topic Re: Curvature problems in Fusion Design, Validate & Document Forum

Curvature problems

Anonymous — Mon, 27 Feb 2017 16:16:46 GMT

How could I fix these problems

I have tried in various ways

but it is impossible to have a uniform curvature

Re: Curvature problems

Anonymous — Mon, 27 Feb 2017 21:28:58 GMT

Try the Interpolate tool that is found under the Modify menu and set the Towards selection to Surface Points.

Re: Curvature problems

Anonymous — Tue, 28 Feb 2017 12:45:40 GMT

I tried
but the command interpolate will not be a good solution
it is better to "make uniform", but also what is not an acceptable result

Re: Curvature problems

PhilProcarioJr — Tue, 28 Feb 2017 14:29:46 GMT

@Anonymous

The reason your running into this problem is because of the star point you have on the corner. The mesh flow is not correct for the surface your trying to create.

One thing you can try is the export import .obj trick, that should help but your best course of action is to fix the mesh flow.

Re: Curvature problems

Anonymous — Tue, 28 Feb 2017 15:20:07 GMT

thanks for your advice
but do not solve my problems
1)whit the recommended subdivision can't seem to get the shape that I want
2)It is very difficult to stabilize the curvature of the surfaces
3)the discontinuity in the edges becomes high even with a very precise polygon

Re: Curvature problems

PhilProcarioJr — Tue, 28 Feb 2017 15:29:21 GMT

@Anonymous

You need to adjust your vertices with the curvature map turned on. That way you can see where the verts need to be to fix the curvature. Move the verts until the color becomes uniform.

I can see by the unsmoothed version of your T-Spline that they are not in the right place.

Also for this type of work you will definitely need to use the export import .obj trick...

Re: Curvature problems

PhilProcarioJr — Tue, 28 Feb 2017 15:33:04 GMT

Also your going to find it next to impossible to get proper curvature with that crease.

In cases like car bodies the hood and the fender should be separate and even if you want them as one piece right now use the offset tool for the sharp edge and not the crease tool.

The crease tool actually puts 3 vertices on top of each other (even though you can't see this) to create the crease and that wreaks havoc on your curvature.

Re: Curvature problems

Anonymous — Tue, 28 Feb 2017 15:49:25 GMT

I need a single surface, It is a plastic cover

I was hoping you could act like other software Like Maya
or CATIA IMA where you can adjust the curvature.

However, even breaking down into 2 parts the problem is not solved.
It needs a tool to adjust the curvature ramp, similar to a surface c3

I hope he can get a similar solution in the future

Thanks for your help

Re: Curvature problems

PhilProcarioJr — Tue, 28 Feb 2017 16:59:28 GMT

@Anonymous

Currently the tools just don't exist in Fusion so it's all manual work. It's a pain I know but it can be done it's just more work then most people want to invest.

I have already given the dev team desired tools and features as well as @cekuhnen suggestions...we shall see if they make it into Fusion.

For your desired use case you might be better of building your shell in the patch environment, a lot less work for the results your after.

Re: Curvature problems

cekuhnen — Tue, 28 Feb 2017 17:03:17 GMT

@Anonymous

Forget about using the curvature comb currently along T-Splines edges.

Project curves or cut the BREP surface to evaluate the comb on the surface where you want to.

Inherently because of TS degree limitations (fat internal geometry) you will never get a smooth comb.

So use the comb carefully but don't trust it too much.

In general TS surfaces however are pretty smooth and great - so trust your eye more.