Reorienting a Facet's u and v

General discussion
1

Dear Marton,

Since facets acquire a (u,v) coordinate system when they are created, any texture applied to them will inherit this coordinate system. Is it possible to rotate a facet's coordinate system after creation?

I often encounter facets where the (u,v) system is not aligned with the direction one would intuitively like. For example, I have a midplane of a cylindrical chamber lying along the axis of the cylinder, but due to a few ports which make the facet non-rectangular, the (u,v) system is at about a 30° angle to the cyliunder axis. The resulting texture plots require coordinate transformations to straighten them. 

If one could define (perhaps with two points, like when choosing an axis about which to rotate a facet) a new direction for either u or v, the resulting texture plots would require less post-processing.

Alternatively, can you explain the logic Molflow uses to choose (u,v) for a new facet? If one could choose the vertices for a new facet in a particular order and thereby set u and v as desired, that would solve part of the issue. It would not help with facets imported from an external CAD program.

Thanks for all your help.

Best,

Alec

2

Hello Alec,

Sorry for the slow reply, I'm out of office.

What you're looking for is the Facet / Shift Vertex command, which has the shortcut CTRL+H. It renumbers the vertices and as by default the U vector is pointing from vertex1 to vertex2 and V is perpendicular, as a result you reorient the U vector (and thus profiles and textures).

If you need further reorienting (between two vertices), you need the Facet/Rotate command but it is more tricky as it can affect adjacent facets.