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I have a rooms with multiple walls. I only wanted to bake the interior of the room - the floor, ceiling and another 4 walls and ignore the windows and outer walls.

I selected all the objects that I would like to bake and go to UV Editing, create a new texture for baking and Select All then choose UV->Lightmap Pack.

I roughly go through all the triangles that sit on the texture and found no overlapping so I go back to Shading Tab, select only the floor object and select the image that I want to bake, hit bake button and the result is correct, but If I choose the 6 objects (4 walls, floor and ceiling) and bake again, it return me a result as shown in the image. I try to choose the wall and bake it, it return a correct results but it just don't work if I try to bake all of them together.

Some one please help me, Thanks in Advance.

enter image description here

enter image description here

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When you unwrap with type Lightmap Pack you have to set enough Margin or lower Bake Margin value, because like now Bake Margin overlaps.

enter image description here

Unwrap Margin value is described in UV division, that I'm not sure what does that mean exactly, Bake Margin is in pixels. So just check if baked borders are between faces.

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