Mesh To Solid for Rhino 

Mesh To Solid for Rhino is a plug-in for Rhino 2.0 and 3.0. This plug-in gives Rhino to ability to convert a mesh into a solid.
mesh to solid for rhino mesh solid mesh to solid convert converter polygon mesh plug-in add-in rhino translator utility polysurface surface

PIX Import for Rhino 

PIX Import for Rhino is a plug-in for Rhino. This plug-in gives Rhino the ability to import graphical data from PIX files.
pix import for rhino pix import pix import importer import pix open pix open file plug-in add-in rhino translator utility