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I'm completely new to Blender. I've taken a cube someone else modeled and trying to create Ambient Occlusion for it. I've noticed that in edit mode, some of the faces are lighter than others. What does it mean and if it requires fixing, how? File is

enter image description here

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    $\begingroup$ At first glance I would say, they haven't got the orange tinted overlay that indicates selection. So they are simply unselected. The circle ones have selected edges to the center, but when you're in Edge Select mode instead of Face Select, then the faces won't be shown as selected when one or more border edges are unselected. The only thing I can't tell from the screenshot is why the faces adjacent to unselected ones seem to be selected (because they share unselected edges) and in my Blender unselected edges are black, not white - but this might be a customized color setting of you. $\endgroup$ Commented Jun 24, 2021 at 10:45
  • $\begingroup$ maybe you should upload your blend file so we don't have to guess what happened.... $\endgroup$
    – Chris
    Commented Jun 24, 2021 at 10:59
  • $\begingroup$ @Chris, I thought it'll be a trivial answer. But where do you recommend I upload to? $\endgroup$
    – IttayD
    Commented Jun 24, 2021 at 11:20
  • $\begingroup$ @GordonBrinkmann I selected with 'a' in face select mode. I just tried it with edge select mode and the areas went away. Still not following why this faces are not selected in face mode... $\endgroup$
    – IttayD
    Commented Jun 24, 2021 at 11:20
  • $\begingroup$ just open blend-exchange.com and follow instructions $\endgroup$
    – Chris
    Commented Jun 24, 2021 at 11:53

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Ok, you have several objects (each cube is an object in your case).

In "Edit mode" (you can toggle between Edit mode and Object mode with TAB) you can select vertices, edges and faces.

enter image description here

In your case the face selection is active.

Blender differentiates between 3 states:

unselected (gray in your case), active (can only be one single face per object - white), and selected (can be multiple faces - orange).

enter image description here

if you press A in object mode, all objects will be selected.

This looks like this:

enter image description here

Same rule here: only one object can be active (orange), but many can be selected (red/darker orange).

If you then go in edit mode, you see this:

enter image description here

and because every cube is an object, each of these objects/cubes have one active face, which is white. And all other faces are selected, thats why they are orange.

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