fix webGLBufferRenderer renderInstance bug when position is interleavedBufferAttribute

src/renderers/webgl/WebGLBufferRenderer.js

@@ -31,20 +31,8 @@ function WebGLBufferRenderer( gl, extensions, info ) {
 
 		}
 
-		var position = geometry.attributes.position;
-
-		if ( position.isInterleavedBufferAttribute ) {
-
-			count = position.count;
-
-			extension.drawArraysInstancedANGLE( mode, 0, count, geometry.maxInstancedCount );
-
-		} else {
-
 		extension.drawArraysInstancedANGLE( mode, start, count, geometry.maxInstancedCount );
 
-		}
-
 		info.update( count, mode, geometry.maxInstancedCount );
 
 	}