Thanks guys, you're right it's better without black lines
But sometimes i want them (-:
I found a solution, i open the skp file with sketchup and I select "export edges" in the collada file options

Hi all,

Previously when I imported collada furniture (from the 3dwarehouse sketchup) the rendering was good (with visible lines)

https://i.ibb.co/WcwGdq8/Meuble-OK.jpg

Now when I import a furniture I no longer see lines (the rendering is therefore less good...):

https://i.ibb.co/3MNF7n1 ...