Direction tilts fibres away from pointing straight out of the surface, so they lean in a consistent direction, for example to flow back along a body. It's a quick way to give fur an overall direction without a groom. Inclination tilts the fibres towards the Up Vector and Roll tilts them sideways, and the Normal and Up Vector parameters set the frame these are measured in.
| Input | Accepts | Description |
|---|
| 0 | Fibres | The fibres whose direction to change. |
Parameters
| Parameter | Description |
|---|
| Weight | How much the fibres follow the new direction. |
| Random | Randomly reduces the roll and inclination of each fibre. |
| Roll | Tilts the fibres sideways from the normal, across the Up Vector, from -1 to 1. A value of 1 or -1 tilts them a full 90 degrees. |
| Inclination | Tilts the fibres from the normal towards the Up Vector (or away from it, with negative values), from -1 to 1. A value of 1 or -1 tilts them a full 90 degrees. |
| Normal | The surface normal. Together with the Up Vector, this defines the reference frame for the new direction. Defaults to $N. |
| Up Vector | The up vector. It defaults to the Y axis, but you can set it to a varying attribute to randomize the direction. |