From acc5be7e79716ed2d6db0fc35d88bdaec6a9c0f6 Mon Sep 17 00:00:00 2001
From: SirKero <sirkero@gmx.de>
Date: Mon, 5 Oct 2026 12:03:39 +0200
Subject: [PATCH] Added Transmission support if GLTF2 is used

---
 .../importers/AssimpImporter/AssimpImporter.cpp     | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Source/plugins/importers/AssimpImporter/AssimpImporter.cpp b/Source/plugins/importers/AssimpImporter/AssimpImporter.cpp
index f06cb8e06..b54efc6a8 100644
--- a/Source/plugins/importers/AssimpImporter/AssimpImporter.cpp
+++ b/Source/plugins/importers/AssimpImporter/AssimpImporter.cpp
@@ -975,6 +975,19 @@ ref<Material> createMaterial(
             specularParams.g = roughness;
 
         pMaterial->setSpecularParams(specularParams);
+
+        // Transmission
+        float transmission;
+        if (pAiMaterial->Get(AI_MATKEY_TRANSMISSION_FACTOR, transmission) == AI_SUCCESS)
+        {
+            pMaterial->setSpecularTransmission(transmission);
+            if (transmission > 0.f)
+            {
+                //Use Base Color as Transmission Color. 
+                float3 transmissionColor = pMaterial->getBaseColor().xyz(); 
+                pMaterial->setTransmissionColor(transmissionColor);
+            }
+        }
     }
 
     // Parse the information contained in the name