RENDERING SETUP

Open the rendering menu, and open print size assistant

change the DPI value to 300 and make sure its in landscape mode

press f10 or click rendering tab and open render setup

choose the renderer, in this situation I choose NVIDIA mental ray. and change the Global Illumination Presets to medium

in render elements tab click the add button and find shadow and click it.

render set up is done, the next thing is click render button.