Reverse engineering sw

[davide445]

Have you got an image of the eyewear you can share?
For most reverse engineering applications (depending the reason for RE and the data format they require) you're using the mesh as your template/guide and cleaning the mesh serves little to no point. It will only make the data less accurate.

Attached the first test scan, only of the frontal part without the temples

[JSenior]

Attached the first test scan, only of the frontal part without the temples

For the basic shape you're going to want to create a surface over the front face and then draw around the profile of the glasses, project this on your surface and delete the excess. Once you have the basic curved shape the extrude it by x mm (assuming it is consistent) and can add some rads to the edges. If the lenses are recessed you can make a cutter using a section of what you've already created.

You can do this in Spaceclaim/Rhino/Most other solid modellers (It can be done in Designspark but creating the front face is difficult as there are no blend/surfacing tools.) There's no point trying in a mesh program however, as you won't get consistent sharp edges. Depending how clean your mesh is, you may want to smooth the front face to be able to create a smoother surface.

This will all take you time to learn however. When I purchased my first scanner (and I was using CAD before this) I spent 6 months doing no paid work before I was comfortable taking on clients projects.

[davide445]

For the basic shape you're going to want to create a surface over the front face and then draw around the profile of the glasses, project this on your surface and delete the excess. Once you have the basic curved shape the extrude it by x mm (assuming it is consistent) and can add some rads to the edges. If the lenses are recessed you can make a cutter using a section of what you've already created.

You can do this in Spaceclaim/Rhino/Most other solid modellers (It can be done in Designspark but creating the front face is difficult as there are no blend/surfacing tools.) There's no point trying in a mesh program however, as you won't get consistent sharp edges. Depending how clean your mesh is, you may want to smooth the front face to be able to create a smoother surface.

This will all take you time to learn however. When I purchased my first scanner (and I was using CAD before this) I spent 6 months doing no paid work before I was comfortable taking on clients projects.

Useful suggestions, thanks. Using SpaceClaim we will have RE tools available, using "clean" Rhino without any RE addon such as RhinoResurf or Mesh2Surface will be difficult? Trying to understand the most cost/effective investment for our learning, considering we are just starting.
We will probably proceed step by step, starting with just the scan and mesh preparation, and giving to colleagues the difficult reverse part and next learning how to.
A second project is a shark tooth (attached the first scan), a definitely more organic shape. We need later to print it in 3d: we will need also to pass trough a CAD and solid modelling or we can stay with the mesh and just give them a depth and make it watertight?

[JSenior]

Assuming they want a like for like model then no reason to put into CAD. Scan, mesh, fill the holes, smooth out any problems, align it to the world axis and then maybe cut a plane off the bottom and fill so it will sit flat.

[davide445]

Assuming they want a like for like model then no reason to put into CAD. Scan, mesh, fill the holes, smooth out any problems, align it to the world axis and then maybe cut a plane off the bottom and fill so it will sit flat.

In this case any suggestion for a good tool?
I think I did now understand the CAD topic, about mesh there are many more options, I did have on my laptop for testing Meshmixer, Netfabb Private, 3d-Coat, Meshlab, VRMesh Reverse, GOM Inspect, Cinema 4D, will need a lot of time just testing every of them.