Viewport
Viewport specifies the rectangular region where a View's Scene is rendered.
The viewport defines where the content of the View (the Scene) is rendered in the render target. The render target is automatically clipped to the Viewport. All coordinates are in window/screen space with the origin typically at the bottom-left.
Parameters
left
Left coordinate of the viewport (default: 0)
bottom
Bottom coordinate of the viewport (default: 0)
width
Width of the viewport in pixels (default: 0)
height
Height of the viewport in pixels (default: 0)