In this scenario, the main following steps are executed:
If the scene contains CAD surfaces, meshes are created out of them. After this step, the scene contains only meshes
A decimation is run to decrease the polygon count of the meshes in the scene, whilst preserving a good visual aspect
Non-visible polygons are automatically removed (algo Hidden Removal)
Holes under 15-millimeter diameter are removed (algo Defeature)
All meshes are merged together to obtain a single mesh (algo Merge Parts)
According to the chosen option, material will be handled differently
About Material options
The scenario maintains visual aspect (diffuse color).
By default (option "Generate Diffuse Map" = No), the resulting phantom mesh has no material applied in its Material Property (Part or Occurence): a sub-material is applied on each patch of the mesh (or sub-mesh).
Basically the result is: 1 mesh + materials on patches.
Selecting "Generate Diffuse Map" option automatically calculates a diffuse texture map out of the color aspect of the original parts (baking based on UVs automatically generated).
A material, using the generated diffuse map, is automatically applied to the resulting phantom mesh in its Part "Material" property.
Basically, the result is: 1 mesh + [1 material + 1 diffuse map].
To go further
Refer to the Output window to check all the algorithms applied step-by-step during scenario execution.
Build and execute your own script by checking the equivalent Python script available in the "Sample Script Directory" (accessible from the Help menu).