Cylindrical hard surface withouth pinching

Alexaurus3D · Feb 2021

Hello! I'm new here, so I'm sorry if this topic is repeated and sorry for my english.
I have a cylindrical mesh with a hole, but when I want to add support edges to make it more rectangular i have pinching as a result.
Which is the best approach to make this kind of hard surface without the pinching? I read in internet the best solution is to add more subdiv but I want to have a low poly mesh.

This is where I want to add the edge supports.

Image: https://us.v-cdn.net/5021068/uploads/editor/yt/tysp2we4g5uv.png

More context of the mesh.

Image: https://us.v-cdn.net/5021068/uploads/editor/4h/12zp2xuumn8q.png

Blue circle is what I want and the yellow rectangle is what I want to avoid.

Image: https://us.v-cdn.net/5021068/uploads/editor/xi/4opoz8vlvf6d.png

Thanks in advance!

Ghogiel · Feb 2021

the brute force way is have more loops in the vertical cylinder the rectangle is cut into and using the inset method so as to use the existing loops as some of the support loops.

After insetting the rectangle, add support loops. I added some extra support loops (red) on top of this set up to hide the minor warping, I did that because I wanted to use edge constrain and slide the purple loops tighter to the rectangular cut out.

gnoop · Feb 2021

You don't need extra loops . Neither so hi res cylinders. You just have to project vertex normals from a cylinder without hole . it's a main reason why projecting vertex normals from one object to another exists.

Alexaurus3D · Feb 2021

Ghogiel said:

the brute force way is have more loops in the vertical cylinder the rectangle is cut into and using the inset method so as to use the existing loops as some of the support loops.

After insetting the rectangle, add support loops. I added some extra support loops (red) on top of this set up to hide the minor warping, I did that because I wanted to use edge constrain and slide the purple loops tighter to the rectangular cut out.

Hi! Thanks for the repy! I will try this method, looks very clear now! Thank you!

Alexaurus3D · Feb 2021

gnoop said:

You don't need extra loops . Neither so hi res cylinders. You just have to project vertex normals from a cylinder without hole . it's a main reason why projecting vertex normals from one object to another exists.

By this you mean like baking a high poly onto a low poly? I'm a noob, sorry.

gnoop · Feb 2021

Alexaurus3D said:

By this you mean like baking a high poly onto a low poly? I'm a noob, sorry.

It may be just your initial cylindrical object before you did the hole .The one that you think has perfectly ok shadings without artifacts. But yes, in many cases its easier to transfer vertex normals from hi poly object.

Baking usually assumes per pixel baking into textures. It's not what I mean . I am not Maya user but as I recall it's called "Attribute transfer" in MAya . So it's "transfer" rather than "baking" Kind of projection of source object vertex normals to target one.

It's vertex normals that make surface shading so you always can edit them directly instead of extra loops. In case of that hole you could just make hard edge /split vertex normals (whatever it's called in Maya) and copy/paste vertex normals from where a vertex normal is in right direction . I do so in Blender ( pretty sure Maya should has the option too) So sometimes you can quickly cope with that even without "transfer"

ps. All this is relevant to low poly in game meshes only. If you use subdivision modelling for offline rendering then yes, extra loops is a right way.

Cylindrical hard surface withouth pinching

Replies