They are not dented at all...
If you look at the crest of the roof, you can see the "damage", but it's a mere illusion..
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Now look that the crest of the roof on this other picture of yours... It's a solid line across, without any indentations present..
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It can also be seen here..
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It is a perfectly flat (slight bulge upwards but all cars have this present) line across.... You are referring to the illusion, which cannot be seen truly, because the crest is constantly flat..
If you couldn't tell from my 16 hour long absence.... Then yes.
A polygon does not have to be out of place to represent a deformation of the body panel. Anyone with a paint application or that can use a java scripted application where you can "drag" the image will present the same effect as such...
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There is obviously no such actual deformation of my body, but an illusion appearing as if there were. All the game is simply doing is taking in the reflected light, and distorting it on a pre-determined polygon map where the body panel appears to be crumpled. Then,you have light shading effects which is why sometimes the car turns into a grey like effect, where it "fills in" the pre-determined mapping...
It's a mind trick, and people still fall for it..