Mesh as vol. file?


Dear Andrew! Thank you for making open source voxel based software!
It is a very interesting concept.
Meanwhile I have encountered some problems with understanding how to interact with M. I have a desired mesh(watertight scaled), which I am importing to monolith to play with it ( for example topology optimization). But after the step of importing my mesh. I can not figure out how to make recognize THIS layout as the volume boundary in the section of topology optimization. What step do I miss? or do i have to somehow process my mesh and convert it to stack of images / vol. file? Where and how can I do it?
or does it have to be a mask as mesh? but i tried it, also did not affect topopt. process