all my beams and columns are visible in revit 3d model instead of a cleaner view in 3d

[kartik_ngagerUX4M3]

[sahin.ikbal]

I think your visual style is set to "wire frame".

Change it from here to something like "realistic".

[kartik_ngagerUX4M3]

It is realistic only, still showing 

[sahin.ikbal]

Please you share your sample file for me to recreate the situation.

[kartik_ngagerUX4M3]

here it is

[sahin.ikbal · Accepted solution]

It was showing the edges because of *Show Edge option turned on.

Change it following below steps your problem will be solved:

[kartik_ngagerUX4M3]

just one last thing, why is the realistic model not clean, like why it is wavy? as it is in the picture you have attached

[sahin.ikbal]

Because of Revit's internal curve approximation Graphics.

[kartik_ngagerUX4M3]

Is there any way to correct that?