I’m trying to split a polysurface that represents a body of water by using a plane and repeating this multiple times such that I can derive th 1133 VOLUMES.3dm (824.4 KB)
e volume at every 100mm of water drop but I cant seem to to figure out the work flow that will leave me with an enclosed solid or polysurface that I can then obtain the volume from (by exporting a STL to CloudCompare). A Split command (which won’t work using plane on the 740_CP Layer for some reason) leaves the top surface open and a Solid>Boolean Split joins the remaining model to the plane and the resulting volume analysis is incorrect by a huge amount.
The attached file has my water model in the Master Layer and a series of planes and I was hoping to be able to incrementally slice up the body to obtain a solid I could export to derive the volume.
Any advice on the correct work flow to achieve this would be much appreciated as I’m getting nowhere after a couple of days of trying. Thanks
Thanks, I didnt know about that command.
I created a box with the top surface at water level and ran the CutVolume command - it took around 10 minutes to complete but I eventually got a huge negative number :
This is why the BooleanSplit command - which is what normally should work - does not work correctly. There are a few naked edges in the water volume but they are hard to fix in-place…
Some of the problems are related to the fact that you are very far from the origin. I moved the object closer to the origin and then needed some complex steps to get it closed - there was a bad trim and some naked edges - but I finally managed, then moved it back to where it was before… Maybe it helps.
Thanks very much, I’ll take a look. Its good to know that a Boolean split command is the command of choice for this. I’ve just had a look at the ShowEdges command and I now see a few naked edges in the model but I fixing those is beyond my skills so thanks very much.
Sorry for the delay in replying - I had to install a demo copy of Rhino 8 (I only own Rhino 4) and I got stuck in a ‘No Valid License Found’ loop for several hours, but I eventually managed to get it installed so I could open the file you kindly provided. The repairs you made to the model have fixed the naked edges but unfortunately the Boolean Split command still fails on most of the planes so I resorted back to exporting the model as a SAT and doing the splitting and volume analysis using Autodesk Inventor. Thanks very much for your help, I think fixing the watertightness of the model is the important thing and something I need to learn how to do.