Editable Terrain

Hi Lucas

with a terrain created from survey data you need to go to the Explorer > Survey, right click on the survey project and choose "Deactivate Survey Processing Rules"

https://communities.bentley.com/products/road___site_design/w/road_and_site_design__wiki/41718/what-are-terrain-model-rules

Hey Lucas:  Grzegorz is correct, assuming that you want to directly edit triangles.  I would suggest that you are not well served in doing so however.  Consider this:

1. You disable rules
2. You monkey with the terrain to do whatever (deleting the triangles in concave corners is most common need)
3. All is well right?
4. Then someone adds more survey data
5. What do you do? re-enable the rules thus destroying your edits?  Make a separate terrain model and then merge it with the original edited one?

Yeah, I know. Wait until the survey is 100% then edit.  But when is the last time you had a project that was ever "finished"? All to often we are continuing to add survey data right up to and sometimes during construction.

It is far better in the rules based world of OpenRoads to edit rules instead. Consider the most common need for a surveyor to edit the terrain model (remove triangles from the concave corners.) Here's what you do:

1. Process survey as normal
2. Oops, I have a bad corner.
3. Draw a smartline along the corner, snapping the surveyed points
4. Add the smartline as a boundary element
5. Continue processing survey as normal.

In this instance I needed to swap a line.  See attached pic.  Will it make or break this survey? Absolutely not.  Most of the time I use it to swap lines, create points that were missed in the field, but I'm 99% sure I know what is there, to "smooth" out the suvey, missed flow line.  Also to delete slivers around the edge causing goofy contour lines.

Your correct survey's don't every get done, just closer.

So, the solution to swap triangles without disabling the rules is just draw a short smartline similar to the red line in your image and add this as a breakline.

Sounds good.  Going from the old Geopak and Civil3d the terrain was not locked down like that.  The rules were used during creation of the surface.  Then any edits could be made.