
This task will show you how to optimize an existing mesh,
i.e. redistribute and reshape the triangles within the mesh.
This way you will obtain a more homogeneous mesh, e.g. for analysis purpose. 

 Be aware that this optimization tends to modify the shape of the
model!
 The mesh must be exempt of Non Manifold problems,
even on nonactive areas.
You should use the Mesh Cleaner.
 Mesh Optimize is an iterative operator using edge splits and edge
collapses. If an edge is too long, it is split in two.
If an edge is too short it is collapsed. Consequently, there is a minimum
ratio between the minimum and
maximum edge length; otherwise an edge that has just been split could be
collapsed at the next step and
then split again and so on.




Open the
SmoothMesh01.CATPart from the samples directory.
You may want to display the triangles of the mesh, using the
Cloud Display command. 


Click Optimize
and select the mesh.

Set the Minimum
Length, Maximum Length
and Dihedral Angle
according to your needs.

 Minimum Length and Maximum Length refer to
the length of the edges of the triangles.
 The Minimum Length must be less than or equal to the
half of the Maximum Length.
 Dihedral Angle: The dihedral angle between 2
triangles sharing an edge is the angle
between their normals (note that this is different from the angle
across the common edge).
A greater dihedral angle indicates a sharp feature across that edge

for example if the dihedral angle is 0 it means that the 2 triangles
are on the same plane.
 All the triangles with edges shorter than the Minimum
Length will be collapsed so that
their edges reach this Minimum Length.
 All the triangles with edges larger than the Maximum Length
will be refined so that
their edges reach this Maximum Length.
 Al the triangles with an Dihedral Angle lower than
the value given will be flipped.
 Make sure the chosen values are coherent with your model.


Select the Analysis
check box to display the maximum and the mean deviations
(distances between a vertex and its initial position) in the dialog box.

Click Apply.

Click OK to validate the optimization and
modify the initial mesh,
or Cancel to exit the action without any modification.

