Maximum Angle Build Definition - Not Weeding Correctly

[ceethreedee.com]

Maybe I am not understanding the concept correctly here. So help much appreciated.

Surface Properties -> Definition - > Build -> Use Maximum Angle

 

This feature should give you the ability to weed any triangles in your surface that have an angle greater than the specified angle.

Obviously for corridor models this is quite useful as they are built by almost parallel sections triangulating between one another. So anything outside this wonderful playground should stand out, like below.

For some reason though, when I apply a Maximum angle of 95deg it does not weed all the triangles. It leaves lots of them with angles greater than 95 deg. See below

Any ideas?

[tcorey]

Only exterior-facing angles that are adjacent an outer boundary will be eliminated. Perhaps on the right side, the exterior-most triangle, obscured by it's small size and the blue border, has no angle over 95 degrees? Certainly those other triangles should be removed if the outer-most is removed, but the process is iterative, starting at the exterior and working inward. If the exterior-most triangle does not qualify for elimination, others to the inside will not be eliminated, even if they include an angle that would otherwise qualify them.

[ceethreedee.com]

Well TCorey you are on the money... It is an iterative process, It seems civil 3D just can't deal with holes in surfaces? Except in the case of maximum triangle length?

• Build -> Max Triangle Angle - wont detect or create a hole See Link
• Pasting a surface with a hole into another surface - wont detect the hole See Link

Strangely though

• Build -> Max Triangle Length - Will create a hole 

For me this is a major workflow issue, as we design ponds with holes all the time!!! Boundary conditions are a lot simpler to define using max angle then max length, as sometimes links can be quite long on large embankments.

So my question is why does max length work anywhere? and max angle only work around the outer edge. Im hoping this is a bug and not a design choice.

CeeThreeDee

[tcorey]

This is not a bug and works as-designed.