When you measure the thickness of a Pointcloud data object, you cannot select a method to use. PC-DMIS automatically uses the Sphere method.
You can choose between two mathematical methods for computing the Thickness Colormap:
Ray Based Method
When you select the Ray Based method for a Mesh, PC-DMIS pierces the Mesh at each vertex along its normal to the opposing side. The software then uses the data within the Max Angle to calculate the thickness.
Sphere Method
When you select the Sphere method, PC-DMIS uses a maximum inscribed sphere to calculate the thickness between the two opposing sides.
For either method, if you select the Use the dimension color scale option and no data exists on the opposing side, PC-DMIS uses the No data color in that area. If you do not select the Use dimension color scale, you can define the No data color with the Edit Color Scale.
For details on editing the dimension color scale, see "Using the Dimension Colors Window (Dimension Colors Bar)" in the "Using Other Windows, Editors, and Tools" chapter of the PC-DMIS Core documentation.
For details on using the Edit Color Scale option, see "Edit the Color Scale" in this documentation.
More:
Compare to CAD Thickness Colormap
Show the Thickness Colormap in the Report
Thickness Colormap Annotations
Show Annotation Opposing Points