[Fixed]1.7.5 Target penetration

[Kilinich]

This issue was fixed at v1.7.6.
This bug was seen with v1.7.2 - v1.7.5.

-Tatt
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1.7.5
Looks like something changed in 1.7.5 with polygon collision and penetration. Sometimes polygons starts fall deep into boxes (all density approx normal 2.0). I can't found simple case yet but notice that in portals scene http://www.algodoo.com/algobox/details/35865 (Santa's feet stuck into ladder or ice castle and strangely shake).

[Kilinich]

Another experiment shows that not only polygons shakes on contact.
This scene consist only from "perfect" geometries (circles, planes, box) but shake like hell.
[scene]45208[/scene]

Playing with sim.targetPenetration can help, but I think there must be other way to handle contacts...

[Sonic]

I noticed that too.

[Kilinich]

Looks like something changed in 1.7.5 with polygon collision and penetration.

I was wrong. Bug introduced in 1.7.2 (1.7.1 was fine).

"Fixed collision respons issues with objects sliding along curved polygons."
Maybe this update cause it?

I've dig a little and found difference in collision points.

Here it is screen-shots:

[Kilinich]

Another fact - that same polygons have perfect contact with infinite plane but penetrate in box geom.

[Kilinich]

Got it. Looks pretty simple to troubleshoot.

[scene]45286[/scene]

[emilk]

Great find, Kilinich, you rock! This will be fixed in 1.7.6