Quality Control - Photographic Rendering with V-Ray for SketchUp - page 293

Fine-tuning scene lighting
As a starting point, let's go back to pretty much where we started on this project and
once more take a look at the lighting that we have set up in the scene. In order to
make an honest evaluation of just what each direct light source in the scene is con-
tributing to the illumination, we really need to render them one at a time with all scene
materials enabled.
To set this up in V-Ray, let's perform the following steps:
1. Open up the DT_Interior_QualityControl_Start.skp scene.
2. Then, go into the V-Ray option editor's Indirect illumination rollout and turn
off GI in the scene.
Now, any renders we take will only show us the contribution of direct light sources
in the scene. Also, as we are going to be taking these images into either a viewer
or editing application for close examination, we will really need to view them in their
gamma corrected form.
To do that, perform the following step:
1. In the Color mapping rollout of the option editor, uncheck the Don't affect
colors option for now.
Note
We will need to keep in mind that this option has to be re-enabled before
our final renders are taken.
Tuning up the sunlight
Of course, for a careful evaluation we need to narrow things down a little further. So,
first of all, let's focus on the sun or spotlight in the scene. To be able to take a sunlight-
only render we need to perform the following steps: