« Return to Thread: Repulsion between physical and other objects
Re: Repulsion between physical and other objects
by Glen Canaday
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The physics engine doesn't work well with machinery. Generally speaking,
I'd write in a sensor that locates a central object and uses llSetPos()
and llSetRot() to match. I did this with a rotating clock pendulum and
a swing. You can still rotate the central object and the wheel will
follow within the sensor repeat time. If the object hasn't moved (or has
only moved < .1M, say), you can easily just rotate it around where the
"shaft" would be and people can hop on and ride at will. This also frees
you from the 31-prim (including sitters!) physical prim limit since you
don't need physics, so you can make a huge one if you like. The only
hard part is remembering how to multiply / divide the quaternion
rotations ;)
G
Anderson Philbin wrote:
> Hi,
>
> I'm trying to build a rotating mechanism similar to a ferris wheel.
> llTargetOmega should do the trick but my problem is controlling the
> repulsion between the objects. For example, a hollow cylinder around a
> shaft will tear itself off the shaft if you change it to physical. The
> repulsion effect seems to die down at about 100-125 mm clearance.
>
> I've left a hollow cylinder happily spinning about a shaft with end
> caps, all with 125 mm clearance. I come back an hour later and the
> cylinder is laying on the ground. I understand the repulsion is
> provided by Havok 4 when objects interpenetrate but I'm trying to find
> out how to measure it and, perhaps, control it. Also, there seems to
> be a friction effect too. My full-size object just binds, it doesn't
> rotate at all.
>
> Is there any documentation on this? Should I be trying to
> independently move the components rather than using spacial contraints?
>
> TIA
>
> Anderson Philbin
> ------------------------------------------------------------------------
>
> _______________________________________________
> Click here to unsubscribe or manage your list subscription:
> https://lists.secondlife.com/cgi-bin/mailman/listinfo/secondlifescripters
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_______________________________________________
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I'd write in a sensor that locates a central object and uses llSetPos()
and llSetRot() to match. I did this with a rotating clock pendulum and
a swing. You can still rotate the central object and the wheel will
follow within the sensor repeat time. If the object hasn't moved (or has
only moved < .1M, say), you can easily just rotate it around where the
"shaft" would be and people can hop on and ride at will. This also frees
you from the 31-prim (including sitters!) physical prim limit since you
don't need physics, so you can make a huge one if you like. The only
hard part is remembering how to multiply / divide the quaternion
rotations ;)
G
Anderson Philbin wrote:
> Hi,
>
> I'm trying to build a rotating mechanism similar to a ferris wheel.
> llTargetOmega should do the trick but my problem is controlling the
> repulsion between the objects. For example, a hollow cylinder around a
> shaft will tear itself off the shaft if you change it to physical. The
> repulsion effect seems to die down at about 100-125 mm clearance.
>
> I've left a hollow cylinder happily spinning about a shaft with end
> caps, all with 125 mm clearance. I come back an hour later and the
> cylinder is laying on the ground. I understand the repulsion is
> provided by Havok 4 when objects interpenetrate but I'm trying to find
> out how to measure it and, perhaps, control it. Also, there seems to
> be a friction effect too. My full-size object just binds, it doesn't
> rotate at all.
>
> Is there any documentation on this? Should I be trying to
> independently move the components rather than using spacial contraints?
>
> TIA
>
> Anderson Philbin
> ------------------------------------------------------------------------
>
> _______________________________________________
> Click here to unsubscribe or manage your list subscription:
> https://lists.secondlife.com/cgi-bin/mailman/listinfo/secondlifescripters
>
_______________________________________________
Click here to unsubscribe or manage your list subscription:
https://lists.secondlife.com/cgi-bin/mailman/listinfo/secondlifescripters
« Return to Thread: Repulsion between physical and other objects
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