From d799e46d727d3ab229b46beab80c0f2758f907bc Mon Sep 17 00:00:00 2001
From: Sean Martin <martins7@tcd.ie>
Date: Wed, 20 May 2026 23:43:56 +0200
Subject: [PATCH] fix: don't write depth during max projection copy

---
 src/perspective_view/panel.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/perspective_view/panel.ts b/src/perspective_view/panel.ts
index c3262d648e..32a4656231 100644
--- a/src/perspective_view/panel.ts
+++ b/src/perspective_view/panel.ts
@@ -1363,10 +1363,12 @@ export class PerspectivePanel extends RenderedDataPanel {
       );
       gl.stencilMask(2);
       if (hasVolumeRenderingPick) {
+        gl.depthMask(false);
         this.maxProjectionPickCopyHelper.draw(
           this.maxProjectionPickConfiguration.colorBuffers[0].texture /*depth*/,
           this.maxProjectionPickConfiguration.colorBuffers[1].texture /*pick*/,
         );
+        gl.depthMask(true);
       }
       for (const [renderLayer, attachment] of visibleLayers) {
         if (