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 âStarting surfaceâ for the patchâŚ
-Pascal
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very nice 
I tried it earlier today but I had some strange output but after your post, I tried again and it worked
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 
)?
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 PullâŚ
-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: âPreserve edgesâ 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 canât afford Mesh2Surface and DesignX right now. I would like to buy them in future but for now, I canât. 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 itâs too far from the original shape so I think that PowerNurbs wonât 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 wonât 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 donât want a denser CP count because it wonât be smooth if you are using a mesh to generate the patch.
Hehe, my English is not so good. Iâve thought sparse but I`ve written denser.