LuxCoreRender Forums

Posted: **Mon Mar 11, 2019 11:49 am**

lacilaci wrote: Mon Mar 11, 2019 6:30 am I created small isolated case here:
00_concept_lux.zip

the small selected object with material+emission will completely ruin photongi unless you hide it or unplug emission

Going to check what is going on.

Posted: **Mon Mar 11, 2019 12:59 pm**

Dade wrote: Fri Mar 08, 2019 1:24 pm
So it will not be totally off but also not so accurate in this case.

lacilaci wrote: Fri Mar 08, 2019 1:16 pm 2. What are those ray differentials ?
It is this stuff https://graphics.stanford.edu/papers/trd/

Dade, did you notice follow?

Code: Select all

intern/cycles/kernel/svm/svm_displace.h
ccl_device void svm_node_set_bump(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
#ifdef __RAY_DIFFERENTIALS__ ...

Posted: **Mon Mar 11, 2019 1:01 pm**

Dade wrote: Mon Mar 11, 2019 11:49 am Going to check what is going on.

I suspect the large span between light intensities (precision issue? ie. Sun&Sky VS Candle light) combined with "Automatic Lookup Radius" (too small or not enough photons?), since after values get balanced & Radius is set manually, debug result looks like:

Posted: **Mon Mar 11, 2019 1:07 pm**

could you post the final image with that kind of lighting setup?

Posted: **Mon Mar 11, 2019 1:18 pm**

marcatore wrote: Mon Mar 11, 2019 1:07 pm could you post the final image with that kind of lighting setup?

Here, done in 120seconds (502 samples):

PS
above had HDRI instead of "Clear White Sky"

Here's another in 120sec (499 samples):

PPS
Notice bad settings worsen performance

Posted: **Mon Mar 11, 2019 1:31 pm**

FarbigeWelt wrote: Mon Mar 11, 2019 12:59 pm Dade, did you notice follow?
Code: Select all
intern/cycles/kernel/svm/svm_displace.h
ccl_device void svm_node_set_bump(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
#ifdef __RAY_DIFFERENTIALS__ ...

What do you mean ?

Posted: **Mon Mar 11, 2019 1:34 pm**

kintuX wrote: Mon Mar 11, 2019 1:01 pm I suspect the large span between light intensities (precision issue? ie. Sun&Sky VS Candle light) combined with "Automatic Lookup Radius" (too small or not enough photons?), since after values get balanced & Radius is set manually, debug result looks like:
pff.jpg

Can you get your scene to crash with manual too small radius?
I was able to use 0.001, but not well below this, and 0.01 radius is way better covered. In my case the auto radius is most likely tuning in too small radius when rendering high res like 6000 x 4500 pix, auto is crashing every time like manual radius 0.0001. Radius 0.01 already gives me map size of 8% with maximum number of photons.

Posted: **Mon Mar 11, 2019 2:03 pm**

It looks like instead of addition, new cache entries from different lightsources are replacing old ones.

Posted: **Mon Mar 11, 2019 3:05 pm**

lacilaci wrote: Mon Mar 11, 2019 6:30 am I created small isolated case here:
00_concept_lux.zip

the small selected object with material+emission will completely ruin photongi unless you hide it or unplug emission

I'm trying the scene but I get the right output out of the box:

Should I change something ?

Posted: **Mon Mar 11, 2019 3:08 pm**

Dade wrote: Mon Mar 11, 2019 3:05 pm
lacilaci wrote: Mon Mar 11, 2019 6:30 am I created small isolated case here:
00_concept_lux.zip

the small selected object with material+emission will completely ruin photongi unless you hide it or unplug emission
I'm trying the scene but I get the right output out of the box:

img1.jpg

Should I change something ?

I'll try redownload latest daily so I'm sure.

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