Segmenting point cloud and modeling walls in Revit

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neeravbm
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Segmenting point cloud and modeling walls in Revit

Post by neeravbm »

Hi,

I am just starting to learn how to convert point cloud of a building to a BIM model in Revit. From what I understand, we first need to define levels at floor and ceiling levels. Then create a thin section box somewhere between floor and ceiling levels and look at it from the top view to trace walls.

I have a few questions:
  • If I have a multi-storeyed building, I need to see each story in the elevation view and then mark each level. Is there an easier way to define levels?
  • While tracing over walls, there are lots of objects not belonging to a wall showing up in the view. Is there a way to hide such objects which are not flat, or which are flat but less than a certain size so that wall tracing becomes easier?
Thank you.

Regards,
Neerav.
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Re: Segmenting point cloud and modeling walls in Revit

Post by travistlo »

Why add Levels at the ceilings? Levels are for object attachments and construction documentation.

Create your project like you would a normal architectural project. Make your level, floor plans, ceiling plans, elevations. You will create sections as needed.

Your floor plans can be duplicated to give you various view ranges, so you can have one cut at 4' one at 6' , etc (or meters if you use). Our teams used 4' with a 6" cut plan for most conversions. This way we can tell the architect that all dimensions have been taken at 4' off the floor.

I work in "normals" color model, as its easier to see the planes. Use your photos to know What your modeling, use the point cloud to know where and what size to model. do not trust that you know what the points are showing without looking at the photos too.

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Re: Segmenting point cloud and modeling walls in Revit

Post by Matt Young »

I agree on the levels - you only need one level per floor. Everything on that floor (including the ceiling) will have an offset from it's associated level.
If you don't see that there is nothing, then you are kidding yourself.

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Re: Segmenting point cloud and modeling walls in Revit

Post by neeravbm »

Thanks, Travis and Matt. I'll follow the process based on your suggestion.
Neerav Mehta
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Re: Segmenting point cloud and modeling walls in Revit

Post by Oskokos »

While tracing over walls, there are lots of objects not belonging to a wall showing up in the view. Is there a way to hide such objects which are not flat, or which are flat but less than a certain size so that wall tracing becomes easier?
No, you cannot hide elements. And if the wall is not visible behind the element (for example, a tall cabinet), to build the wall you will have to change the cutting range.
As you have already been told, you need 1 level and change the offsets from it many times.
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