# Using external library materials¶

In this tutorial, we will see how to use advanced materials from external libraries in your scene. Measure-based coated glass materials are a good example.

## Before starting¶

You should have already exported your scene with SketchUp or Rhinoceros to an ocxml file, and set up a lighting environment. If not, load your 3D geometry file or follow Setting up a cloudy environment

You may also load the scene file exported at the previous tutorial : libmat-start.ocbin. It requires the envmap file nantes-cloudy.exr in the same folder.

## Opening the current glass material¶

The scene has been modeled with double glazing units : each window is made of two surfaces, corresponding to the two glass panes. Two different materials were applied to these panes : the external pane is named pane1 and the internal pane pane2.

Open the external glass material pane1 by double clicking it in the object toolbox

## Result¶

You may now start the render and obtain the following picture after a few minutes: