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Topology again (Shift-retopo and Max Strip Lenght)

Hello

Another bunch of questions for retopo, the goal of these is to make retopo faster :

1- There was a time we could quickly retopo a model by “painting” with the Shift key: this allow to quickly retopo a model when we want only a few change in the retopo. This fonction was crashing Zbrush Mac on 3.2 but seems to work on some case in ZB4 Mac (at least, it doesn’t crash).

But I remark that sometimes it doesn’t work, sometimes it work as expexted and sometimes it clear topology instead of adding. I don’t know if it’s me that doesn’t made the step right or if it is buggy.
Can someone give a clear step by step procedure to have this to work?

2-Althought I understand what the docs says about Max Strip Lenght in the retopo panel, I can’t have it working. any advice or step by step ?

Thanks for your help and sorry for my poor english.

Someone knows?