From e700113b39f39b837175c680929538aa9655a9f9 Mon Sep 17 00:00:00 2001
From: Kiss Lorand <50251547+kisslorand@users.noreply.github.com>
Date: Tue, 16 Jun 2026 21:50:09 +0300
Subject: [PATCH] Fix non-organic tree support base clearance above object
 surfaces (#14128)

---
 src/libslic3r/Support/TreeSupport.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/libslic3r/Support/TreeSupport.cpp b/src/libslic3r/Support/TreeSupport.cpp
index 7ae0cd94c8..0a8cda619d 100644
--- a/src/libslic3r/Support/TreeSupport.cpp
+++ b/src/libslic3r/Support/TreeSupport.cpp
@@ -2349,6 +2349,15 @@ void TreeSupport::draw_circles()
                     ts_layer->base_areas = std::move(expanded_base_areas);
                 }
 
+                // Orca: Final tree base polygons may be too close above model surfaces.
+                // Enforce bottom Z clearance for non-contact support layers as well.
+                if (!ts_layer->base_areas.empty()) {
+                    const Polygons trimming = get_trim_support_regions(
+                        *m_object, ts_layer, 0., m_slicing_params.gap_object_support, 0);
+                    if (!trimming.empty())
+                        ts_layer->base_areas = diff_ex(ts_layer->base_areas, trimming);
+                }
+
                 auto &area_groups = ts_layer->area_groups;
 
                 for (auto& expoly : ts_layer->base_areas) {