I do my lighthing calculation in model space and hence hace to transform the light pos from world to model space fast.

The model transformation is basically M = [T] * [R]

Given a matrix:

```
Xaxisx YAxisx ZAxisx Translationx
Xaxisy YAxisy ZAxisy Translationy
Xaxisz YAxisz ZAxisz Translationz
0 0 0 1
```

I wonder if a shortcut would be valid:

```
Xaxisx XAxisy XAxisz -Translationx
Yaxisx YAxisy YAxisz -Translationy
Zaxisx ZAxisy ZAxisz -Translationz
0 0 0 1
```

Or do I have to do M = [R]-1 * [T]-1