template drop behaviour around sharp corners

Hi Michel. This is definitely an issue for corridors. For linear templates, you could maybe change the value for the Exterior Corner Sweep Angle. Try 01°00'00.0". It improved things... You might still need to use Point Control or Horizontal Feature Constraint though, to control the path of your exterior template point with a geometry line. See attached snapshot for an example

You can try using End condition exceptions to eliminate grading efforts within the overlap area. If part of the overlap occurs in the backbone, you might be able to define some point controls to limit overlapping segments. Finally, you might want to revert to site grading techniques where the road and curb are modeled with corridor or linear templates, but the sidewalk and grading is done using 2D Geometry with Profiles and then applied surface templates to define any pavement or grading materials.

What i'm trying to model is a small channel for a river.

Point conrols unfortunately don't help in this case, the closes i got is by inserting key stations.

I guess it's a case of working more or less as intended, but not as desired

I can see how that would be difficult programmatically because, if you assume a template is essentially perpendicular to the alignment, the "sharp corner" is extended "out" past the actual alignment. You are expecting that outer/left side to continue going beyond the alignment vertex. I agree there are situations where I might want to see that behavior, but I can understand that programming that logic, and finding a way to distinguish that from the standard behavior could be troublesome.

it should at least work with point controls no?

after all, it works in 2d with multilines.

bit more complicated with added z admittedly.

there could/should be a flag that would let you chose if you want to maintain width as defined in the template (rounded outside corner), or geometry as defined in the axis (sharp corners parallel to the axis)

also on the inside of the corner where things get squashed it's always going to be a problem.