SHADOWS CATCHER

[icelaglace]

It's very simple....
Just set the diffuse to black, it's a shadow catcher; not a material you're going to look at.

[Interfaces]

I thought it was the shadows directly;

So you need a black color and opacity
Ok, thank you for your help!!

[TIG]

So why did you not ask these questions on those forums directly initially ?
This is not a Sketchup specific issue...
Currently v1.01 is broken for my older GPU - so I can't test it anyway !

[Interfaces]

I thought it was the shadows directly;
I thought it came from sketchup plugin.
Sorry.