[Opensim-dev] Setting a single child prim to Phantom

[John Sheridan]

I'm not sure if this works on OS yet as I've not tried it and I'm about 
to go to bed.  But...  If you're on viewer2+ try setting the physics 
type from "prim" to "none" in the build window.  On SL that would set 
that part to no physics - or the equivalent of phantom.


On 02/03/2013 02:16 AM, Oren Hurvitz wrote:
> I have recently become aware that there's an entire cottage industry of
> scripts whose purpose is to make a single prim in a linkset phantom. These
> scripts are needed because:
> a) Usually the phantom flag is set for an entire linkset, so it's necessary
> to use a script to change the flag for a single prim
> b) The LSL functions that change the Phantom flag (llSetStatus() and
> llSetPrimitiveParams()) change it for the entire linkset at once, so they
> can't be used to change a single prim.
>
> These scripts use a very complicated workaround that involve changing the
> prim's shape in several steps, which is brittle and dangerous. You can see
> the scripts here: http://wiki.secondlife.com/wiki/Phantom_Child
>
> In Second Life there is now a simpler and safer way to make a single prim
> stop colliding:
>
>    llSetLinkPrimitiveParamsFast(LINK_THIS, [PRIM_PHYSICS_SHAPE_TYPE,
> PRIM_PHYSICS_SHAPE_NONE]);
>
> However, this isn't implemented in OpenSim. And I don't know if it's exactly
> equivalent to making the prim phantom.
>
> I propose extending llSetStatus() to allow setting the phantom flag for a
> single prim. This involves adding the flag OS_STATUS_PHANTOM_PRIM. It works
> just like the existing flag STATUS_PHANTOM, but it operates on the prim that
> contains the script instead of the entire linkset. This behavior mirrors the
> way llSetStatus() works with the STATUS_BLOCK_GRAB flag: it also comes in
> two flavors, STATUS_BLOCK_GRAB (for a prim) and STATUS_BLOCK_GRAB_OBJECT
> (for the linkset).
>
> Any thoughts? Does anyone know of a different way to safely change the
> phantom flag for a single prim in a linkset?
>
> Oren
>
>
>
> --
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