Import NURBS surface into Civil 3D

[amirfarshadfar]

Dear

I have a question. If I created two different NURBS surface in the Rhinoceros software and saved them in the format of the dxf or stp (or in other formats of the Rhinoceros available if needed), and imported them into the Civil 3D software, how could I use the option “TIN volume surface” to compare between two surface? I used the option “TIN volume surface”, but there is no option defined for these two imported surface and the option “select base surface” is empty without the definition of the imported surface (picture1) ? Is it basically applicable to import NURBS surface from Rhinoceros into Civil 3D software?

I would be thankful if you may guide me in this process

Thanks for your response

Sincerely

Amir Farshadfar

[Wojtek_Garczewski · Accepted solution]

NURB Surface is not a TIN Surface, and it will be not listed under Surface in Toolspace. 

You have to convert it to TIN Surface. Not sure what type of objects you are getting from Rhinoceros, so hard to guess, but you can create a TIN Surface based on AutoCAD drawing objects. 

If the object you got from Rihneceros is AutoCAD Surface (not TIN Surface), you may try to EXPLODE it to basic entities (e.g. 3D Faces) and use these to build TIN Surface. 

[amirfarshadfar]

Dear

Thanks so much for your responses. By considering the following video:

https://www.youtube.com/watch?v=QIwZhloTKes

It shows that by using the option “smooth surface”, the “kriging” or “Nofilter” surfaces are smoothed. I am using the Rhinoceros software to create a NURBS surface and import it into the Plaxis software (Bentley software) as a Numerical solution software to analyze the model. I create the NURBS surface because it decreases the time of calculations a lot and shorten the time of calculations considerably:

1 - Is the smoothen surface created by the mentioned method in the Civil 3D software have the same ability as the option NURBS surface does in the Rhinoceros software? What is the meaning of the “smooth surface” option in Civil 3D? Could I use it instead of the NURBS surface in other software to decrease my calculations?

2 - Is there any option in the Civil 3D software that I could use like a NURBS surface to decrease my calculations?

3 - In addition, it is very important for me to compare two different NURBS surface by their elevation differences, by considering your expertise in the drawings, is there any software that I could use to compare two different NURBS surface and has the option, something like the “TIN Volume Surface” option in the Civil 3D software, to compare my surfaces by their differences in elevations for NURBS surfaces? Does the Rhinoceros do that?

I would be thankful if you may guide me in this process

Thanks for your response

Regards

Amir Farshadfar

[amirfarshadfar]

Dear

Thanks for your response.

Like the ability of the “TIN volume surface” in the Civil 3D software that could compare two surfaces in the Z direction (elevation difference), does the Civil 3D software have any option to compare two surfaces in X and Y directions also?

If not, do you know any software that could compare the difference of two surfaces in X, Y and Z directions?

I would be thankful if you may please guide me,

Thanks for your response,

Best regards,

Amir Farshadfar