To use the openMat Python library just unzip the file "openMat.zip". It contains a Python package in the directory "openMat".

For a demonstration how this library can be used whithin a 3D-design-application, the 3D-application blender is used. 

For more information how to get Blender and how to use it:
http://www.blender.org 

To use the Blender addon, unzip another file named "acousticAddons.zip". It contains the directory "acousticAddons". 

Move both directories with their content into the directory <Path_to_blender>/2.63/scripts/addons

Whithin Blender select the menu 

->File->User Preferences...

In the tab "Addons" choose the addon "Physics: roomacoustics"

Now You can see:

1. A new scene panel named "Acoustics" to set the air damping constants for the octave bands from 125Hz up to 4kHz. But You need not to change these values.

2. A new material panel named "Acoustics" to edit the acoustic absorption coefficients and the scatter coefficients of a material.

3. A new object panel named "Acoustics" with a button to calculate the reverberatioon times (Sabine and Eyring) for an mesh object with materials attributed to its faces.

4. There is a new operator to import openMat-XML files. To use it, call the list of operators with the spacebar. The operator is named "Import acoustic materials". Then choose the openMat-XML file and press the button "Import acoustic materials". For visualisation the imported materials are attributed to new plane objects in the last layer. When an openMat-material owns a texture, the imported material uses that texture. Otherwise an diffuse color is derived from the absorption coefficients for visualisation.

The import addon uses only absorption data from the openMat-XML files. An primitive interpolation routine is used to get absorption coefficients for the octave bands from 125Hz up to 4kHz even if there are values for other frequencies in the openMat file.