Import TINsurface and use polylines as boundries for creating 3D solids

Civil 3D
1

I have a TINsurface and multiple closed polylines in my DWG. With the help of dynamo i want to create 3D solids from the TINsurface within the closed polylines. Can anybody help me

2

Hi @pim.sturm,

Your starting point will be these nodes:

image
image369×653 23.9 KB

From there, you should be able to use the nodes under Geometry > Solids > Solid to slice them up as needed using the polylines. For example, you could extrude the polylines as solids and then use Solid.Difference to get the overlap between the two.

3

Thank you for responding. I want to create solids with different depths.

4

@zachri.jensen @Anton_Huizinga here some more information.
In Civil3D 2025 i have some test geometry. A TINsurface for the elevation data. Some closed polylines that represent the new 2D design.
I want to create 3D solids with different depths inside the closed polylines. using the elevation of the TINsurface.

Civil3d tinsurface and 2d polylines
Civil3d tinsurface and 2d polylines1371×663 104 KB

TEST-TrimTINsurfaceInDynamo_2025-04-28_11-55-37
TEST-TrimTINsurfaceInDynamo_2025-04-28_11-55-375978×2236 856 KB

5

Dynamo solution
Dynamo solution991×636 74.7 KB

i found the solution by myself. the node i was missing is: geometry.IntersectAll

Thanks for the help @zachri.jensen