Hi Emmanuel,

Couldn't reply sooner been unwell for a few days.

Thank you for the information and lightSource.obj.

I had discovered the deformable#, texturable# and lightSourceDiameter# properties and had already added them to the AdvancedRenderingLights that I used in the above 3.2 renders, to help make sure the lights closely matched the previous renders.

One question, if the light object doesn't start with sweethome3d_light_source, won't it then show in the SunFlow render? [:(]

As for render times, yes you guessed correctly!

The first "Gallery space" renders (very high resolution) I tried were with a custom AdvancedRendering version, it used twice as many samples (I was aiming for very high quality) and took a massive 51 hours. [:(]

Then, after returning the samples back to the previous settings, the render was around 23 hours.

After discovering a bug with SunFlow, that drastically affected indoor render times if sunsky or IBL isn't required, I made a new custom AdvnacedRendering version just for this model with that disabled, which rendered the same scene in 13.5 hours. [:)]

I was very pleasantly surprised to find Sweet Home 3.2 rendered the scene in around 5-6 hours, well done! [:)]

Have downloaded the source code, look forward to examining the changes you made.

Thank you,

David