sounds like the camera isn't looking at the model. In the perspective window.
set your floor plan so what you want to see shows in the plan window.
View>3D view mode>3D projection settings>Perspecitve Settings.On the left you will see your floor plan window. you can click on the sun symbol and move it around or set precisely day time and location in More Sun.
The other setting graphic you can click on the circle which is the target and holding down the mouse button move it to where you want. Similarly the corner of the L shaped heavy line click on that to move where the camera is located.
Save views of the 3D window redefining to match current 3D window when you have a view you like so you can return there.
A hasty reply, but should cover the basics.
HTH.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"