# UI Interaction
## Hand Canvas Pointer
Simulates a cursor with clicking and sliding for interactions with [Unity Canvas UI ](https://docs.unity3d.com/Packages/com.unity.ugui@1.0/manual/index.html)in VR.
Canvas's require Graphics Raycaster component
Should go on an empty transform under the hand or controller. Requires a line renderer which will be automatically shown/hidden when interacting with UI.
`Hit Point Marker` is an object that will appear and match the hit position and normal of the targeted UI only when targeting a UI
`Raycast Length` the max length of the UI pointer
`Auto Show Target` is whether or not you should point, or point and click to activate the pointer
`UI Layer` is the physics layer a pointer can point at
### Events
`Start Select` called when actively pointing at a valid UI and the HandCanvasPointer.Press() function is called
`Stop Select` called when actively pointing at a valid UI and the HandCanvasPointer.Release() function is called
`Start Point` called when start pointing at a valid UI
`Stop Point` called when stop pointing at a valid UI
This is where the UI Pointer is on the default prefab
### Controller Input
A general script with a Unity Event attached to a controller action
{% tabs %}
{% tab title="OpenXR" %}
## OpenXR
{% endtab %}
{% tab title="XR" %}
## XRControllerEvent
{% endtab %}
{% tab title="Oculus Integration" %}
## OVRControllerEvent
{% endtab %}
{% tab title="SteamVR" %}
## SteamVRControllerEvent
{% endtab %}
{% endtabs %}
### Advanced Information
On Start this component will generate a camera (which does not render or create additional graphics overhead) set each canvas in the scene to use that camera for UI interaction, and destroy any additional event systems.
This system is not simultaneously compatible with desktop UI interaction or additional event systems in the scene
