In the previous section we obtained a coarser mesh from the example file. In some cases, the result is one where the resultant triangles become quite elongated
and, depending on later use, the surfaces are not as they were intended to be. For this purpose, it is possible to use the Remesh tool from the Bodies Tab.
We will start off with the same mesh as before:
- Import through File > (Recent file): lady_shell_tutorial5.stl
- Switch to the Bodies tab
- Enable the Edge View (Alt+E), review the state of the data
- Click on Simplify
- Select Absolute, Size = 5000 and click 'Apply' to make the changes permanent without first generating a preview
- Now Click on the Remesh tool (or simply change the tab in the Options section on the left side)
There are a few options here that need explaining. The 'Factor' defines how much movement is allowed per iteration of the mesh. This value needs to be greater than 0 and
less than one. The number of 'Iterations' is simply how often the process is to be applied. Generally, it is better to use a smaller factor for each iteration with more
iterations. They do not need to add up to any specific value, but the defaults are a good starting point. If the mesh is very large to start with, it is recommended
to perform this one iteration at a time so that the mesh size can be observed (depending on the values more or less triangles remain after the completion so if
it constantly increases, the mesh can become very large and potentially crash the computer).
The 'Len' option is to use a computed target edge length (edges longer than this are targeted for splitting, shorter ones are targeted for merging) such
as the default Average Edge, Minimum or Maximum Edge Length. Note that, if you choose one of these computed values and then switch to the 'Value' option from the same drop down, the
field will provide what this last value was set at. In this example you can first select 'Avg. Edge' and then select 'Value' to find out that the average
edge length is 4.35499 (assuming mm for work and import units). Similarly, the Maximum Edge length is 24.33951 and the Minimum Edge is 0.90937.
As we want to keep the overall number of triangles (currently at 5,000) approximately the same, we will opt for the Avg. Edge length. All other options are kept
at their defaults. Click Preview and you will see the resultant mesh:
It should be noted that the remeshing moves away from the original shape of the object, it attempts to create 'better' shaped triangles in favor of
keeping the locations and shapes close to where it started from. Whether or not this is a useful step in your process greatly depends on what you
are working on. Please also see the Remesh Help Page for details on options.
We will look at a few more things we can do with this in the next sections...