From 7450c3ccfdfb906e366ac9727433866e6dd4189d Mon Sep 17 00:00:00 2001
From: Martin Gerhardy <martin.gerhardy@gmail.com>
Date: Sun, 23 Feb 2025 09:17:44 +0100
Subject: [PATCH] VOXEDIT: optimized region size reduction

---
 src/tools/voxedit/modules/voxedit-util/SceneManager.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/tools/voxedit/modules/voxedit-util/SceneManager.cpp b/src/tools/voxedit/modules/voxedit-util/SceneManager.cpp
index 782ff03b4..889e7bb6b 100644
--- a/src/tools/voxedit/modules/voxedit-util/SceneManager.cpp
+++ b/src/tools/voxedit/modules/voxedit-util/SceneManager.cpp
@@ -669,8 +669,10 @@ void SceneManager::nodeResize(int nodeId, const voxel::Region &region) {
 		// we don't have to re-extract a mesh if only new empty voxels were added.
 		modified(nodeId, voxel::Region::InvalidRegion);
 	} else {
-		// TODO: assemble the 6 surroundings to optimize this for big volumes
-		modified(nodeId, newVolume->region());
+		const core::DynamicArray<voxel::Region> &regions = voxel::Region::subtract(oldRegion, region);
+		for (const voxel::Region &r : regions) {
+			modified(nodeId, r);
+		}
 	}
 
 	if (activeNode() == nodeId) {