New: V4 underwent a major rewrite from V3 to get to a cross platform code base. 64-bit builds for both Windows and Mac. Native Mac build, compatible with new operating systems.
Multi-core processing for opening CAD files - Loading objects from 3DM, STEP, IGES, and SAT files will now use multiple CPU cores for processing objects being loaded resulting in a major speed increase.
Display engine updated to make use of modern GPUs with lots of VRAM - display data is now cached in the GPU's VRAM which results in faster redraw speed for large files.
Polygon Sub-d surface to NURBS conversion method, available on the side pane under SubD > Create > From file. This allows you to open an .obj file that contains a sub-d control polygon cage and have it converted to a high quality NURBS object in MoI. This enables a hybrid workflow where you can make a base surface for an object in a sub-d modeling program and then bring it into MoI to continue working on it with CAD tools.