www.kraytracing.com

I see that thanks

here's an old test I did with syntheyes....
the track is a little off because of rolling shutter, but the main exercise was getting scene reflections onto the CG object

the video explains the process somewhat
https://vimeo.com/95061758

it appears the vimeo link tags on this forum dont work ...

if you can.... find the spec of the projector and playback device.

if they are using 4 projectors together, its a good bet it is 4k at least...
20 m is just under the standard IMAX size (about 22m) 70mm IMAX film is about 4k+ in terms of resolution

Barco only has 2, 12000 lumen projectors listed ...

WOW !!

Very nice work

there have been a handful of GPU photon mappers already written...here is one example
https://vimeo.com/81835028
https://github.com/ishaan13/PhotonMapper

Nowhere near as complex as Kray code for sure....but basic photon mapping accelerated by the GPU with the K/D tree calculated by the CPU

some ...

Idea of Bounce light should be the same in Path Tracing and Photon Map - otherwise is not according to physics.

not arguing the laws of physics....just that the bounces for 1 are interpolated and using 1 path...and PT using multiple paths (1 per sample). Nothing to do with physics.
The most ...

Rendering interior must be done with minimum 7-10 bounce light and each bounce light for Path Tracing is killer for time render. Trying render interior with recurse under 5 affect realism.

The bounce for PT and the bounce for photon mapping are 2 totally different things.

The bounce for photon ...

I tweaked your render settings for you....
totally noiseless image with only 75% of the samples you used and using the faster kernel...should render in half the time

Coherent ratio...GI clamp and caustic blur are the keys here

....2 bounce only
I think 5-10 bounces is minium for rendering, under this, GI is artificial.
btw very good score but as I told above: when you will add full scale interior: more bounce lights, reflection/blur, lights, Sun Light then the noise will be forever :wink:

Anyway you have two good GPU ...

Just one more for a comparison
Octane
14min 10 sec

3500 samples
5 bounce path tracing, 25% coherent ratio
Octane Daylight

Still some noise....probably would need 4500 samples to be totally clean. This is where Photon mapping would be great, as the path tracing results is exponential in nature ...

judging by the octane bench...your combined score is around 209, whereas mine is about 166...about 79% the power of yours
so if the bench is accurate you should be able to do 3000 samples with your setup in about 2:55

3000 samples....2 bounce only (trying to match kray image shadows)

key is coherent ratio to 30% (only good for stills...10% possible with animations using thousands of samples)
hot pixel viz 60%
filter 1.3

Janusz Biela wrote:K3 render with only Physky2 without Sun (HQ GI but not ultra, 24 min/i7 CPU) :

K3_.jpg

Very nice quality

just so I can try to match....is this linear, or is there any gamma?

Octane Path tracing (1080p only)
1x GTX970
2X GTX470

3 minutes 40 seconds