I know, that this subject is very popular, but I haven't found answer for my question.
I need to create destructible objects. I thought, that for this job I need only fixed constraints or joints. But bullet doesn't support this functionality (or I missed something), and these joints are elastic too.
I found another solution - compound shapes. Its look nice, but I need special feature: object should collapse under its own weight. It is possible to do, with compound shapes ?
//EDIT:
I think, I figured out how to implement this.