Add KHR_materials_emissive_strength export support (playcanvas#8268)

willeastcott · web-flow · commit 95b4d30343f2 · 2025-12-19T10:36:32.000Z
* Add KHR_materials_emissive_strength export support

* Use includes
diff --git a/src/extras/exporters/gltf-exporter.js b/src/extras/exporters/gltf-exporter.js
@@ -356,12 +356,12 @@ class GltfExporter extends CoreExporter {
                 };
 
                 json.extensionsUsed = json.extensionsUsed ?? [];
-                if (json.extensionsUsed.indexOf('KHR_texture_transform') < 0) {
+                if (!json.extensionsUsed.includes('KHR_texture_transform')) {
                     json.extensionsUsed.push('KHR_texture_transform');
                 }
 
                 json.extensionsRequired = json.extensionsRequired ?? [];
-                if (json.extensionsRequired.indexOf('KHR_texture_transform') < 0) {
+                if (!json.extensionsRequired.includes('KHR_texture_transform')) {
                     json.extensionsRequired.push('KHR_texture_transform');
                 }
 
@@ -406,6 +406,18 @@ class GltfExporter extends CoreExporter {
             const { r, g, b } = emissive.clone().linear();
             output.emissiveFactor = [r, g, b];
         }
+
+        if (mat.emissiveIntensity !== 1) {
+            output.extensions = output.extensions || {};
+            output.extensions.KHR_materials_emissive_strength = {
+                emissiveStrength: mat.emissiveIntensity
+            };
+
+            json.extensionsUsed = json.extensionsUsed ?? [];
+            if (!json.extensionsUsed.includes('KHR_materials_emissive_strength')) {
+                json.extensionsUsed.push('KHR_materials_emissive_strength');
+            }
+        }
     }
 
     writeMaterials(resources, json) {
