Improve road surface material creation to support custom material properties

src/runtime-three/runtime-host.ts

@@ -4309,24 +4309,41 @@ export class RuntimeHost {
     }
 
     const textureSet = this.getOrCreateTextureSet(material);
-
+    const isCustomMaterial = material.kind === "custom";
-    return this.configureRoadSurfaceMaterial(
+    const materialTransparent =
-      new MeshPhysicalMaterial({
+      isCustomMaterial &&
-        color: 0xffffff,
+      (material.opacity < 0.999 || textureSet.albedoHasAlpha);
+    const roadMaterial = new MeshPhysicalMaterial({
+      color: isCustomMaterial ? material.albedoColorHex : 0xffffff,
       map: textureSet.baseColor,
       normalMap: textureSet.normal,
       roughnessMap: textureSet.roughness,
-        roughness: 1,
+      roughness: isCustomMaterial ? material.roughness : 1,
       metalnessMap: textureSet.metallic,
-        metalness: textureSet.metallic === null ? 0.03 : 1,
+      metalness: isCustomMaterial
+        ? material.metallic
+        : textureSet.metallic === null
+          ? 0.03
+          : 1,
       specularColorMap: textureSet.specular,
       specularColor: new Color(0xffffff),
       specularIntensity: textureSet.specular === null ? 0.2 : 1,
+      transparent: materialTransparent,
+      opacity: isCustomMaterial ? material.opacity : 1,
+      depthWrite: !materialTransparent,
       side: DoubleSide
-      })
+    });
+
+    if (isCustomMaterial && textureSet.normal !== null) {
+      roadMaterial.normalScale.set(
+        material.normalStrength,
+        material.normalStrength
       );
     }
 
+    return this.configureRoadSurfaceMaterial(roadMaterial);
+  }
+
   private createRuntimeRoadSurfaceMaterial(path: RuntimePath): Material {
     return this.createRuntimeRoadGeneratedMaterial(path.road.material, 0x5f5747);
   }