Pulling surface control points to the 3d scan mesh

Do you know any way to pull automatically CP to the mesh. I know that I could have more spare CP grid
but I would like to exact shape of the scan.

Hi Marcin,

Can you explain why you need it to be the exact shape?

A reverse engineering tool like Mesh2Surface (a Rhino plugin), Cyborg3D (previously PowerNurbs) or DesignX may be able to accomplish this.

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Hello - the workaround is to select the mesh points that are under the surface, run Patch and select the surface as the ‘Starting surface’ for the patch…

-Pascal

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very nice :slight_smile: I tried it earlier today but I had some strange output but after your post, I tried again and it worked :slight_smile:

Why this is named patch not pull? What is the difference between them (except the main difference which is that you can`t pull the surface to the mesh :wink: )?

Hello - it is not pulling - you can pull control points to the mesh (Pull command) but that will not put the surface itself on the mesh in most cases - Patch attempts to fit the surface to the mesh points - I guessed that is what you want but if not, just use Pull

-Pascal

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No, you said well. Thanks. I needed a patch with starting surface. Just asking to understand the difference.

I don`t know why but without tick-on: “Preserve edges” the whole surface goes crazy. How to use that patch->starting surface without preserving edges? Is that possible?

I own a 3d scanner and a Rhino license. I can’t afford Mesh2Surface and DesignX right now. I would like to buy them in future but for now, I can’t. So I`m trying to do as much as possible with pure Rhino.

I need an exact shape because I designed a part of the bumper which will fit into the old design (old tuning school facia replacement - new face, old montages).

I already tried retopo with pure subd and it’s too far from the original shape so I think that PowerNurbs won’t be perfect in that case. I`ve thought to try with surfaces.

You may see my 3d scans here:

My subd modeling:

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Hi Marcin,

You have to build clean curves and surfaces in Rhino. You won’t be able to use the mesh directly.

I think your approach need to be modified, you want the cleanest result with accuracy to the scan as a secondary factor. The more control points you have the sloppier the result will be.
A reverse engineering tool will allow you generate cleaner surfaces with less effort and be more accurate to the surface.

I think that the patch tool has big power also to build surfaces with denser CP count.

You don’t want a denser CP count because it won’t be smooth if you are using a mesh to generate the patch.

Hehe, my English is not so good. I’ve thought sparse but I`ve written denser.