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

26

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7
. 
Below image rendered with Fresnel IOR set 
to 2.5, it has more reflection and looks more 
like a metal texture now. The chair has some 
black reflection due to the default setting of 
the background color is
black
. 
Under
V
-
Ray
E n v i r o n m e n t ,
c h a n g e
t h e
c o l o r
u n d e r
Background
to
white
and
see
what
will
you
get.
6
. 
Notice the 
“
m
” 
on
the
right
side
of
the
Reflection
is
now
changed
to
“
M
”. 
That
means
the
Map
has
some
other
characters
associated
with it now
. 
Please
use
the
same
method
and
apply
Fresnel
to
other colors and render it. 
6
. 
Click on the Material Preview again. The Material now has reflection quality with the same color on it. 
5
. If it is not already enabled scroll down the box next to Type, and then select Fresnel. Fresnel IOR 
is to control the reflection intensity. Keep the default value of 1.55, then click Apply. 
V-Ray for SketchUp
27

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Wondering why V-Ray rendering engine doesn
'
t have the highlight option built into it? The truth is 
that the highlight is created by reflecting a very bright object or light in the scene
. 
It
also
called
lightsource
. 
Some rendering engines use Highlight to create lightsource if there isn
'
t any lightsource in the 
scene. But current V-Ray for SketchUp version does not support this option. SO you must create 
Rectangular Light or other self lit object as lightsource for the scene. 
Reflections and Highlights
Fresnel Reflections
Fresnel Reflections are a naturally occurring phenomenon that states that an object becomes more 
reflective the greater the angle at which it is seen. An example of this principle would be a window 
that is seen from straight ahead as opposed to at an angle. Through manipulating the Index of 
Refraction (IOR) the reflective characteristics of an object can be changed. A lower IOR means 
that a larger angle is needed between the observer and the surface before the object begins to 
reflect. A higher IOR means that a smaller angle is needed, which in turn causes the object to 
reflect sooner. To have your renderings be more physically correct it is recommended to have the 
IOR of an object correspond to its actual IOR.
Below are six rendered samples each with a different Fresnel IOR. The last one is a rendered with 
full reflection to creae a chrome material.