Lighting an Interior Daytime Scene - Photographic Rendering with V-Ray for SketchUp - page 66

1. Select the Orthographic - Front scene tab.
2. Right-click on the V-Ray spotlight.
3. From the V-Ray for SketchUp flyout, select the Edit Light option.
4. In the V-Ray light editor, put a check in the Enabled option and click on OK
to exit.
5. Switch back to the POV - Main Gallery view by clicking on the scene tab.
6. Finally, hit the render button and again save to the hard disk using the
Render history window.
The evaluation time
With the renders completed and saved, one thing that we really should follow as a
standard practice would be to always perform a comparative evaluation by examin-
ing and measuring what we are seeing in the images against the artistic definition
that we created at the outset of our chapter. Ultimately, the questions we need to an-
swer are: am I (or are we) heading in the right direction with the lighting by using this
particular approach? Can it produce the end result that we are after?
To show how we can use the render history feature on the V-Ray frame buffer to
make such an evaluation, let's perform the following steps:
1. In the Render history window, click to select our initial render that should be
right at the bottom of the stack by now.
2. Then, on the toolbar of the same window, click on the A button to set this
render as the A channel in the V-Ray frame buffer window.
Instantly, we get a split screen in the V-Ray frame buffer window with our newly se-
lected A channel render showing up on the left while the currently rendered frame is
shown on the right.