From 9c8f160edd16ba889ec705f26ada490e8ec488ed Mon Sep 17 00:00:00 2001
From: Sara <sara@objectionable.solutions>
Date: Tue, 3 Mar 2026 21:37:05 +0100
Subject: [PATCH] fix: lines cannot be 0 length

---
 modules/terrain/terrain_modifier.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/terrain/terrain_modifier.cpp b/modules/terrain/terrain_modifier.cpp
index a2eb3673..df9dfc9c 100644
--- a/modules/terrain/terrain_modifier.cpp
+++ b/modules/terrain/terrain_modifier.cpp
@@ -311,6 +311,9 @@ float TerrainModifierPath::evaluate_at(Vector2 world_coordinate, float before) {
 	for (int i{ 0 }; i < count; i++) {
 		Vector3 const ipos{ this->points[i] };
 		Vector3 const next_pos{ this->points[Math::wrapi(i + 1, 0, this->points.size())] };
+		if (ipos == next_pos) {
+			continue;
+		}
 		float dot, distance, percentage;
 		bool const is_start{ !this->closed && i == 0 }, is_end{ !this->closed && i == count - 1 };
 		float height{ evaluate_line(ipos, is_start, next_pos, is_end, world_coordinate, dot, distance, percentage) };