How to skip tracing hair

[ono]

Hi all,

I'm trying to find a way to make ray skip hairs to find light sources around hairs.

It is simple to ignore hairs by writing a custom hair shader that just calls mi_trace_continue, but if there is a bunch of hairs in the scene, it soon results in stack overflow (or lacking of trace depth).

Another idea is to use mi_trace_probe_x with appropriate trace flag, but in my experiment, mi_trace_probe_x hits hairs even if trace flag is zero.

Is there any way to achieve this goal?

Thanks in advance.

[bart]

Light sources? Do you mean indirect light sources, or light from objects? Or light from visible area lights?

I assume so, because direct lights are easy to work with. And by using user ibl env, an environment can become a direct light.

We're looking into the hair flag issue with mi_trace_probe_x, as that was reported in another thread recently.

[ono]

Thanks bart,

By light sources, I mean indirect light sources.

When I was testing mi_trace_probe_x, I couldn't find any thread in this forum regarding to both hairs and mi_trace_probe_x.
I'd appreciate it if you let me know about the thread.

[Puppet]

It's old mr bug with mib_continue + hair.
You may view some possible workaround here:
http://forum.mentalimages.com/showthread.php?5224