If the exterior in your rendered visualization shows noise, washed-out whites, or similar issues, read this article. It will help you get a clean exterior displayed at normal brightness, without producing any unnecessary lighting effects.

Figure 1: Create a backdrop plane and place it as close to the window as possible. The purpose is to prevent the black background around the backdrop plane from "leaking" in from the sides and producing black reflections.

Figure 2: Turn off both the "Cast Shadows" and "Receive Shadows" properties of the backdrop plane. The purpose is to let other light sources pass through the backdrop plane without obstruction.

Figure 3: Assign a standard renderer material to the backdrop plane. A self-illuminated material is not used here, so that no lighting effect is created in the scene and no unnecessary noise is produced.

Figure 4: Load the desired background photo into the Self-Illumination channel, and check the "Compensate camera exposure" option. The purpose is to keep the exterior photo displayed at normal brightness under different camera exposures.

Figure 5: Change the diffuse color to pure black. The purpose is to prevent the backdrop plane from being affected by other light sources and "washing out" to white.

Figure 6: Render test — we get a clean exterior displayed at normal brightness, which produces no unnecessary lighting effects.

That is all for today. Hope this helps.