ThinkingParticles: how to change sc joint type by several inputs?

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  03 March 2013
ThinkingParticles: how to change sc joint type by several inputs?

I'm studying TP from few days, tons of head aches...
In my demolition test I would to control sc joint types by several parameters.
The first idea is to transform joints nearest a broken one from fixed to spherical (for a better transition from rigid to collapsed structures).
An espression helper (an if/then cycle) would be a good starting point:

if the "x" joint was connected with a broken joint then changes from type (1) to (0), else remains to type (1).

How can I detect "x" joints?
  03 March 2013
You can use a PSearch or PPassAB, its particle output into a joint counter. Then the joint counter - into joint data node, and you can read the properties of the joints from there.
  03 March 2013
If you want to switch joint types in progress prepare for problems
  03 March 2013
thanks for reply,
The image I've linked is what my brain is able to do at this time and I'm not sure that joint counter and joint data are right.
the upper scheme is what I wish to obtain...
Attached Images
File Type: jpg tp_joint.jpg (54.7 KB, 8 views)
  03 March 2013
Make joint breakable. This work fine for dynamic impacts.
Changing type often can cause a problems in stability.
  03 March 2013
You'll get better results if you put the joint center between the two objects, like (pos1-pos2)/2 + pos1
  03 March 2013
J-B: I think you are right...complex joint explodes, 4 iteration per frame works fine in "simple" situations (and spring joints are orrible creaturs).

Hristo: TP is a new tool for me. I've spended the last 2 neurons of my brain to understand that I can offset joint positions by the world position input using expressions (as I think you've suggested me ).

However, thanks for your helped me considerably to improve my TP learning.
  03 March 2013
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