LuxCoreRender Forums

Hi,
why do the reflections in Cycles and Luxcorerender look so different?
The whole glass is reflected in Cycles!

Thank you

denon100 wrote: Sat Dec 14, 2019 12:38 pm why do the reflections in Cycles and Luxcorerender look so different?
The whole glass is reflected in Cycles!

You are using a spot light and, in LuxCore, spot lights are not intersectable light sources (see how there are no caustics ?). It looks like spot light in Cycles are intersectable: notice the vague caustics and the little highlights on the mirror. Does Cycles have a radius setting for spot lights ?

Anyway, just enable light tracing and you will start to have a more realistic rendering:


You have also set the glass reflection to (1, 1, 1) so a lot of light is reflected, reduce that value if you want more light transmitted and less reflected:

The problem is that you're facing some smoothing problem.

Try to set autosmooth on the reflector object or assign it an edge split modifier.
It should reflect like Cycles

Sorry, I thought that a piece of the reflection is missing!
In Cycles I see the whole glass as a reflection!

Thank you

denon100 wrote: Sat Dec 14, 2019 1:46 pm Sorry, I thought that a piece of the reflection is missing!
In Cycles I see the whole glass as a reflection!

It is what Marcatore is talking about, if you set the object to flat shade, the reflection will start to be visible, you are interpolating normals over more than a 90 degree angles.

The mesh has custom split normals, which aren't supported by BlendLuxCore currently.
You have to delete them to get the same result with Cycles and Lux:

Thank you very much, it can be so easy