From 6ef02a67dbb22ae1a019d9f485f46bfc3e1b44aa Mon Sep 17 00:00:00 2001
From: Rodrigo Faselli <162915171+RF47@users.noreply.github.com>
Date: Thu, 20 Aug 2026 22:35:28 -0300
Subject: [PATCH] Revert "Fix unstable contours from triangulated planar faces"
 (#15315)

---
 src/libslic3r/TriangleMeshSlicer.cpp | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/src/libslic3r/TriangleMeshSlicer.cpp b/src/libslic3r/TriangleMeshSlicer.cpp
index 738965d75b..2c1c0da23f 100644
--- a/src/libslic3r/TriangleMeshSlicer.cpp
+++ b/src/libslic3r/TriangleMeshSlicer.cpp
@@ -1461,13 +1461,6 @@ static Polygons make_loops(
     chain_open_polylines_close_gaps(open_polylines, loops, max_gap, true);
 #endif
 
-    // Orca: A planar quad represented by two triangles contributes a point where the
-    // slicing plane crosses the shared diagonal. After rounding to coord_t this
-    // point may be very slightly off the otherwise straight contour edge. Apart
-    // from being redundant, such points make the subsequent contour
-    // simplification depend on the slice height (and may move seam candidates).
-    remove_collinear(loops);
-
 #ifdef SLIC3R_DEBUG_SLICE_PROCESSING
     {
         static int iRun = 0;