Id like to use the patch command to make quick 3D surfaces from extrusions. What good is the patch command if the the surface it creates leaves a wonky gap along its edge that should be connected to the extrusion it was created from?
I know I could plane cut the patch edge and then extrude down from that but then I would have to rebuild the whole model to fit it.
I tried join naked edges but it only works in small sections and is inconsistent.
Any thoughts appreciated.
Hi Matthew -
Untrim the patch surface, extend the extrusion through it, and trim them to each other.
Thank you for the response. I will try that.
I thought I was getting close with JOIN as the two edges are very close, but I can only select two small sections of edge to join, wondering if there is a way to select entire edges to join.
Untrim, extend extrusion, trim created even worse hole/ naked edge problems.
hello - it looks to me like the extrusion was not extended through the patch surface. Feel free to post the surfaces. You might also try Patch with a good deal denser spans setting - but it is not ever going to hit that edge cleanly all around, you’ll need to extend/trim. Or, SubD.
I thought to use join, but it will only let me select on small section of edge at a time. There must be a way to select the entire first edge then the entire second edge then join, right?
Any help appreciated.
File attached under image
helpedge.3dm (6.4 MB)
As far as creating a denser patch, PatchFor_helpedge.3dm (864.7 KB) was made in another CAD application. The trimmed surface is degree 5 x 5 surface with 174 x 144 control points, but the edge discrepancy from the rest of the polysurface is still up through 0.008. If you set the model’s tolerance to 0.004 (_DocumentProperties , then go to Units - Model - Absolute tolerance), you can join the polysurface and surface into a solid. After doing so, since the model has edges as short as 0.0014, it is best to then set the tolerance back to 0.001.
How will the model be used: rendering, export mesh for 3D printing, etc.? If you only need a mesh and need to make more of these, maybe someone has a script that can “bubble up” selected planar regions of a mesh.
I really-really would do this in SubD surfaces in V7 - even if you need to learn it from scratch, for this type of thing, it just makes no sense to use surfaces, with SubD available.
Thanks for the response. I will look into changing tolerance and joining into solid.
I will eventually want to export mesh for 3D print.
I think you’re right, I will dive further into subD.
This was suggested originally, but I didn’t fully grasp how to manipulate subD object. I was also fond of starting with a curve drawing which didn’t seem subD friendly but I’m working on it now.
Expect me back on the forum with new questions soon…
Thanks for your help Pascal, subD was the way to go. Still a little clumsy using subD, hopefully more tutorials will come out.
Great information in those links!