Render artifact in the contact area between objects

#1

Hello,
I’m trying to make xStream work fine in 3dsmax but I must admit that it’s not so simple, and compatibility issues occur.
In this case, I have a wall on the ground, the overall render is fine, but there is a bright zone at the contact area between the wall and the ground. Ground material is a vue shader and wall’s one is a standart max shader. Rendering engine is mr. (see pic)
Does anyone know how to fix that?
Thank you

#2

I found that the problem is even stranger that I thought.
In fact, this white artifact is the hidden part of the wall under the ground being displayed in strange, “additive” way, like if the ground was transparent or something. I saw this when I tried to lower the wall’s position and see if it was the white shader that was causing that. (see pic)

#3

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