Dear
I have a question. Since, 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 NURBS surfaces by their differences in the elevations (maybe as it shows by the color for the height differences between the two NURBS surface)?
I would be thankful if you may guide me in this process
Thanks for your response
Regards
Amir Farshadfar
Here’s a method that might work for you - I’ve used this in a lot of reverse engineering cases. The PointDeviation tool will allow you to compare a surface to a set of points - in this case - a mesh. So, you can take one of your surfaces, and turn it into a mesh using Mesh From NURBS Object. You’ll want to tweak your mesh settings to make sure you’re getting an accurate enough mesh. Once you have your mesh and the surface you want to compare it to, you can feed them both into PointDeviation and get the color map like you show - you’ll need to set the values appropriately but it does a really nice job.
-Sky
Dear
Thanks so much for your guidance. Can you give more details about your method? I did not find the option “Mesh From NURBS Object”, but there is a option “mesh to NURB”. In addition, there is option “Mesh from surface/poly surface”. Which one should I use?
I have two NURBS surfaces (picture 01). Should I convert one of the NURB surface using the option “Mesh from surface/poly surface” into a mesh surface and then use the option “point deviation” and select both of my NURB and mesh surfaces? If I did it, it shows me just some points with the option “bad point” or “good point” (picture 02), but it is not the same as the picture I sent for you in the previous message? The option “apply” is also inactive in this window! Is this what you were talking about?
I also attached my two NURB surface, maybe it could be helpful.
I would be thankful if you may guide me in this field and give more details
Thanks so much for your response
Sincerely
Amir Farshadfar
kriging iges.stp (289.6 KB)
kriging solid.dxf (384.1 KB)
In the Mesh drop down you should see this:
Correct - the key here is to take ONE of your surfaces (doesn’t matter which one) and convert it to a mesh. Then you have a mesh of one surface, and your other surface to compare it to.
You might not be getting any color maps on the PointDeviation tool if the difference between the two is greater than the “Ignore” value. You’ll need to set the “Good point,” “Bad point” and “Ignore” values to something relevant to your particular project - these are highly dependent on the project so I can’t really give much guidance there.
