Weird mtoa error

[hitecom8172]

I recently installed maya 2020 and arnold works fine except this when i open a few car models which use to work with the beta i get this error:

// Error: [polymesh] /group1/HDM_05_003_chrome_noFBXASC045ms/HDM_05_003_chrome_noFBXASC045msShape: incorrectly defined UV coordinates, missing either uvlist or uvidxs //

What is this ive never got this error before. Also i did pre populate my gpu cache but in other scenes too it takes longer than it used to before to get to first pixel. this error that i mentioned above makes the models not work with the cpu or gpu. These models used to work before but they dont anymore.

[hitecom8172]

it seems like it happens in those scenes only i imported the fbx models with no previous materials and they render just fine.

[Stephen.Blair]

The UVs on those shapes are messed up. MtoA can't get valid UVs to give to Arnold

[hitecom8172]

it used to work before and it still does when i import the raw fbx files. they come from 2018. could that be a problem? i also have a shadow matte error can you help me out?

🙂