Hello Rich O Brien,

Many thanks for your help.
The Topo-sk8.skp works well with toposhaper v2.6a in SketchUp 2021 (Win10).

I have tried some other skp files and find that if the geometry is rectangle, no errors will occur.

So I guess that there might be 2 situations for toposhaper smoothly running without errors:

1. the geometry is better in rectangle --- at least not too much acute or obtuse angles;
2. Not too much tiny contour lines near the edge of the geometry.
   Is that true?

Many thanks again!

@rich o brien said:

Try tidying up the border to help Toposhaper create a mesh...

[attachment=0:3akutcq8]<!-- ia0 -->Topo-sk8.skp<!-- ia0 -->[/attachment:3akutcq8]

I removed your outline and some pointless small edges and the BugSplat stops.

I also moved your raw geometry onto the default layer rather than your major/minor layers

Hello,

I am now using Sketchup Pro 2021, with TopoShaper v2.6a. Following the instructions to TopoShaper::IsoContours, when I try to generate terrain as Step 4, SketchUp crashed! No matter the grid set as default 50x48, or 200x198, crashed all the same!

I don't know why, and could anyone tell me if there is anything wrong?

My file Topo.skp is here (uploaded to Microsoft OneDrive for download):
https://1drv.ms/u/s!AvaTfkcj2ZSTijSdm9cz1fsnQNFr?e=gUdSXs

Please help and many thanks!