Maybe it's only on my side | W10, B281a, latest LuxCore 2.3beta (9addec117) | So, as mentioned in ENV cache persistance thread,
... There are differences between CPU vs OCL
Using OCL:
A. Glass produces brighter caustics (refractive) /// Notice darker shadow with CPU
B. Metal is missing reflections
& here's .blend ready to be checked. Issue also occurs in the viewport, just switch engines.
HDRI "Barcelona Rooftops" from sIBL archives included
I fixed a problem, recently introduced, with normals of instanced/motion blurred object. Now the metal/mirror/glass object look the same between CPU and OpenCL.
Support LuxCoreRender project with salts and bounties
Dade wrote: ↑Mon Jan 13, 2020 10:18 am
I fixed a problem, recently introduced, with normals of instanced/motion blurred object. Now the metal/mirror/glass object look the same between CPU and OpenCL.
Confirming the fix. Working correctly now.
Quick comparison gif:
Note:
The difference in rendered image between OCL vs CPU is really minimal now, basically just a difference caused by sampling (tested with Sobol @ 500 samples).
So, as mentioned in ENV cache persistance thread, 
