HDRi and Light Tracing

[jgrover110]

When using a HDRi with light tracing, it looks like the shadows are a lot darker, as if only the sun is used in the image. This seems to only happen when using OpenCL, CPU looks as it should.

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OpenCL + Light Tracing + Caustic Cache

There are also a lot of fireflies in this scene, not sure why as caustic paths should be accounted for with the cache.

OpenCL + Caustic Cache

[Dade]

What LuxCore version are you using ?

[jgrover110]

Latest build V2.4

[Dade]

Your scene seems to have only a 2% of light rays (this is like enabling light tracing and than not doing it)

@B.Y.O.B: wasn't the light tracing % hidden and set to 100% automatically with OpenCL

[Dade]

Your scene seems to have only a 2% of light rays (this is like enabling light tracing and than not doing it)

Note: the same happen if you render in OpenCL with light tracing enabled (that is done only on the CPU) and 0 CPU threads.

[B.Y.O.B.]

I made it possible to use less than 100% light rays even with OpenCL after JuanGea pointed out that very powerful CPUs are a waste to use for only caustics.

Maybe I should set a lower limit for light rays though, something like 20%.

[Dade]

I made it possible to use less than 100% light rays even with OpenCL after JuanGea pointed out that very powerful CPUs are a waste to use for only caustics.

Oh, ok.

Maybe I should set a lower limit for light rays though, something like 20%.

Using 0% (or 100%) can be still useful for some trick (like getting only light tracing or only eye tracing output for compositing) so I guess we can leave it as it is.

[B.Y.O.B.]

Ok.

[jgrover110]

Light Rays was set to 100% using OpenCL, the 2% was only on CPU rendering (which had the correct result).

[jgrover110]

Just to clarify what the issue is here, the CPU image looks as it should, but the OpenCL image has the shadows much darker. The Light Tracing % was set to 100% for OpenCL, and set to 2% for CPU. I only set it to 2% as I didn't need the default 20% as the caustics would get clear much faster than the rest of the scene

OpenCL + Light Tracing (100%) + Caustic Cache

CPU + Light Tracing (2%) + Caustic Cache