WebGL materials example: Additive material was missing the `transparent: true`.

examples/webgl_materials.html

@@ -75,7 +75,7 @@
 				materials.push( new THREE.MeshLambertMaterial( { color: 0xdddddd, shading: THREE.FlatShading } ) );
 				materials.push( new THREE.MeshPhongMaterial( { ambient: 0x030303, color: 0xdddddd, specular: 0x009900, shininess: 30, shading: THREE.FlatShading } ) );
 				materials.push( new THREE.MeshNormalMaterial( ) );
-				materials.push( new THREE.MeshBasicMaterial( { color: 0x665500, blending: THREE.AdditiveBlending } ) );
+				materials.push( new THREE.MeshBasicMaterial( { color: 0xffaa00, transparent: true, blending: THREE.AdditiveBlending } ) );
 				//materials.push( new THREE.MeshBasicMaterial( { color: 0xff0000, blending: THREE.SubtractiveBlending } ) );
 
 				materials.push( new THREE.MeshLambertMaterial( { color: 0xdddddd, shading: THREE.SmoothShading } ) );