Some tests to understand Lux

[Magog]

Hi everyone.
In these free hours I spent a lot of time testing and trying to understand Lux.
I took an existing scene and started playing.

The part concerning materials and nodes is the one that interested me most.
In fact, the armchair in the first pano looks like velvet.
Too bad, it had to be leather!

There is the possibility of inserting an external plane as a Background, but making sure that the light passes equally?

[Dade]

There is the possibility of inserting an external plane as a Background, but making sure that the light passes equally?

Wouldn't be easier to set a transparent background and do an alpha composition with what ever image you want to show outside the window

[Sharlybg]

Too bad, it had to be leather!

you can use lower bump map (arround 0.3mm) for better results.

[Magog]

Wouldn't be easier to set a transparent background and do an alpha composition with what ever image you want to show outside the window

Excuse me but I didn't understand the procedure you explained to me.
In the 2 images I posted, you can see the difference in lighting between the first image that presents a plane outside, and the second, without any plane.
That's why I asked if there was a solution.

[Dade]

Excuse me but I didn't understand the procedure you explained to me.
In the 2 images I posted, you can see the difference in lighting between the first image that presents a plane outside, and the second, without any plane.
That's why I asked if there was a solution.

I mean, you can render the image without the plane outside the window and than use the alpha channel to compose any background image you want outside the window. I assume you are using an HDR infinite light source (are you ?).

[Magog]

Ah, ok! Right!
Usual procedure ..

The lighting is given only by Sky activated (by default), with the Gain at 0.0003

Tnx for your answer.

[Magog]

you can use lower bump map (arround 0.3mm) for better results.

This's the shader.
As said before, I must begin to understand Lux ​​with the nodes of the materials

[Sharlybg]

In blender switch to metric mod and tip (0.3mm ) in your bump node.
you can just copy past "0.3mm" in metric mode

[Magog]

Perfect!!
Tnx a lot!

[Magog]

Is there a tutorial or discussion on the forum where we talk about the Photon Count report, Photon Depth and the other PHOTON GI settings?
How can I understand how many photons need the scene and the relationship between them?
Thank you