Hi,topyra wrote: ↑Sat Nov 28, 2020 7:30 pmI am trying to make a McPherson strut using A2+, but encountered wired problem with moving parts.
Error "animation problem detected" appears in positions where whole model should behave quite stable (nothing "strained", all angles looks good etc.)
But when trying to animate it, in positions where lower arm is closer to horizontal positions, everything starts to broke apart, with an message "animation problem detected", that happen every time when reaching similar position of model. When "animation problem detected" appears, I can still click on "solve constrains" and it works, but still can move model in that direction.
nice model ! I can reproduce the problem and i guess, this is some instability of the axisCoincident constraint. I will have a look at the code, whether there is a bug or something else what can be improved.
As a temporary solution i inserted an additional pointOnLine constraint, see the red parts in the screenshot.
Compared to other numeric solvers the one of A2+ is not sensitive to redundant constraints and sometimes an additional constraint can stabilize computations. With adding the pointOnLine constraint at least i could extend the range where the simulation is working properly.
Nevertheless something is wrong with the solver here. But i need time to investigate this. Please find the modified files attached.
Unfortunately there is no more verbose mode. Debugging of such issues is very complex and is usually done with a lot of printouts from the code.