fix set automatic .transparent NodeMaterial (#9243)

* fix set automatic .transparent NodeMaterial

* minimalist optimization

examples/js/nodes/NodeMaterial.js

@@ -210,7 +210,7 @@ THREE.NodeMaterial.prototype.build = function() {
 	}
 
 	this.lights = this.requestAttrib.light;
-	this.transparent = this.requestAttrib.transparent;
+	this.transparent = this.requestAttrib.transparent || (this.blendMode !== THREE.NormalBlending && this.blendMode !== THREE.NoBlending);
 
 	this.vertexShader = [
 		this.prefixCode,