rt use precalculated imap for gi.

[super gnu]

would be nice if you could load a saved imap and use it when viewing in rt...?

[vlado]

Yep, working on it...

Best regards,
Vlado

[3LP]

Nice!

I thought RT was only a "brute force mode"

So, how can you use irradiance map with rt?

Stan

[vlado]

The RT engine cannot do the prepasses; it goes straight to rendering. However it won't be a problem to use an already computed irradiance map.

Best regards,
Vlado

[3LP]

nice

so the RT would be only to "navigate through the scene?
Or could that be also used to change material without having the GI changed ? What somehow in for little tweaking does not case a problem, certainly if RT is only there for a quick preview?
Am I right ?

Stan

[vlado]

Of course you will be able to change materials; when using a saved map this won't affect the GI of course, but as you said, for minor tweaks it might not matter.

Best regards,
Vlado

[KAKTUSDIGITAL]

so what your potentially saying is that I could do a quick flythrough irrad map. switch to RTGPU, render out my animation and then take the rest of the week off coz you just saved me hours upon hours of cpu rendering time.

[vlado]

Well, we can only do the rendering part... The week off will be up to you

Best regards,
Vlado

[Alan Iglesias]

Ah, the hybriding of PPT and biased GI rendering on GPU...very exciting!

-Alan

[super gnu]

did this ever get developed?

id imagine vray rt gpu would be pretty fast if it was relieved of doing the gi calcs.

[vlado]

Yes, we implemented the light cache on the GPU for secondary bounces, but in the initial experiments it turned out to be quite slow and for the moment it is disabled. I hope we will be able to get back to that and see if it can be optimized.

Best regards,
Vlado

[3LP]

woaw, great news, hope you will have time to get back indeed,
Did you already tried to implement irradiance map on GPU, is that slow as well or not possible ?

Actually, if you achieve to implement IR and LC as well as render the image (like now), you have got the complete render process done on the GPU... (without speaking of passes)

But if we already had the opportunity to load the IR and LC already pre-calculated by cpu, and do the rest of the rendering on GPU, this would be a huge implementation!
Any ideas ?

Thanks

Stan

[vlado]

But if we already had the opportunity to load the IR and LC already pre-calculated by cpu, and do the rest of the rendering on GPU, this would be a huge implementation!

That's what we did for the light cache - just using it, not actually calculating it on the GPU. Like I said it was disappointingly slow. Perhaps more work is required to optimize it.

Best regards,
Vlado

[Alan Iglesias]

Interesting that it was so slow.

Well, if it's any consolation, I'm now totally addicted to using no (and having to find the perfect settings of) rendering biases at all whenever possible. Everything seems to look so much better with PPT - detail, GI, shadows, and even maps. I feel that one day (perhaps not too far in the future) you'll never have to worry about setting a bias ever again!

Just my .02$...

-Alan

[3LP]

Hey there!

Is there any tutorial about how to une the PPT?
I would love to try that out!

Thanks

Stan