Raytracing Part or All of the Active View
Raytrace rendering may be costly in calculation time. Therefore, the raytracing engine gives you the ability to render either a part or all of the active view.
To render the entire active view, use the function Raytrace active viewport 
. This function is available in the Visualization toolbar located in the upper part of Patchwork 3D user interface.
To render a part of the active view, use Select raytracing area 
in the Visualization toolbar and draw the rectangular region you want rendered in the active view. As long as this mode is active, raytracing rendering is limited to this defined region. The rest of the view is rendered with the OpenGL rendering engine.
Raytracing rendering limited to a region of the view.
For additional information, see: