New to modding unity here, but familiar with blender and modding other games.

few queries

best format for exporting mesh?
do mesh need materials or handled separately? (if separate what format?)
does unity support vertex shaded mesh?

from dev tutorial looks like collision is handled through unity not blender and shipped with mesh.

what's comfortable poly range for "SWPT" or unity engine in general.
tri's or quads preference?

how does game handle the origin/interaction points for purpose of animation with regards to assets?
eg mesh weapon handle needs to be on certain co-ord with fixed facing or handled through the collision?
are all weapon mesh solid/fixed or do they support physics (whips/flails etc)?

thanks