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

V-Ray for SketchUp
70

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Radius for Shadow edge
When using Point lights, the shadow edge will be very sharp. To improve it, adjust
the
Radius
under
Shadow
dialog
box
. 
Using
Point 
Light
here
for
example
, i
mage
on
the
left
is
rendered
with
Radius
set
to
0. 
Image
on
the
right
is
rendered
with
Radius
increased
to
10.
The quality of Shadow
Unless the shadow is turned off, all objects will cast shadow under light.
The quality of shadow is controled by Subdivs under lighting dialog box. Rectangular light for example, under 
Sampling>Subdivs, please change the default 8 accordingly to get desire shadow quality. The higher number 
will cost more time to render. When set it to 32, you can get the almost perfect shadow without any noise. 
Image on the left is rendered with Subdivs set to 8
; 
image
on
the
right
is
set
to
32.
Light and Shadow
V-Ray for SketchUp
71

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How to find out the current setting of focus distance of the camera?
1
. Open file 
. You will see the image below which shows the distance between the 
chairs. Please note the distance between the camera and the chair in the center which is 67’ away. 
This is the number we need for the override focal distance, which is 800. (800 inches = 67 feet).
Chairs-DOF.skp
It’s important to note that exact location of camera was identified with ruby script “Note Camera 
Point” from www.smustard.com website.
What
'
s Depth of Field
?
Depth of field refers to the amount of an image which is in focus and the amount which becomes blurry. In 
photography it is impossible to have every part of an image in perfect focus. Because of this a photographer 
chooses what will be in focus and what will not. Within Vray this will correspond to the focal distance. The 
amount in which an object which out of focus depends on how far the are away from the focal distance of the 
camera as well as the size of the camera’s aperture. A small aperture will have a only a slight amount of 
blurriness for objects which are not within the focal distance. A large aperture will have a large amount of 
blurriness for objects outside the focal distance. 
Open V-Ray for SketchUp
’
s Render Options. Pull down Camera 
control menu and will see the big item of Depth of Field 
below. Default is set to off, check it if you want to have the 
depth of Field in the final rendering. Depending on the way 
your camera is set up you may want to check Override focal 
distance. With out this setting enabled V-Ray will use the 
focal distance of the camera.
Depth of Field