From 3ff9a65ef3c3f1735d8730868a8b7dc984fc76fc Mon Sep 17 00:00:00 2001
From: Ibrahim <93064150+IbrahimCSAE@users.noreply.github.com>
Date: Wed, 16 Jul 2025 14:40:20 -0400
Subject: [PATCH] fix(black-viewports): MPR viewports were turning black if
 their parent stack had it's properties reset (#5219)

---
 .../ViewportService/CornerstoneViewportService.ts        | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts b/extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts
index ee29fcf36..0548bcc95 100644
--- a/extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts
+++ b/extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts
@@ -345,6 +345,11 @@ class CornerstoneViewportService extends PubSubService implements IViewportServi
         delete properties?.voiRange;
         delete properties?.VOILUTFunction;
       }
+      if (properties?.colormap) {
+        if (properties.colormap?.opacity?.length === 0) {
+          delete properties.colormap.opacity;
+        }
+      }
       return properties;
     };
 
@@ -1080,8 +1085,8 @@ class CornerstoneViewportService extends PubSubService implements IViewportServi
       const { dimensions, spacing } = imageVolume;
       const slabThickness = Math.sqrt(
         Math.pow(dimensions[0] * spacing[0], 2) +
-          Math.pow(dimensions[1] * spacing[1], 2) +
-          Math.pow(dimensions[2] * spacing[2], 2)
+        Math.pow(dimensions[1] * spacing[1], 2) +
+        Math.pow(dimensions[2] * spacing[2], 2)
       );
 
       return slabThickness;