## Issue

Can someone please explain to me what does this function do :

```
void QMatrix4x4::rotate ( const QQuaternion & quaternion )
```

In the documentation, it’s written that it multiples * this matrix* by another that rotates coordinates according to a specified quaternion.

The question is which matrix is " this matrix" ? does it calculate a rotation matrix ?

## Solution

The question is which matrix is "this matrix" ?

"This matrix" refers to the matrix that this member function is called on.

does it calculate a rotation matrix ?

According to this source code, yes. The current matrix is multiplied by a rotation matrix that corresponds to the quaternion.

Answered By – Drew Dormann

Answer Checked By – Robin (BugsFixing Admin)