Is there any way to determine how revit calculate texture uv coordinates?

[shushenrui1996]

Hi. I'm using Revit API to export 3d geometry data from rvt files.  It's very easy to export mesh data and uv coordinates by OnPolymesh() method. But once I try to export geometry in a parametric way( using  OnFaceBegin() method to get faces and loops, and then triangulate them in my own brep renderer), it seems that I can not find a way to correctly calculate the uv coordinates from face modelling parameters and revit texture properties in my own brep renderer.

Is there anything I can do about this? Thanks!

[RPTHOMAS108]

The UV are the parameters across the surface no? They are not always measured in the units you expect perhaps.

Mathematical representation of face types | Revit | Autodesk Knowledge Network

It is probably just that the UVs are not in the units suitable for the sample size of the texture image. You would have to elaborate more on the results you are getting.

[jeremy_tammik · Accepted solution]

Maybe it will be useful taking a look at Hybrid Revit Families: Complex Organic Objects with Correct Texture Mapping:

  
https://www.autodesk.com/autodesk-university/article/Hybrid-Revit-Families-Complex-Organic-Objects-C...

Tablecloth in Revit

[shushenrui1996]

This helps a lot. Thank you very much!

[shushenrui1996]

 The unit is converted correctly so I wonder whether it's my uv mapping algorithm issue... Thanks for your reply!