topic Re: SubD hull planarize in Alias Forum

SubD hull planarize

arkadiy.kalina — Fri, 27 Mar 2020 11:15:49 GMT

Hello.

Is the simple way to planarize cvs of a Subdivisions without creating a flat surface? For excample, through 3 pts or planarize to view or thmth like this... Hull planarize tool doesn't work. Especially it is useful when work with symmetry. See screens below. If there is not the function, it would be great if you add it then.

Thank you!

Re: SubD hull planarize

shinji-pons — Sun, 29 Mar 2020 17:17:09 GMT

Hi,

Hull planarize will not work on SubDs since their U and V directions are not always explicit, unlike with NURB surfaces.

You might want to try out the Align to Curve tool inside of the Subdivision palette. This article on the AKN might help you.

Let me know if you have more questions.

Re: SubD hull planarize

arkadiy.kalina — Tue, 31 Mar 2020 07:12:58 GMT

Align to curve tool moves all CVs except for the first and the last ones. In some cases it is necessary to generate plane by 3 pts and move CVs by normal direction to it. The other way is to align CVs by moving them just in view in one coordinate by picking first and last. And other coordinates remain unchanged. The same to Hull planarize tool. If i remember, there is a same tool in Speedform.

Re: SubD hull planarize

stephan.pfoertner — Wed, 01 Apr 2020 08:03:46 GMT

Hi,
you are right, the generated curves by the 'Subdiv Align to Curve Tool' will in most cases move CV #2. But depending on your workflow, there might be other options:

1) Don't use 'Generate Curve' button, but create one by yourself that fits your needs and pick it in the 'Subdiv Align to Curve Tool' using the middle button 'Align To Curve'.

2) Use 'Subdiv Align to SURFACE' instead. Create a degree 1 flat plane by yourself that crosses the wanted CVs. It will be more or less perpendicular to your original Surface. Optionally restrict the projection direction to one axis in the tool options. Actually, surface (not curve) alignment is wanted quite often, even of you only want to align one row of CVs - but yes, the surface should be more or less perpendicular in these cases.

3) Use the 'Transform Tool' - this was enhanced in 2021 release. It works on control entities now (CVs/Edges/Faces) and provides some new feature. For you the most useful feature would be the adjustment of the manipulator's position and orientation: You can either use the normal 'Alias' way, to set the pivot onto CV#1 and then pick your CVs and and downscale along the corresponding axis. Or you can switch to 'Global' instead of 'Pivot' in the tool options. This way the Translation/Rotations/Scaling isn't driven by the object's pivot anymore. The manipulator will be placed in the middle of your selection by default now. However, you can adjust the position and orientation by pressing the 'Adjust Manipulator' button. You can now either manually orient the Manipulator, or you can pick objects, the Manipulator should align to (e.g. the subdiv edge between CV#1 and CV#2).

I hope that one of the proposed solution helps.

Stephan