Why when I try to make a render of a car it looks like it's floating?
When you select a part, it turns blue (or green or orange) but that's not only what happens, if you check closer you'll see, that ther is a orange wireframe cube around it, and that's it, that's why your floor looks below the part.
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Step 1:
First you see this:
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Step 2:
The solution is simple: locate the wheel missaligned (maybe all of them are missaligned) and do what you shouldn't do in regular conditions, add unnecesary mates
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Step 3:
Now you're wheels are aligned
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Step 4:
The box is aligned:
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Step 5:
And your floor is fine:
