LlVolumeDetect

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/LSL

VolumeDetect

llVolumeDetect

Summary

1/2 Bugs

Function: llVolumeDetect( integer detect );

248	Function ID
0.0	Forced Delay
10.0	Energy

If detect is TRUE, VolumeDetect is enabled, physical object and avatars can pass through the object.

• integer

detect

–

TRUE enables, FALSE disables

This works much like Phantom, but unlike Phantom, VolumeDetect objects trigger collision_start and collision_end events when interpenetrating. Collision events will trigger in any script in the object.

Specification

Events queued depending on type

	VolumeDetect	Phantom
Events Supported	collision_start collision_end	land_collision_start land_collision land_collision_end

Differences

There are a couple differences in how Phantom and VolumeDetect handle collisions; specifically which events are supported and how they handle the ground.

VolumeDetect

• When physical they fall through the ground with the risk of going off-world.
• collision events are not triggered

Phantom

• When physical they collide with the ground but will not pass through (normal physical object behavior), land collision events are queued.

Caveats

• llDetectedLinkNumber will return 0 in collision_start and collision_end events of VolumeDetect objects (SVC-2996).
• It cannot be enabled on attachments^[1].
• It can only be applied to the root prim (which will make the entire object VolumeDetect).
• It only detects physical objects and avatars.
• When moving via llSetPos() by a loop of stages, collision events will not trigger.
• Attachments will not register collision events when the avatar collides with a VolumeDetect object.

Important Issues

~ All Issues ~ Search JIRA for related Bugs

SVC-8141

A

Volume Detect objects are not always allowing objects to pass through.

Examples

<lsl>default {

   state_entry()
   {
       llVolumeDetect(TRUE); // Starts llVolumeDetect
   }
   collision_start(integer total_number)
   {
       llSay(0, "Detected!"); // Tells you when something penetrates the prim
   }

}</lsl>

See Also

Events

•	collision_start
•	collision
•	collision_end

Functions

•

llPassCollisions

Deep Notes

All Issues

~ Search JIRA for related Issues

		SVC-8141	A		Volume Detect objects are not always allowing objects to pass through.
		SVC-2996	A		llDetectedLinkNumber returns 0 with llVolumeDetect(TRUE)

Footnotes

1. ^ Attachments aren't included in the avatar bounding box, so it's moot

Signature
function void llVolumeDetect( integer detect );