(2022-07-03, 19:36)Lasse Deleuran Wrote: It does, using the "force" parameter that can be 8 and 48 for substituting for LO and HI res.
In the sample_part.htm file the buttons are uncommented, since I find it best to fetch the substituted primitives in advance (before building the 3D model).
Click on the yellow LO and HI res stud logo buttons to try it out: On 3022 here and observe how the substitution is forced in code using the force-parameter.
It's not turned on by default? The curves look smooth leading me to believe that smooth curved prims were being subbed in.