From 73645a1047bffbf95b6a99ebda3f99e8536ff9f0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Foucault?= <foucault.clem@gmail.com>
Date: Thu, 9 Oct 2025 19:35:41 +0200
Subject: [PATCH] Fix #147542: Overlay: Curve Sculpt Mode: Z-fighting with Cage
 overlay

The overlay just needed a bit of Z bias to avoid Z fighting.
---
 .../overlay/shaders/overlay_sculpt_curves_cage_vert.glsl        | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/source/blender/draw/engines/overlay/shaders/overlay_sculpt_curves_cage_vert.glsl b/source/blender/draw/engines/overlay/shaders/overlay_sculpt_curves_cage_vert.glsl
index 8422cce9383..a51fa78fea7 100644
--- a/source/blender/draw/engines/overlay/shaders/overlay_sculpt_curves_cage_vert.glsl
+++ b/source/blender/draw/engines/overlay/shaders/overlay_sculpt_curves_cage_vert.glsl
@@ -14,6 +14,8 @@ void main()
 {
   float3 world_pos = drw_point_object_to_world(pos);
   gl_Position = drw_point_world_to_homogenous(world_pos);
+  /* Small bias to always be on top of the geom. */
+  gl_Position.z -= 1e-3f;
 
   final_color = float4(selection);
   final_color.a *= opacity;