This one has the dreaded low intensity shadow setting. For clarity I've made it 30 rather than 50. This is unrealistic to the point of being ridiculous.

AgentSmith:
"PJF - Your second pic - that's just a horrible Bryce problem, and its always haunted me and pissed me off to NO end. But in almost all other scenes, you'll never really notice it. Yet, this absolutely needs fixed in B6.0, period."

No, this is how low intensity shadows in Bryce work. To get shadows of less than 100, Bryce lets light shine through opaque objects!