Fusion wastes huge amounts of time recalculating irrelevant stuff

[wesley.freeman]

Early in my timeline I import a complex organic 3D scan as nurbs patches from Geomagic. I prep it by stitching it, slicing off the bits I don't need and positioning it. I will later boolean it out of my 'native' Fusion parametric geometry. While modelling that native stuff the scan component is just there as visual reference as a separate component.

After a while I find that editing almost anything in the timeline of my 'native' components causes huge delays recalculating the timeline, including operations like recalculating the nurbs patch stitching - why? I made no change to that component and the only deliberate reference or link between that component and the 'native' ones is the boolean at the end of the timeline which is suppressed. 

I now have to wait ~5 mins just to adjust a line in a simple sketch. Everything recalculates when I ask to edit the feature, and again when I apply the change.  (10th gen i7 with 16GB RAM, Fusion using ~4GB) 

I will try to get around this by using a simplified mesh placeholder while modelling and bring the proper converted object in as late as possible, but I shouldn't have to bodge around it like this. It seems like there's a bug or design fault here.

[TheCADWhisperer]

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[jeff_strater]

without a design to look at, I can only speculate.  There may well be a bug there, but I can't tell.  However, one possibly useful technique here is to use "Convert to DM Feature":

The "DM" here is "Direct Modeling".  If you use this command, all "upstream" features of the selected features will be deleted from the timeline, and the body will be replaced by a "base body" feature.  In your case, I would take the the last feature in your set of "prep" features (stitching, trimming, positioning), and convert that to a DM feature, on the assumption that, once all this fixup is done, it never has to be re-calculated, and you will not be editing the NURBS patches that make up your imported data.  Then, any features downstream of that will compute without having to redo all the stitching, trimming, etc.

[wesley.freeman]

I get around this now by doing things in stages in different files, i.e. do all the mesh -> t-spline -> BREP stuff in another file and export the finished product to a fresh design. Much smoother.