Why when I try to make a render of a car it looks like it's floating?

The floor is an arbitrary distant below of the render

2 Answers

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.

Answered with a tutorial: https://grabcad.com/tutorials/why-when-i-try-to-make-a-render-of-a-car-it-looks-like-it-s-floating

It can be also achieved (fixed) by right clicking and selecting on "edit scene" and selecting the proper selection of planes (XY XZ YZ) and adjusting the height