Motion blur doesn't work on emitted particles: Alpha5
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first steps on luxcore
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Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Re: first steps on luxcore
How it is possible to see the light from the purple cube behind a dark geometry .
blend
blend
Re: first steps on luxcore
It's not implemented yet.
Re: first steps on luxcore
but should we be able to see the purple cube in my scene ?
Re: first steps on luxcore
No, it should not be visible. Maybe a bug in the depth of field code (could it be that it generates some rays that start below the ground plane?).
Re: first steps on luxcore
It seem that our light sampling isn't good enough. especially for mesh light and HDRi.It is like we produce to much noise no matter the settings. I also see that light with more than 10 triangles are better in cycles than in luxcore .here are my results:
they all run for 60 seconds on GPU without clamping:
Cycles
Luxcore sobol
Luxcore metropolis
Luxcore Bidir
they all run for 60 seconds on GPU without clamping:
Cycles
Luxcore sobol
Luxcore metropolis
Luxcore Bidir
Re: first steps on luxcore
Are you using a single mesh with more than 24 triangles ?
LuxCore switch direct light sampling off for meshes with more 24 triangles. There is an option to re-enable direct light sampling but I assume it is not exposed in BlendLuxCore.
To check the difference, render an image with exactly 24 triangles and than with 25, you will see an huge difference.
This option is intended for light sources with many hundred/thousand of triangles that affect a very small area of the rendering (for instance a neon signboard, etc.).
In your case, it is the only light source and affect all image so it is very detrimental.
P.S. BiDir ignores this setting because it isn't applicable to bidirectional path tracing.
Re: first steps on luxcore
Is there any possibility to enable this automatically inside luxcore so the engine can detect itself when to enable and when to disable ?Are you using a single mesh with more than 24 triangles ?
LuxCore switch direct light sampling off for meshes with more 24 triangles. There is an option to re-enable direct light sampling but I assume it is not exposed in BlendLuxCore.
To check the difference, render an image with exactly 24 triangles and than with 25, you will see an huge difference.
Re: first steps on luxcore
It is exactly how it is working now, using a 24 triangles threshold. The threshold can be raised/lower but you can always build a case where you picked the "wrong" threshold.Sharlybg wrote: ↑Fri Mar 09, 2018 10:22 amIs there any possibility to enable this automatically inside luxcore so the engine can detect itself when to enable and when to disable ?Are you using a single mesh with more than 24 triangles ?
LuxCore switch direct light sampling off for meshes with more 24 triangles. There is an option to re-enable direct light sampling but I assume it is not exposed in BlendLuxCore.
To check the difference, render an image with exactly 24 triangles and than with 25, you will see an huge difference.
Indeed, it is not possible to know how large will be the effect of the light on the rendering without doing the rendering itself.
At the moment there are 3 possible settings:
1) always disabled
2) always enabled
3) disabled if over a threshold, enabled otherwise (the current default)
I can change the default and/or the threshold but you can always build a case where they will not work well.
The real solution is the additional pre-processing phase I was talking about when discussing HDR visibility map (a light cache-like solution).
Re: first steps on luxcore
Aaah Ok understood . will try to avoid some bad cases.I can change the default and/or the threshold but you can always build a case where they will not work well.
The real solution is the additional pre-processing phase I was talking about when discussing HDR visibility map (a light cache-like solution).
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Now i've got time to show some of my observation about HDR sampling efficiency and render preview quality/speed. It is like Cycles Hdri management is faster when Multiple importance is enable.
READ NOTE ON IMAGE FOR BETTER UNDERSTANDING:
Luxcore
Cycles