HtoA transmission behaves different than MtoA and Karma.

[AlexOddbratt]

It seems that transmission IOR is behaving incorrect with HtoA in Houdini solaris.

If I apply the glass preset, IOR 1.52, to a Arnold standard shader and do a render with MtoA and Karma with a materialX shader they look the same while the same shaders in HtoA gets a much higher amount of refraction.

I've attached images from MtoA and HtoA so you can see the refraction difference.

I've also attached a simple houdini debug scene.

I'm using:
- Windows 10.
- Houdini 19.5.716 and 19.5.752
- HtoA 6.2.3.3 and 6.2.4.0

[ralph.meijerNULX3]

Make sure your mesh in Solaris is double sided. You can add it with a mesh edit lop. MtoA seems to render standard with double sided on.