SubD examples and models

HornOxx

Hi - to get any first experiences I did a little testing, mainly based on Cottys SubD_04 model above. I was interested on how an existing texture behaves to the SubD process - it's amazing how confidently and fast that works ...

Cotty, how did you get this rainbow-colour on that subd23 chair which looks so great - is it texturing?

04 r.jpg

zipped skp2015 file

used texture

cotty

Nice! Here's the chair texture...

thomthom

@pilou said:

@unknownuser said:

this is because the QFT OBJ importer will ensure non-planar quads are created as QuadFaceTools quads

Sorry I don't see "Import OBJ" on the menus of QuadFaceTools(0.9.1 & 0.9.2) ?
Only "Export" ! (SU Make 2016 2015)

Ah, yea, the docs probably don't mention this at all, but it's listed among the other importers:

File > Import

The only reason the exporter isn't among the other exporter is that the API is lacking the interface. Them guys over at SketchUp should fix that! ...oh wait...

thomthom

@box said:

I've never ventured much into the realm of furniture making so as a first quick doodle I'm impressed by the ease with which I came up with something almost recognisable in less than 30 minutes fiddling. No doubt I could render it and make it look flash, but I love the raw topology.

It makes me very happy to hear that. My biggest concern with SUbD was how it relied on quad topology and I wasn't sure how well that requirement of workflow would be received in the realms on SketchUp.

thomthom

@hornoxx said:

Hi - to get any first experiences I did a little testing, mainly based on Cottys SubD_04 model above. I was interested on how an existing texture behaves to the SubD process - it's amazing how confidently and fast that works ...

Thanks for sharing that model - it's a nice study of geometry and texture.
At the moment SUbD use simple linear interpolation for the textures. However, I am working with integrating OpenSubdiv into a future release. That will give more options for textures;

Source: http://graphics.pixar.com/library/Geri/paper.pdf

pilou

@Thomthom

In fact all works fine!
It was half my fault! I was too confident of the first reading text!

cotty

pilou

Tron!

pilou

Glitch ?

SUbD finds internal faces and can't be apply! (Who don't exist)
(Artisan subdivides

subd_glitch_v6.skp

thomthom

SUbD Catmull-Clark algorithm require the mesh to be a manifold or a surface without any forks. That model you have there have an edge with four faces connected - the algorithm cannot handle that. In another modelling package where the entities didn't merge you'd get away with it as you could have overlapping edges. But since SU merges entities at all times these types of scenarios becomes a challenge.

OpenSubdiv 3 supports internal faces - maybe it would be able to cope with this as well - I'm not sure. But that's still down the line in the road map.

Box

It would be handy if either SubD or Solid inspector could highlight these annoying joints. They can be a real headache to find manually sometimes.

thomthom

Solid Inspector used to complain about these - but because they where considered false positives in many cases it was changed to ignore them.

I do have ideas for an analytical tool for QFT that will visualize quads from triangles and ngons. Maybe it can lightlight forks as well...

By the way, I tried the model on an experimental build I have where I try to wire up OpenSubdiv and it seemed to be able to cope with it:

OpenSubdiv experimental version

pilou

THx for the explanation and the effort!

panixia

@thomthom said:

I do have ideas for an analytical tool for QFT that will visualize quads from triangles and ngons.

please please auto-detect sausages ad donuts

somewere i should have a "wishlist" i wrote with some examples included too..

Box

Another quick late night doodle just for fun and to help wrap my head around quads.
It's very quick and simple but everything is so easy to manipulate with the combination of QFT, VT and SubD.

SubD Plane Proxy.skp