Subdividing causes Bugsplat

lapx

Can anyone figure out why this will not subdivide and smooth?
The shape was created in cad and brought into SU and edited using edge tools and weld.Soap bubble was used to created the bulge.
Get bugsplats each time when trying to smooth w SSD (1 iteration). Something very strange going on

ssdtest.skp

Rich O Brien

Bad mesh

Results of Validity Check.

Edge parent for CEdge (7823) does not match Face parent in CFace (3078) - fixed
CLoop (4947) does not reference CFace (4946) - fixed
CLoop (4947) does not reference CFace (5632) - fixed
Edge parent for CEdge (3162) does not match Face parent in CFace (7814) - fixed
Edge parent for CEdge (935) does not match Face parent in CFace (7814) - fixed
Edge parent for CEdge (7823) does not match Face parent in CFace (7820) - fixed
Edge parent for CEdge (3122) does not match Face parent in CFace (7820) - fixed
The entity at address 63a6c30 has an invalid id (-7826)
Entity CFace (-7826) should be erased - done

lapx

Rich can you explain what a bad mesh is and how one could avoid it? How might it have occurred? What's the fix?

Rich O Brien

If you use Windows > Model Info > Fix Problems you'll get the results from the previous posts.

When things splat there's normally a good reason for it.

Your mesh is not a mesh that can Subdivide. Turn on hidden geometry. Look at the number of edges around the perimeter. If you select all the geometry look in the entity info box. There's 1221 entities which the majority are at the boundary.

When you subdivide you're dividing each triangle that are very close together. It won't work. You need a simpler shape that needs less think time. Large areas of your mesh triangles meet at one point which makes the subdivision very difficult.

You should watch Dale's Panton Chair tutorial on YouTube. It's shows how to start with proxy model in 2D and progress to 3D. Very educational use of SDS.

Holla back if you get stuck.