Bonjour.
Je suis étonné de votre problème.
J'ai fait l'essai avec deux murs très proches l'un de l'autre et ça n'a pas posé de problème.
Vous pouvez aussi appliquer la texture du bardage sur la face extérieure de votre mur principal.

Bonjour. Il n'importe si je fait quelque chose avec le texture. Et le distance entre le mur nouveau et l'édifice existant n'importe vraiment aussi.

Je vais posterai plusieurs photos pour mieux demonstrer le problème.

I'm not sure what you mean by "bleed into the new wall" but a wall in front of another wall should display as intended: covering the back wall.

You're right, placing a wall in front of another wall SHOULD display as intended. Unfortunately it is not. Hopefully these photos I just took will illustrate what I mean by what is happening when I create a new wall, with the new wall intended to portray exterior siding.

I assume you want the siding like a baseboard: only part of the wall covered.

No, I want the siding to look like siding - covering the entire exterior with holes cut out for windows and doors and whatever other openings are supposed to be extruding from the house. It's not some kind of baseboard.

PHOTOS OF PROBLEM

Sorry about the flash - I turned flash off, twice, so I don't know why the camera is flashing anyway. You can still see what you need to see in the images.

1: Creating a new wall. See the new wall highlighted in the 2D section of this image:


2: Setting variables for the new wall. The new wall is 950cm high, 15cm thick, and is red:



3: See what happens in the 3D section after I click OK:



In this image, you can see the siding is successfully not covering up the windows, which I want, but it is unfortunately also not covering up sections of walls and chimneys, etc, that I drew earlier. Those walls and chimneys do not extend past the perimeter of the house so they should not be bleeding into the new wall which is meant to be exterior siding which covers up the entire house.

4: See what happens when I move the new wall almost 2m away from the existing structure, so it is not touching anything at all: