How to include a Grading Group in my surface

RalphBrown99 — Wed, 23 Jul 2025 00:23:20 GMT

Hi,

As the title says, I have already built the top surface of my parking lot based in 3D Polylines and apart I do have a Grading Group describing the slopes from the border of the parking lot to the original ground.

How to merge properly?

Can I add the Grading Group to the Surface based on the top of the parking lot? or

I tried to add the 3D Polylines/Feature lines on top to the Surface generated from the Grading Group. I ended up with a surface with empty spaces/holes.

Let me know if you it is clear enough.

Regards,

Ralph

Re: How to include a Grading Group in my surface

essam-salah — Wed, 23 Jul 2025 08:42:00 GMT

hi @RalphBrown99

what i understood from your post is that you have a TINSurface and you some Gradings and you want to merge em all in one surface, if this is the case try the following,

1- Create Detached Surfaces from the Gradings (check a pic below),

2- Create new empty Surface .

3- paste all TINSurfaces into the new surface (check a pic below).

topic Re: How to include a Grading Group in my surface in Civil 3D Forum

How to include a Grading Group in my surface

Re: How to include a Grading Group in my surface