Coordinatebug in revit

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MalteHC
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Coordinatebug in revit

Post by MalteHC »

Hi all

I have a issue then you model in revit, and try to export the .dxf in shared coordinatesystem, there is a slight offset, i have read a bit at this issue and see that other people have the same problem, but only then thay are working in large coordinates.
My thought therefore is, that it must be possible to translate the pointcloud into a local system, before it gets imported into Revit, and use the traverse-transformation on the .dxf-file to get it back into the original coordinate system. Does anyone know in any softwares can do this?
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Re: Coordinatebug in revit

Post by 72RPG »

Hi

to be clear - you exported Revit model to .dxf and there is a offset compare to pointcloud data?
I am using Revit 2016 (and of course 2015/2014) and we are exporting Revit to naviswork and Glue 360 with no issues.
Can you explain more about this? I assume you developed Revit Model from Pointcloud data in large coordinates and exported back to .dxf a checked again the same pointcloud?

Yuri
MalteHC
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Re: Coordinatebug in revit

Post by MalteHC »

72RPG wrote:Hi

to be clear - you exported Revit model to .dxf and there is a offset compare to pointcloud data?
I am using Revit 2016 (and of course 2015/2014) and we are exporting Revit to naviswork and Glue 360 with no issues.
Can you explain more about this? I assume you developed Revit Model from Pointcloud data in large coordinates and exported back to .dxf a checked again the same pointcloud?

Yuri
I am working in large Coordinates in Revit and exporting in shared coordinates to a .dxf-file.
The dxf-file is beeing loaded into 3DReshaper and beeing inspspected according to the original E57 pointcloud.
But Revit sometimes offsets the model a couple of cm, as i have read, this is a wellknown fenomena, but it only appars woorking with large coordinates.
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Re: Coordinatebug in revit

Post by MalteHC »

72RPG wrote:Hi

to be clear - you exported Revit model to .dxf and there is a offset compare to pointcloud data?
I am using Revit 2016 (and of course 2015/2014) and we are exporting Revit to naviswork and Glue 360 with no issues.
Can you explain more about this? I assume you developed Revit Model from Pointcloud data in large coordinates and exported back to .dxf a checked again the same pointcloud?

Yuri
I am working in large Coordinates in Revit and exporting in shared coordinates to a .dxf-file.
The dxf-file is beeing loaded into 3DReshaper and beeing inspspected according to the original E57 pointcloud.
But Revit sometimes offsets the model a couple of cm, as i have read, this is a wellknown fenomena, but it only appars woorking with large coordinates.
72RPG
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Re: Coordinatebug in revit

Post by 72RPG »

Yes, this is the problem, Revit doesn't like "large"Coordinates. We use pointcloud data for validation mainly in Revit 2016 environment and I always exporting ReCap file in "local" coordinates- with origin in Revit Project base point.
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Re: Coordinatebug in revit

Post by MalteHC »

Can you export the pointcloud, with the same basepoint as the model?
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Re: Coordinatebug in revit

Post by MalteHC »

Is there any software, that can align a pointcloud to the dxf-file?
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Re: Coordinatebug in revit

Post by james.still »

easiest is to truncate the point cloud and then set up OS and local base points in revit.
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Re: Coordinatebug in revit

Post by jax120 »

This issue is not a coordinate bug but is actually a scaling issue. The larger the coordinate system the bigger the scaling issue. If you have a very large site then this can be a huge problem.

Previous posts are right though you have to assign your point cloud to a local coordinate system close to 0,0. This will mean any scaling is minute.

I am still unsure why this is still an issue when this had been corrected in rvt 2014 update 3. But all revit previously and since has had this scaling issue. I still do not understand why pointcloud insert of by shared coordinates is still there if it does not work.
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Re: Coordinatebug in revit

Post by jamesworrell »

Click on the point cloud in Revit and try "edit type" .. the precision for the scale factor is not sufficient .. that is why I reckon it happens. So you end up with a rounding issue - the cloud can drop in anywhere from mm out of position to 600 - 800mm.

The worst is when it is close .. we have one right now that is about 50mm out - close enough to be dangerous.
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