Lighting an Interior Nighttime Scene Using IES Lights - Photographic Rendering with V-Ray for SketchUp - page 97

3. In the Open Bitmap File window that pops up, browse for and select
the HDRI file that you will be using. (In my case, the Et-
nies_Park_Center_Env.hdr file.)
4. In the UVW section at the bottom of the editor controls, set UVW Type to
UVWGenEnvironment .
5. Click on OK to exit Editor .
Let's take a render at this point to see how things are shaping up by clicking on the
Render button up on V-Ray's main toolbar.
As you can see in the finished image, while producing a reasonably decent overall
effect, the current GI (skylight) intensity value of 1.0 is perhaps just a little too bright
for what we are trying to create here. We also have more color saturation showing
up in the scene than is perhaps necessary or desirable.
To fix the problems that I am seeing, let's first of all reduce the intensity of the HDRI
by effectively dialing down its brightness:
1. We can do this by setting the GI (skylight) intensity spinner value to 0.05 .
2. And we can then adjust the saturation of the image a little by clicking on the
GI (skylight) map button and with the Color Space value in the controls at
the top set to Gamma Corrected , set the Gamma value just to the right to a
value of 2.0 , and click on OK to exit the editor.
As always, whenever making subtle changes we really need to see how effective
they are by taking yet another test render. Take a look at the following screenshot: