Is there a way to have two separate options for tolerance in Rhino, a custom one for the “Split” and “Trim” tools only, and a default one for the Absilute tolerance used with all the rest commands?
For example, the “Split and Trim” tolerance could be 10 or 100 times more accurate than the default one:
If “Default tolerance” = 0.01 mm
then “Split and Trim tolerance” = 0.0001 mm
This also could be applied to the “Project” tool, because projected curves are often used as trimming objects as well.
When using curves or surfaces to split surfaces, Rhino sometimes tends to project them improperly (even in the parallel views), thus it splits the surface in a slightly deviated area. That may produce eventual errors and even creation of a bad object. It happens when I want the new cutting line to be very close to the border of a surface, especially if they are at a very small angle. To make a perfectly accurate split and avoid errors, I temporarily increase the tolerance from “Rhino options > Units > Absolute tolerance” from 0.01 mm to 0.001 or 0.0001 mm. After I complete the splitting, I revert to the original tolerance. It would be nice if Rhino uses more accurate tolerances only for the split/cut commands, while keeping the absolute tolerance for the other commands at their default.
PS: I already described the issue at this post What rhino commands do you use on a regular basis and think others don't know about? but the reason I post this in a separate topic is that it’s essential for the program to split/trim the surfaces properly, in order to avoid further issues that are the result of inaccurate splitting/trimming.