[Opensim-users] llCastRay and object shapes

[Chris]

If I recall correctly, the default physics engine was switched to 
BulletSim some time ago although I can't recall when. Assuming recent 
code is being used and also assuming the physics engine hadn't been 
switched from default I would venture to say that BulletSim is likely 
being used, but, that is just a guess on my part based on what I've seen 
and experimented with myself; I have no idea what setup OSGrid is using 
since it has been a while since I've ran a sim connected there.

I haven't had a chance to test this myself on BulletSim but I have 
noticed some slight quirkiness with cast ray on some surfaces 
(especially angled prims). I've not given it a full run on tests as I 
haven't used the cast ray functions all that much in my scripting.

On 2/25/2014 10:48 AM, Handy Low wrote:
> Gwyneth Llewelyn <gwyneth.llewelyn <at> gwynethllewelyn.net> writes:
>
>> Hi Handy,
>>
>> Just for the sake of completeness, did you test with ODE or BulletSim? I
> believe the implementation might be
>> slightly different (or, then again, it's just my not-so-precise testing).
>>
>> Thanks,
>>
>> 	- Gwyn
>>
>> On 25/02/2014, at 16:09, Handy Low wrote:
>>
>>> Currently it seems that the OpenSim implementation of llCastRay() gives
>>> coordinates on a target object that lie on the bounding box of the
> object
>>> rather than on the face of the prim itself.
>>>
>>> For example, casting a ray at a pair of linked cubes in OpenSim will
> generate
>>> coordinates that lie on the cuboid bounding box that constrains both
> cubes.
>>> Likewise, casting a ray at a sphere will generate a point on the
> sphere's
>>> cubic bounding box.
>>>
>>> In SL, the same tests will both return points on the prim surfaces.
>>>
>>> Is this expected behaviour?
>>>
>>> Thanks
> Thanks to Michael and Gwen for the fast replies.
>
> Off the top of my head, I don't know which physics engine they were using,
> or how I can find out - the tests I've been doing have been in OSGrid
> (Sandbox Plaza) and in Kitely, if that's any help.
>
> --
> Handy
>
> _______________________________________________
> Opensim-users mailing list
> Opensim-users at lists.berlios.de
> https://lists.berlios.de/mailman/listinfo/opensim-users


-- 
OpenSim: 10 Region Standalone on 0.7.6 Dev
Physics: Open Dynamics Engine
OS: Windows 7 (x64)
CPU: AMD Phenom II X4 840 3.2 GHz
Memory: 11 GB DDR3
Database: MySQL 5.1.63 (x64)