U g I n f o r d e s I g n e r s

V-Ray for SketchUp
72

---

Size of Aperture
There is Aperture located at the top of
the
control
panel
for
Depth
of
Field
under
Camera
. 
V
-
Ray
doesn
'
t use 
the same number unit of F1.4 F2.0 F11 as normal camera does to control the amount of light comes into the 
camera but use the system unit for its size. Smaller number has less effect on Depth of Field. Larger number 
will make the object very blurry and takes longer time to render. Especially when calculating the edge of 
object for Depth of Field effect. So we recommend you start with smaller number and move your way up if 
you need stronger effect. This scene’s aperture was set to 24. I recommend you try different values and see 
what results you get. 
Image on the top is rendered without Depth of Field and image on the bottom is rendered with Depth of Field.
V-Ray for SketchUp
73

---

The glass cups are products of Nachtmann 
from Germany.
Below are some images showing more example of Depth of Field. 
V-Ray for SketchUp
74

---

Physical Camera
The Physical Camera feature allows the camera’s reaction to light to mimic that of a camera in 
the real world. This means a much more natural reaction to light as well as an added dimension 
of control over the lighting of your scene. There are also added ways to adjust your rendered 
result.
In V-Ray’s physical camera parameters you will 
see that there are three options within the 
types of cameras. The first is a still camera, 
and the other two, cinematic and video, are 
for use with animations. We will only be 
concerned with the still camera, as the others 
are used to do camera matching with existing 
footage. The still camera may still be used 
with animations, and produces great results.
Type of Camera
Adjusting Exposure
Now that we know what determines the exposure how do go about properly adjusting it for our 
image. This can be done through either of the three parameters: ISO, Aperture, or Shutter 
Speed. In order for these parameters to have an affect on the exposure of the image Exposure 
must be checked in the physical camera settings. Depending on some of the other affects that 
are being used adjusting the camera via one parameter might be more appropriate than another. 
Exposure
In the real world, exposure is the act of light affecting film or a sensor, and there are three 
aspects that dictate the resulting affect of the light. The first is known as ISO speed. The ISO 
speed refers to the sensitivity of the film or sensor. A larger ISO speed corresponds to a greater 
sensitivity to light. The second aspect affecting the exposure is the aperture. This corresponds 
to the size of the opening that allows light to pass to the film or sensor. This value is referred to 
as F-stop, and smaller values equate to a larger opening, and thus more light. The last 
component that will contribute to the exposure is the Shutter Speed. The shutter speed is the 
amount of time that the light is allowed to affect the sensor. A longer amount of time will allow 
in more light, leading to a brighter image.