Extruding a rectangle into a Topo created surface

Hi guys

We have a 3D surface created from a 3D survey using Civil 3D. We need to work out the cut into the land. Basically its going to be a large rectangular cube in the ground. How is best to do this?

Cheers

Martin

Do you have access to Civil 3D or are you only using vanilla AutoCad?

I have full blown Civil 3D on my computer.

n anyone help with this please?

I have managed to push into the ground. I created a surface using the rectangle where the excavation is, and to the correct z level. And then pasted it into the topo surface. The only thing is, it has given the transition between surfaces a gradient, I need the faces from the existing level to proposed level to be vertical. Any ideas?

I need to work out the cut needed for the excavation.

Did you try using a wall breakline for your cube?

To figure the cut, you will need a second surface. From there it's a simple matter of using the Composite Volume calculator.

Did you try using a wall breakline for your cube?

How do i do this?

Should the cube be a 3d solid?

Please can someone help me on this, its quite urgent

Are you only trying to get the cut total, or to represent the cube on a plan?

A breakline is an object that interrupts a surface (hence the "break" part). It can be a wall or the rim of a pond. These days they may call it a feature line as well.

Grading is not my strong suit. What you probably need to do is create a polyline that represents the bottom of the cube, define it as a feature line at the appropriate elevation, create a surface, and define that surface as the interface of the feature line and the existing surface.

Are you only trying to get the cut total, or to represent the cube on a plan?

 

A breakline is an object that interrupts a surface (hence the "break" part). It can be a wall or the rim of a pond. These days they may call it a feature line as well.

So how do I make the breakline to give me the 4 walls of the excavation? Yes I am trying to work out the total cut volume.