2010

Table Of Contents
To render the scene using caustics
1 In the Render View window, click the Redo Previous Render icon.
2 When the image has completed rendering, click the Keep Image icon.
3 Compare this rendered image with the previously rendered image by
dragging the scroll bar at the bottom of the Render View window left and
right.
This image differs from the previous one in the following ways:
The bottle appears more opaque. This indicates that the correct
number of refractions may not be occurring. The Raytracing Refraction
Level setting may need to be increased. When a different preset was
selected (Production to Preview), the refraction levels changed.
There are spotted areas on the table surface directly in front of the
bottle. This can be corrected by adjusting the photon quality settings.
The desired caustic effect in the shadow has appeared but is not very
pronounced. You want to achieve an effect where the shadow has
brighter regions as a result of light being refracted through the surfaces
of the bottle.
Adjusting the refraction levels
When the refraction levels are set too low, light rays do not refract through
all of the surfaces enough to provide a realistic indication of a translucent
surface when raytraced. This results in the object appearing opaque when it
should appear translucent.
528 | Chapter 9 Rendering