WebGPUObjects: Improve geometry check.

examples/jsm/renderers/webgpu/WebGPUObjects.js

@@ -15,9 +15,9 @@ class WebGPUObjects {
 		const updateMap = this.updateMap;
 		const frame = this.info.render.frame;
 
-		if ( geometry.isGeometry ) {
+		if ( geometry.isBufferGeometry !== true ) {
 
-			throw 'THREE.WebGPURenderer: Geometries of type THREE.Geometry are not supported. Please use THREE.BufferGeometry.';
+			throw 'THREE.WebGPURenderer: This renderer only supports THREE.BufferGeometry for geometries.';
 
 		}