Clusters do not have a kinematic node or attached center, but they do have a local reference frame. When you apply a constrain to cluster, that local reference frame must be a full transform matrix which is calculated very quickly, and drives the position, tangency, and up vector of the constraint.
I could write my own method that converts a component cluster into a point collection, and then there are a number of ways to churn out a transformation from that data, but the performance is probably going to be sluggish.
There is a command that takes objects as input and spits out a bounding box. I was hoping for an analog that does that for local reference frames (whatever code the SRT box is using internally to do that).
On 10/6/07, squid <squid(at)3d-palace.com> wrote:
if the cluster has a center then : (
myCluster.CenterReference).Kinematics.Local.Transform
or (
myCluster.Parent3DObject).Kinematics.Local.Transform
both seem as nippy as each other to me.
i have a sneaking suspicion i've not understood the question though
Bradley Gabe wrote:
> If I have a pointer to, say, a polygon cluster, what is the quickest
> way performance-wise to get an SITransformation object for that
> cluster's local reference frame?
>
> I'm having no luck hunting this down in the SDK docs.
>
> Thanks!
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--
Jon Swindells
squid(at)3d-palace.com
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