Hi
I remember when mantra creating displaced geometry is multithreaded in h13,but in h14 it signal thread .

Can I set it back ?

If you have an example file that demonstrates this, I'd recommend sending it into support.

Hi
Thank you edward,here is a simple file.

luoqiulin
Hi
Thank you edward,here is a simple file.

Thanks for the example. This should be significantly better in tomorrow's daily build.

In H14 mantra looks at primitives which have very large or very loose bounds and automatically pre-dices these primitives to get tighter bounds on the acceleration structures. The extreme displacement on the sphere was triggering this behaviour.