Hello Michael,

I'm sorry if this has been both asked and answered already. If it has, maybe a shorter thread with just FAQs about the new version can be pinned.

I have a few questions I'd like to ask and issues with MOI 3.0 I'd like to report so that they're fixed in 4.0 :

1. MOI 3.0 sometimes has trouble properly importing some of my more complex .sat or .step models, even though the models loaded and displayed correctly in other software such as eDrawings 2019. Once imported, the CAD models would be missing surfaces or would have some surfaces distorted or snapped / joined to edges they shouldn't be joined to. And could also have disjointed edges as well. Can I provide samples to help ensure these issues are corrected in MOI 4.0? Here are a few examples :

a) the propeller.stp model you can download from here : https://grabcad.com/library/swept-blade-propeller-1

b) the cylindrical outer shell of the mould.quadlobe.toy.stp model you can download from here : https://grabcad.com/library/mould-for-the-plastic-toy-02-model-1 . It has a small orifice at the bottom which is supposed to allow fluid into the mould but when you open this in MOI 3.0 you get a flat square surface which plugs the inflow orifice.

If I export the model as a .sat file instead, it's much worse. The entire outer surface of the outer shell is missing.

I do all my modelling in a different CAD software and mainly only use MOI to export to .obj so reliable, correct export of CAD models really what I want most from MOI, above anything else. The only other operations I use MOI for are twist and flow.

2. Can I install MOI 4.0 alongside and separate from MOI 3.0 and not have it interfere with MOI 3.0 in any way, including not overwriting or changing MOI 3.0's configuration file? Otherwise I'd rather not switch to MOI 4.0 until the release version. I have the thread limit set to 1 and the undo levels to 0 to save memory so as to be able to import and export more complex models and meshes.

3. When exporting to .obj, without choosing to weld vertices, MOI 3.0 sometimes introduces unnecessary vertex duplication / seams.

Like with the flat bottom plate of this CAD model when you export it to .obj :

https://grabcad.com/library/impeller-design-12-1



or the flat bottom plate as well as center top curved surface of this CAD model, likewise when you export it to .obj :

https://grabcad.com/library/impeller-design-05-1





Normally, I export my models with vertex welding disabled and I also usually make use of both the 'avoid larger than' and 'avoid smaller than' options. Not sure if those constraints are forcing this behaviour to occur when it otherwise might not.

4. Is MOI 4.0 64 bit and can make use of more than 4 GB of memory?

5. What will be the upgrade price to MOI 4.0 for MOI 3.0 customers?

6. Any ETA on the release version of MOI 4.0 and the release version of MOI 5.0 ?