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

[Oren Hurvitz]

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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