[yt-users] volume rendering brightness

[Geoffrey So]

Hi volume rendering experts,

I was playing around with a density volume render of a tiny cube on my
laptop, everything went smoothly, however, I notice a change in "overall"
brightness between images when I did a rotation.  I'm not sure how to
explain this, but it seems that from images of different angles, sometimes
the average brightness is consistent, but sometimes it suddenly drops and
the image would look about half as bright, and after a couple frames it
would light back up.

I'm guessing this is after each image is ray casted, it gets normalized to
a certain value, and that value changes depending on the angle?  Is there a
way to pin the brightness between images so if I make a movie it won't dim
and light up as I rotate?

Also I was wondering if I'm the only person to notice this? (the only other
post I found about volume render brightness is about AMR cell contributions)

From
G.S.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.spacepope.org/pipermail/yt-users-spacepope.org/attachments/20120227/8620d0ca/attachment.htm>