What is "dia" an abbreviation of? I looked it up and this is all I found:

**Dia is a harmful status effect that burns the afflicted with light and illuminates their weaknesses until it wears off or is removed. Afflicted characters experience light Damage Over Time and reduced defense. As with other forms of DoT, damage dealt by the Dia effect will wake characters under the effect of sleep.
**
Poser won't do that. You need Final Fantasy. :O)

Seriously though, caustics is a subset of this with curved surfaces. Poser can't do it, so you have to find a way to simulate it.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)