# Smoothing pinch points near crease intersections

I’m having trouble making clean models in SubD. Are there any threads or videos which cover this topic?

Couch.3dm (122.7 KB)

Your topology isn’t ideal for refinements. In general, I tend to model everything with quads and avoid triangles or polygons with 5 or 6 corners. Below is an example where I added rings where you need more definition. Also take a look at the corner and the continuity of the edges. As for the creased edge, I creased the segment to the back edge too, that looks better. Even better for a couch which never has a sharp edge would be more dense loops / rings where you want sharper edges.

Couch.3dm (211.3 KB)

1 Like

Thank you. That looks much better. Did you make that from scratch? I guess that is part of my problem, I don’t know how to go from what I had to what you have. I started modeling a polysurf then converted to a mesh then to a SubD.

I edited your model. Deleted some faces and stitched gaps back together, then added detail.

Creating the right topology takes practise.

The internet has a lot of information on topology. Here’s one link:

Topology Guides

1 Like

Example,

1 Like

I’m still struggling a little bit, and I am starting to question whether SubD is the best tool for this application
Attached is the corner type I am looking to create, but no mater how I crease the part I can’t seem to make that occur. I don’t think the corner in your model is bad it’s just a different style.

Unrelated, Is anyone familiar with the math that drives the corner softening? From looking at your part, it looks like the approximate radius of the corner is 1/4 of the distance to the nearest ring from the corner. Is that a safe rule of thumb?

If that’s the look you want to achieve, I’d model it in NURBS

SubD multipipe + SubD plane

1 Like

Hi inju

Good idea use Multipipe shape.
Thank’s for sharing~ : )

I tried to mimic the topology of the multipipe you showed. It looks a little better, still need some more refinement.

Unrelated, does anyone have any recommended studies for fairing SubD surfaces? I think I shot myself in the foot with the modeling path I took. The part needs to be removed from a mold so I need a minimum of 1.5deg of draft. I started modeling that way. I’m considering now, that it might have been smarter to model everything square and once I had everything organized and fair, then use a cage edit to add draft.