i need to know if there is any way to control the points in the point cloud.
1. either only import the point cloud in a polyline area i specify
2. add all the points within a boundary not limited to the pointclouddensity = 100, freaking default is 15 almost cost my job today. extremely stressed out right now.
i am talking about extreme lidar surveys. 1km 1km LAS/0.5m contours/xyz files times 355 of them. covers a 2km wide corridor. but i only need 100m wide after i define the road alignment. no need to have all the extra points.
right now i densify the heck out of it and end up like 5-12m points. decent but not good enough because the geotech is bitching about that accuracy is not good for some feasibility study.
or is there any software i can do this besides civil 3d.
what i want can also do is automate the 'add points to surface" under point cloud and have the software do multiple boundaries without having me baby it over the night. right now every click is 5 minutes and adds like 400k to 1 million points.
If your "point cloud" is a simply xyz file, just add it directly to your surface as a point file however, before you add it, define a polyline where you want the surface to have data and add that as a "Data Clip Boundary" prior to adding the data. This acts as a filter as the data is added to the surface, is the point within the boundary? If so, add it to the surface. If it isn't, skip that point.
1.5 million limit "per run". you can keep adding them.
good idea i can give this a try.
we have LAS and xyz. LAS i know has it all. but xyz not so sure. tried work computer can't handle xyz left it one weekend and came back monday and crashed.
didn't know what that data clip is for. something new to learn is good. never had to use it because the size was ok before
does anybody know if the "pointclouddensity" variable affect the data which has already been added to the surface?
say you set to 15% and it added some points to the surface but at 100% it will have a whole new set of points added in. does rebuild the surface help?
If you change the point cloud density, the surface will not indicate Out-of-date, but it will add the additional points if you rebuild. I'm not sure why the out of date indicator does not display.
Also, BrianHailey's advice should be heeded, although you should know that you can use a data clip boundary with either the external point xyz files or with points from point cloud. Draw the data boundary, create the surface, add data clip boundary before adding the cloud points to the surface.
If you have a choice of using the LAS to create a cloud and then adding that to the surface vs. using the xyz files to make the surface, use the xyz files. That keeps you from bogging AutoCAD down with a point cloud. The less you have inside the drawing file, the better (meaning faster.)
Good luck with your project,
Another reason to go with the raw data rather than creating a point cloud is you will get a lot more data in your surface. A point cloud will only add about 1 million points to your surface. In this day and age, (I personally have 32 GB RAM on my system), 1 million points is childs play.
you know what you are right.
i just tried some stuff which takes forever and crashes on the crappy 2.4ghz dual core xeon with 8gb ram on my awesome 3930k oc'ed to 4.5ghz.
something 5 minutes takes 5 seconds. things that can't rebuild will rebuild no crashes. there it proves that you need a computer that is decent to run civil 3d. the bigger company i go the crappier the computer gets. weird eh?
if i can get a week work done in a day on a faster computer you know something is wrong with the IT department.
i should take over. seriously learn what's going on with hardware first.
I am pretty disgusted with the point cloud utility for building surfaces. In my experience I have not been able to get it to utilize 100% point density regardless of the Density Display setting.
The way I use it is to first build a cloud (which takes forever), then display it at low density to determine it's extents. Next, layout data clip boundaries within the extents. Finally, create empty C3D surfaces, apply the clip boundaries to the definition (do this first!) and add the points from the .xyz files. This is the only way I have been able to get 100% fidelity from the source data.
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