V-Ray for Rhino Manual - Rum

Using Aperture
When using aperture to adjust exposure remember that there is an inverse relationship between
the value and the result. Meaning that a small value will increase the brightness of your scene,
and that a large value will decrease the brightness of your scene. If you have depth of field
enabled, then the aperture value will determine how much depth of field will be in your scene. A
smaller value will create a narrow depth of field, in which objects will have to be closer to the
focal distance of the camera in order to stay in focus. A larger value will create a greater depth
of field. This will allow objects to stay in focus even if they are farther away from the focal
distance. If you are trying to get achieve a particular depth of field, then it is recommended that
you adjust the exposure through the shutter speed or the ISO setting.
F-Stop= 6 F-Stop= 8 F-Stop= 12
Using Shutter Speed
Shutter speed can be another good way to adjust the exposure of your image. The parameter
itself actually expresses itself as 1/x. In other words inputting a value of 4 actually means a
shutter speed of one quarter of a second. Therefore a larger value actually means that the
shutter speed is faster, and that will translate to a darker image. If you are doing any animation,
with either moving objects, a moving camera, or both and also have motion blur enabled then the
shutter speed will have a direct effect on the amount of motion blur. A longer shutter speed will
cause a greater amount of motion blur, where as shorter shutter speed will decrease the amount
of motion blur. The amount of blurring will also be determined by the speed of the objects as
well. If you are trying to have a certain amount of motion blur, then it would be advised to test
different shutter speeds until the right amount of blurring occurs, and then adjust for exposure
with either aperture or ISO value.
Shutter Speed= 60 Shutter Speed= 100 Shutter Speed= 180
80
V-Ray for Rhino