In case of topology optimization, the files produced by Tosca Structure.report
contain all optimization steps. In each step, only the elements with
the material value above a certain limit are displayed.
This limiting
value is set to 0.05 but it may be changed in the parameters to Tosca Structure.report:
in Tosca ANSA® environment,
it is the value of FILTER MIN field of CONTOUR_PLOT
PARAMETERS dialog.
The following figure shows the first and the last iterations of a
topology optimization: