When active, this setting will check if the tips of the guides to be planted lie closer to the surface than their roots. If so, the tips will be converted to roots and the guides will be planted. So, what’s this good for? Well, let’s say you have imported hair as splines from another application. When you convert these splines to guides, it can happen that the guides will be arranged in an inverted manner. This option lets you quickly fix this.
The guides to be planted will be rotated so their root segments are oriented in the direction of the surface Normals.
This is the maximum distance the guide roots can be displaced when the guides are planted. If the root does not find an appropriate surface within this distance, it will remain unrooted.