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Lab talk, the good, the bad, and the ugly
Dental-CAD
Designing a Restoration: Free and Open Source
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<blockquote data-quote="patmo141" data-source="post: 27129" data-attributes="member: 2560"><p><strong>Snapping and Retopology</strong></p><p></p><p>So, I did my best in MeshLab, and couldn't get what I wanted just yet (a set of vertices which I could reliably know was the margin). Blender has two neat tools which show potential but I couldnt get those dialed in either. One is a simple snapping tool which will allow me to snap a vertex in one mesh, to a face, edge or vertex of another. This is really nice because it means that the resolutions of the meshes don't have to be equal. This works very well, but if we want to match the WHOLE margin at a level of detail which is clinically acceptable, then this is going to take a load of time (by hand) or require some programming to automate which is out of my league. Determined not to go to bed without a crown on a prep, I did do a margin by hand (30 or so vertices) just to have some results. I also figured I should make a little more eye candy to justify today's frustration so I put a mirror in there.</p><p></p><p>The other method is essentially the same as the "select visible" in MeshLab. It is called "retopology." the "retopo" tool will project one mesh onto another (like draping a sheet over an object). How fine the sheet is will determing how much detail. So, if I made a mesh with high resolution, looked down on the prep, Blender would project all the points down onto it (see image). This allows us to essentially take an impression at any resolution rather easily but then we are limited by the same setbacks as before. Furthermore, we are limited by the grid we project (thread count of the sheet) which can be a benefit or a setback. I'm still wanting something more organic, with less brute force, and less steps....</p><p>[ATTACH=full]996[/ATTACH][ATTACH=full]997[/ATTACH][ATTACH=full]998[/ATTACH]</p></blockquote><p></p>
[QUOTE="patmo141, post: 27129, member: 2560"] [b]Snapping and Retopology[/b] So, I did my best in MeshLab, and couldn't get what I wanted just yet (a set of vertices which I could reliably know was the margin). Blender has two neat tools which show potential but I couldnt get those dialed in either. One is a simple snapping tool which will allow me to snap a vertex in one mesh, to a face, edge or vertex of another. This is really nice because it means that the resolutions of the meshes don't have to be equal. This works very well, but if we want to match the WHOLE margin at a level of detail which is clinically acceptable, then this is going to take a load of time (by hand) or require some programming to automate which is out of my league. Determined not to go to bed without a crown on a prep, I did do a margin by hand (30 or so vertices) just to have some results. I also figured I should make a little more eye candy to justify today's frustration so I put a mirror in there. The other method is essentially the same as the "select visible" in MeshLab. It is called "retopology." the "retopo" tool will project one mesh onto another (like draping a sheet over an object). How fine the sheet is will determing how much detail. So, if I made a mesh with high resolution, looked down on the prep, Blender would project all the points down onto it (see image). This allows us to essentially take an impression at any resolution rather easily but then we are limited by the same setbacks as before. Furthermore, we are limited by the grid we project (thread count of the sheet) which can be a benefit or a setback. I'm still wanting something more organic, with less brute force, and less steps.... [ATTACH=full]996[/ATTACH][ATTACH=full]997[/ATTACH][ATTACH=full]998[/ATTACH] [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
Designing a Restoration: Free and Open Source
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