LlPassTouches: Difference between revisions

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m Highlighted the difference between a child having a touch event or not.
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{{LSL_Function
{{LSL_Function
|inject-2={{Issues/SVC-3306}}{{LSL Function/Pass|pass|{{LSLGC|Touch|touch}}|Touches|default=PASS_IF_NOT_HANDLED|tf=*}}
|func_id=154|func_sleep=0.0|func_energy=10.0
|func_id=154|func_sleep=0.0|func_energy=10.0
|func=llPassTouches|p1_type=integer|p1_name=pass|p1_desc=boolean, if [[TRUE]], touches are passed from children on to parents
|func=llPassTouches|p1_type=integer|p1_subtype=pass|p1_name=pass
|func_footnote=The default is [[TRUE]] if there is no script to handle the touch events.
|func_footnote
|func_desc=Sets pass-touches [[prim]] attribute.
|func_desc=Sets whether touches detected on this prim are passed to the root [[prim]].
|return_text
|return_text
|spec
|spec
|caveats=This has no effect (whether set [[TRUE]] or [[FALSE]]) from the root. Touches are always passed to the parent when there is '''no touch event script in the child''', even if this is set ([[TRUE]] or [[FALSE]]) within another event in a child's script.  If you want to block touches from a child by using this function, you must add a script '''with a touch event''' in the child and set to [[FALSE]].
|caveats
|constants
|constants
|examples=Make a two prim [[LINK_SET]] (Object). Name the root "Parent" and the child "Child". To the root add this script -<lsl>integer told;


default
{
    state_entry()
    {
        told = FALSE;
    }
    touch_start(integer total_number)
    {
        if(!(llDetectedLinkNumber(0) == llGetLinkNumber()))// We can use a condition like this to filter from which prims touches are triggered.
        {
            llSay(0, "My child tells me you touched it. Abuse report pending.");// This will only be spoken if the child is touched twice.
            told = TRUE;
        }
        else
        {
            if(!told)
            llSay(0, "You can touch me all you like");// The unaware Parent leads you on.
            else
            llSay(0, "If I had my way you would have your hands cut off!");// Not any more.
        }
    }
}</lsl>And to the child add this script -<lsl>integer once_is_too_often;
default
{
    state_entry()
    {
        llPassTouches(FALSE);// Innocent child doesn't know to say something the first time.
        once_is_too_often = FALSE;
    }
    touch_start(integer total_number)
    {
        if(llDetectedLinkNumber(0) == llGetLinkNumber())// Again we check who is being touched.
        {
            if(!once_is_too_often)
            {
                llSay(0, "If you touch me again I'm telling.");
                llPassTouches(TRUE); // But if a second time, it will tell.
                once_is_too_often = TRUE;// And then fall silent.
            }
        }
    }
}</lsl>
|helpers
|helpers
|also_events=
|also_events=
Line 64: Line 21:
|notes
|notes
|permission
|permission
|negative_index
|history=
* Introduction: ?
* Change: {{Jira|SVC-5923}} - Server version 1.40.2 - New {{LSLPT|pass}} value added: 2
|sort=PassTouches
|sort=PassTouches
|cat1=Touch
|cat1=Touch
|cat2=Prim
|cat2=Prim
|cat3=Detected
|cat3=Detected
|cat4
|cat4=Passable
}}
}}

Latest revision as of 09:38, 3 December 2025

Summary

Function: llPassTouches( integer pass );
0.0 Forced Delay
10.0 Energy

Sets whether touches detected on this prim are passed to the root prim.

• integer pass – PASS_* flag

Whether Touches are passed to the root prim depends not only on which PASS_* flag is selected, but may also depend on if there is a script that in the prim that handles one of the touch events. For this reason most users will want to use PASS_ALWAYS or PASS_NEVER as they do not have this variable behavior.

The default value for this attribute is PASS_IF_NOT_HANDLED.

pass Constant Value touch Script No touch Script Description
PASS_IF_NOT_HANDLED 0 not passed passed Default: Touches are passed if there is no script handling the event in the prim.
PASS_ALWAYS 1 passed passed Touches are always passed to the root.
PASS_NEVER 2 not passed not passed Touches are never passed to the root.

Caveats

  • Has no known effect if called from within the root prim.
  • The script must be located in the prim whose pass-touch behavior is being changed; if not, the prim reverts to the default pass-touch setting.

Examples

See Also

Events

•  touch_start
•  touch
•  touch_end

Functions

•  llPassCollisions

Deep Notes

TRUE & FALSE vs. PASS_* flags

Prior to Server Version 1.40.2, pass was couched in terms of being a boolean and the only meaningful values were 0 and 1. The best practice at that time was to use the integer constants TRUE and FALSE. The design of this function left much to be desired. The problem was that while TRUE always caused all Touches to be passed along to the the root, FALSE would only not pass Touches if there the prim had a script that handled a touch event. This meant to fully utilize this function the prim must contain a script that handled touch events! With the release of Server Version 1.40.2, the PASS_* flags were introduced and the subtype of the pass was changed. Specifically the introduction of PASS_NEVER solved this problem, allowing content creators to eliminate scripts that were only in the object to tweak the passing of touch events.

History

  • Introduction: ?
  • Change: SVC-5923 - Server version 1.40.2 - New pass value added: 2

Signature

function void llPassTouches( integer pass );
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