623b0f47cc8d47f7335c1de9f9eeba96afd45 Mon Sep 17 00:00:00 2001
From: Vojtech Bubnik <bubnikv@gmail.com>
Date: Wed, 19 May 2021 16:51:25 +0200
Subject: [PATCH] Fixing

---
 src/libslic3r/TriangleMesh.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libslic3r/TriangleMesh.cpp b/src/libslic3r/TriangleMesh.cpp
index 5e18e43ef..c81f9066e 100644
--- a/src/libslic3r/TriangleMesh.cpp
+++ b/src/libslic3r/TriangleMesh.cpp
@@ -911,8 +911,8 @@ void its_collect_mesh_projection_points_above(const indexed_triangle_set &its, c
             const Vec3f &p2 = pts[iedge];
             if ((p1.z() < z && p2.z() > z) || (p2.z() < z && p1.z() > z)) {
                 // Edge crosses the z plane. Calculate intersection point with the plane.
-                float t = z / (p2.z() - p1.z());
-                all_pts.emplace_back(scaled<coord_t>(p1.x() + (p2.x() - p1.x()) * t), scaled<coord_t>(p2.x() + (p2.y() - p2.y()) * t));
+                float t = (z - p1.z()) / (p2.z() - p1.z());
+                all_pts.emplace_back(scaled<coord_t>(p1.x() + (p2.x() - p1.x()) * t), scaled<coord_t>(p1.y() + (p2.y() - p1.y()) * t));
             }
             if (p2.z() > z)
                 all_pts.emplace_back(scaled<coord_t>(p2.x()), scaled<coord_t>(p2.y()));