The inserts are actually two things:
- an insert "hole" model for each insert. Similar to the ornament hole model only in the shape of each insert. This is actually made as a bulb light, but it can be an ornament,etc. You can see similar on SLAMT1LT's T2 that used
@polygame's inserts that did similar
- then I add a flat bulb model with the texture image of the insert (and bump map) and recess this inside the insert hole. This can either be a square shape, or in the shape of the insert hole. You just need to make the texture sized to work correctly with it
I did it this way so I could use the "walls / wood" inside the insert holes for the fire effects on Silent Hill and the Tron effects on RF2. You can use actual insert models inside the hole too, but it comes down to what works easer in the long run to get the look you want.
The insert images can be found at VPU:
Reupload from VPinball!
vpuniverse.com
...and these are actual jewel meshes:
Reupload from Vpinball!
vpuniverse.com