Pixyz, does it work

Jumbee

I have models in my hand that has lots of support loops and some of them are already subdivided. Also I got models from CAD softwares which has terrible topology. I need to optimize them fast for VR game production. Means I have to go very low poly. I need a tool for this. Does Pixyz software works better then decimation tools we already have in blender? 

thomasp

Have a look at Maya's reduce polygons tool. That seems to give the most control without simply creating a holy mess of triangles (you can restrict it to keep quads as much as possible and mask areas or weight paint the effect. It's pretty good for recreating the quad topology of subdivided meshes. But it can also work like other tools and simply output triangulated meshes.

Blender's decimate sadly is nothing special in comparison.

Noren

I don't have personal experience with Pixyz, so I can't tell you about any possible shortcomings, but I know people who tested it some years ago and were pretty impressed. However, it's quite expensive even for bigger studios, so they opted against it in the end. Might be worth it if you use it a lot, though. There is a trial available.

CAD stuff often comes with expliclit normals. For a quick and dirty reduction, you'll want a decimation tool that can preserve those. But that's usually like 50% to 75% until stuff gets funky, depending on source file format and model and still a pretty high polycount. "Very low poly" will still need (ideally manual) retopology or reduction and possibly projection/baking, especially if fidelity is important.

I think Eric Chadwick posted tipps for similar stuff recently, so he might be able to say more.

There are dedicated scripts to restore the control cage of subdivided meshes for various pieces of software out there, possibly for Blender as well.