Updated docs on parallel scale
@@ -173,7 +173,16 @@ Near clipping and Far clipping
are so you will have to experiment.
Parallel scale
- Zoom factor: larger values zoom the camera towards the focus.
+ Acts like a zoom factor that zooms the camera towards the focus. For a
+ parallel projection, it is half
+ the height of an object in the window. For example, if you had a sphere of
+ radius 10, setting the parallel scale to 10, would result in the top and
+ bottom of the sphere touching the top and bottom of the image. Where the
+ sphere touches on the left and right edges depends on the aspect ratio of
+ the image. If it was 1:1, then the sphere would also touch the left and
+ right edges of the image. When doing a perspective projection, it attempts
+ to have the top and bottom of the sphere touch the top and bottom of the
+ image.
Perspective
Applies to 3D visualizations and it causes a more realistic view to be used
