T-Splines
T-Splines

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7/09 Creating stunning jewelry designs with T-Splines View
5/07 How to approach modeling with T-Splines View
3/07 Carl Bass reintroduces T-Splines for Rhino View
6/21 Transitioning from NURBS to T-Splines View
12/07 Footwear modeling with T-Splines 3.3 for Rhino View
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10/28 How T-Splines changed my aproach to making jewelry in CAD View
09/29 Modeling a water gun View
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06/08 T-Splines for Rhino intro View

Torn/Stretched Surface -Need Topology Help

A support and feedback forum for Autodesk T-Splines Plug-in for Rhino users.

Torn/Stretched Surface -Need Topology Help

Postby goldenfab » Mon May 23, 2016 11:48 am

Hi,

I'm checking out the T-Spline Demo for Rhino. I'm trying to model a fairly complex shape (its the inside core cavity for a sand casting). I started out with an existing solid .stp file which has a lot of untrimmed surfaces and sharp edges. It seems there is no good way to automatically convert to a T-Spline. So started manually drafting out the topology in Fusion 360 (with T-Splines) until I somehow managed to reveres the surface normals of the same body. Anyways, I was able to export the control frame as a .obj and import to Rhino and got it mostly working. However with my current setup (i7-4790k and 8GB of RAM) my pc is really getting bogged down. So I started deleting edges to hopefully lighten up the model so I can work on it some more.

1st Question
Now that I have deleted a fair amount of detail, when I toggle to smooth mode the surface has a lot of streaking tearing going on, see screenshot below. What am I doing wrong? Here is a copy of the file http://www.goldenfab.com/temp_share/T-Spline_Tearing.tsm

Image

2nd Question
In the process of deleting detail, the program would not let me delete some edges leaving me with what I would assume is really poor topology. I'm guessing it has something to do with the rules of Star Points and T points. What is the best way to fix this?
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Re: Torn/Stretched Surface -Need Topology Help

Postby JSantocono » Tue May 24, 2016 10:19 am

Hi Goldenfab.

goldenfab wrote:I'm checking out the T-Spline Demo for Rhino. I'm trying to model a fairly complex shape (its the inside core cavity for a sand casting). I started out with an existing solid .stp file which has a lot of untrimmed surfaces and sharp edges. It seems there is no good way to automatically convert to a T-Spline. So started manually drafting out the topology in Fusion 360 (with T-Splines) until I somehow managed to reveres the surface normals of the same body. Anyways, I was able to export the control frame as a .obj and import to Rhino and got it mostly working. However with my current setup (i7-4790k and 8GB of RAM) my pc is really getting bogged down. So I started deleting edges to hopefully lighten up the model so I can work on it some more.

I would say that surface is to complex for a "first project" with T-Splines. :shock:
Is pretty hard from the topological point of view too. You need to understand very well T-Splines topology in order to pull it out...
Anyway, I can see on the screenshot that there are a lot of redundant topology, unnecessary StarPoints and T-Points, and abusive Ngons. This is probably the reason your pc is bogged down. You can try to improve it by setting the display setting at minimun (tsOptions :tsOptions: ), but you need to clean up the topology.

goldenfab wrote:1st Question
Now that I have deleted a fair amount of detail, when I toggle to smooth mode the surface has a lot of streaking tearing going on, see screenshot below. What am I doing wrong? Here is a copy of the file http://www.goldenfab.com/temp_share/T-S ... earing.tsm

For some reason I can not download the file. I guess you need to compress it before uploading.
The reason is what I mentioned above. Too much bad topology. You need to try to resolve the shape (topology) with 4 sided faces as much as you can. Use StarPoints only when necessary, and DON'T use T-Points until you fully understand the rules on using both together.

goldenfab wrote:2nd Question
In the process of deleting detail, the program would not let me delete some edges leaving me with what I would assume is really poor topology. I'm guessing it has something to do with the rules of Star Points and T points. What is the best way to fix this?

Yes, it has to do with that.
There is no unique way to fix it. It depends on each element you want to delete, but as a general way you can use :tsLayout: and convert all T-Points to StarPoints... Then, you can try deleting.

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