---
title: "Parameters"
url: "https://help.maxon.net/c4d/en-us/Content/html/GVHAIR_INTERSECTION-ID_GVPORTS.html"
section_path: "Simulate Menu > The Simulation System > Hair > Hair Nodes > Hair Intersection > Parameters"
element_id: "GVHAIR_INTERSECTION"
group_id: "ID_GVPORTS"
description: "Use this port to pass an object to be checked for overlapping, or drag an object into the Reference field."
---

## Parameters

### Object

Parameter ID: `GV_HAIR_INTERSECTION_INPUT_OBJECT`

Use this port to pass an object to be checked for overlapping, or drag an object into the **Reference** field.

### Position

Parameter ID: `GV_HAIR_INTERSECTION_INPUT_POSITION` · Range: [XYZ ]

Use this setting port to enter a position vector. This can be done more easily in the XPresso Editor by connecting the positions of corresponding objects or particles to the **Position** input port.

### Velocity

Parameter ID: `GV_HAIR_INTERSECTION_INPUT_VELOCITY` · Range: [XYZ ]

A velocity vector can be entered here, or simply connect the corresponding velocity vectors to the **Velocity** input port in the XPresso Editor.

How can the velocity vectors of (normally) animated objects be ascertained?

Drag the object into the XPresso Editor and subsequently activate the **History Level** setting with a value of at least **1**. Finally, select **Position Velocity** as your output port.

### Radius

Parameter ID: `GV_HAIR_INTERSECTION_INPUT_RADIUS` · Range: [-∞..+∞]

This is the radius of the (virtual) spherical **area of detection** that is placed around a given position that should be checked for collision with guides or hairs. Enter a value greater than **0**, otherwise no intersections will take place.

### Intersection

Parameter ID: `GV_HAIR_INTERSECTION_INTERSECTION`

The result of this output port is a Boolean **true** or **false**, depending on whether or not intersections take place.

### Guide

Parameter ID: `GV_HAIR_INTERSECTION_GUIDE` · Range: [-2147483648..2147483647]

This port outputs the guide number of the intersecting guide.

### Segment

Parameter ID: `GV_HAIR_INTERSECTION_SEGMENT` · Range: [-2147483648..2147483647]

This port outputs the segment number of the intersected segment.

### Segment Delta

Parameter ID: `GV_HAIR_INTERSECTION_SEGMENT_T` · Range: [-∞..+∞]

This port outputs the exact position at which a given segment was intersected. A value between 0 (segment start) to **1** (segment end) will result.

### Ray Delta

Parameter ID: `GV_HAIR_INTERSECTION_RAY_T` · Range: [-∞..+∞]

This port outputs the exact position at which a given velocity vector was intersected. A value between 0 to **1** will result.

### Position

Parameter ID: `GV_HAIR_INTERSECTION_POSITION` · Range: [XYZ ]

This port outputs the point of intersection on the guide containing the velocity vector as vector.