Hi, I'm learning Houidini and reading the online tutorial “Working with Particle”.(There is a rocket with particles.)
When I rendered the custom shader “smoke” with the lighting model “Lambertian”, H13 was rendering very slowly.

Is it possible to figure out the problem?

Thank you.

Tony

Do you have a scene you can upload?

You can download the scene to take a look.

Just appears to be a bug in the system - as the Lam. model works fine for normal geo.

You can submit a bug via the Support menu above. Thanks!

Thank you, MartybNz.
I will do what you mentioned.

Tony