Question of Transmission shadow

[llllllleo27]

Hi，I'm using Moonray v1.3 with Houdini 19.5.640 in Rocky 9.2.
In my test render that shadow of colored glass is just black.This‘s what I got：

But in Documentation, I found this

This should be correct, right?

As same time it shows warning and error:

Warning (lib.render): /materials/DwaRefractiveMaterial1/DwaRefractiveMaterial1.iridescence_interpolations: cannot convert TfToken to IntVector
Error: /materials/DwaRefractiveMaterial1/DwaRefractiveMaterial1.iridescence_interpolations: cannot convert TfToken to IntVector

I guess this could be the reason？And wonder how to fix that.
If not,what settings should I change to adjust shadows？（I have try some，but not work）

Look forward to your advice.

[kjeffery]

Caustics are off by default to reduce noise. You will need to enable caustics. Look for casts_caustics in your material.

Another option is to use presence instead of transmission, but it's not physically plausible.

[llllllleo27]

Thank you for your reply. And I want to know if it doesn't matter？

Warning (lib.render): /materials/DwaRefractiveMaterial1/DwaRefractiveMaterial1.iridescence_interpolations: cannot convert TfToken to IntVector
Error: /materials/DwaRefractiveMaterial1/DwaRefractiveMaterial1.iridescence_interpolations: cannot convert TfToken to IntVector

[kjeffery]

Since you're in Houdini, is it fair to assume you're using the Hydra interface?

We tried to reproduce your error with a DwaRefractiveMaterial with iridescence turned on but were unsuccessful.

[llllllleo27]

ok, that's strange.

1. I didn't turn on the iridescence when the error is displayed.
2. After turned on the iridescence it still work even it has an error.

I think maybe something wrong during the compilation process, I'll check.
Thank you for your help.