Arnold 6 's much slower than Arnold 5 and wrong volume shading

[Suppybird.kingdom]

1. In my simple test, new Arnold is much slower on loading scene than previous version, 14s vs 2m10s. It's even much more slower in large scene.

2. When I render with 2 or more volume, the shader is wrong and appearing mosaic grid.

Link of the scene : https://drive.google.com/file/d/1JT4XFkxky9E4fxkA_hfXbuhvDIHjlk4b/view?usp=sharing

3. In volume vdb file, Velocity channel never work for Motion blur deform displacement , but it's still work with Turbulencefd standard render.

Hope develop team can fix this, thank you so much !

[Stephen.Blair]

Can you post your Arnold logs for the "slow loading" ?

[Nick_Niggler]

yep, same here, on Mac tried using Maya 2022, was almost double the time of a render to of Maya 2019...and the old Arnold...

[thiago.ize]

Can you post the verbose arnold logs from each version so we can see what's going on? The logs will tell us what step is slower.

[thiago.ize]

I think the volume slowdown was fixed in Arnold 6.0.4:

From https://docs.arnoldrenderer.com/display/A5ARP/6.0.4.0 we have this fix:

• #9595 Slow node update of VDB volumes on Windows and Linux even when volume did not change