Material Properties Reporting Strange Values

Rhino.Inside Revit
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1

Hi Community,

I am trying to extract the physical properties of a material in Revit using Rhino.inside.

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What is interesting is that the units of Density or other properties do not match the values in Revit

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Any thoughts? I rhino.inside doing a conversion?

Rhino inside version that I am using

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Attached is the script as well. If anyone can help me figure it out that would be great. Thanks in advance!
Material Units.gh (10.9 KB)

2

Hi Rolando,

The easy answer… convert the kg/lbs

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What this actually involves:

Revit has a lot of possible unit types, RiR is outputting the Revit stored units.

Specifically:

  • Density in Revit is stored in kg/ft3 (kilograms per cubic feet)
  • UnitWeight is stored in kg/(ft2·s2) (kilograms per square foot per unit of acceleration)

When converting from these internal units to compatible units:

  • Density: It converts from kg/ft3 to kg/m3 (kilograms per cubic meter)
  • UnitWeight: It converts from kg/(ft2·s2) to kN/m3 (kilonewtons per cubic meter)

more details here…

https://thebuildingcoder.typepad.com/blog/2016/08/unitutils-converting-units-for-unit-weight.html

3

Hi Japhy,

Thanks for the response. This works!

4

@Japhy is there any documentation that shows what units Revit stores of is there a way to see what units RIR is reading from Revit. I am struggling with the Concrete Compression

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In this link it shows the posible units but it does not definitely say what are the stored units

5

This changed in 2023+ those versions

Is this something that could be handled in a Revit Schedule?

6

:rofl: :rofl: :rofl:
The most unexpected unit ever!

1 Like
7

here’s more information

The value is in Newtons per foot meter

https://help.autodesk.com/view/RVT/2024/ENU/?guid=Revit_API_Revit_API_Developers_Guide_Appendices_Material_Properties_Internal_Units_html

8

Thanks @Japhy this is gold!

:joy::joy::joy:

Autodesk!!! Who in the right mind will mix Metric with Imperial?

1 Like