[ODE] Newbie question - my sphere's position occasionally goes to -1#IND000.

[Thomas Grimes]

Alright I had similar problem before so maybe I can help. First you can try 
increasing the mass of the sphere to some large amount. If that doesn't 
work, then maybe this is more similar to my problem. What I had was in the 
NearCallback function, I had the dContactSoftCFM flag specified in 
contact[i].surface.mode and in the contact[i].surface.soft_cfm field I had 
it set to 0.0. I noticed if you do that, you will get problems with things 
wanting to dissapear. I had it set to 0 b/c I didn't like the effect of 
soft_cfm for my particular simulation. What I did to fix it was just remove 
the dContactSoftCFM flag and the soft_cfm line of code and it solved my 
problem. What soft_cfm wants is a non-zero number. I don't know what happens 
if you put in a negative number though, never tried that. Anyway, just know 
never to set surface.soft_cfm to 0. :)

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