strange reflection on glass

[William Yan]

Hi guys,
I render the curtain glass with default physical sky , but the reflection on the glass have strange thing on it. In the scene, I only have this one building ,and the sky is empty. where come the dark reflection?
THankyou !

[William Yan]

here is the image with dark reflection

[alemanda]

You should change the general settings of cinerender. In particular you should low down the RAY THRESHOLD to 1% or even 0.
I wonder why this setting doesn't come 0 by default ... Nobody wants to see these strange reflections.

[William Yan]

alemanda wrote:
You should change the general settings of cinerender. In particular you should low down the RAY THRESHOLD to 1% or even 0.
I wonder why this setting doesn't come 0 by default ... Nobody wants to see these strange reflections.

man! You save my life!! Thank you so so much!!!