On 11/3/23 12:49, Mike Miller wrote:
> I've run into a problem with the
> transparent portion of the png when turning on fog. The fog is tinting the
> billboard shape.
The fog feature is a faked effect which works, solely, with initial
camera rays. More specifically fog is added using the distance from the
camera to the first intersection - or effective infinity (2,000,000
units?). Those initial camera rays will intersect the billboards whether
the pigment is transparent or not.
So, I'm not surprised the bill board tint is different, but at this
moment, I don't understand why it appears to be more foggy rather than
less. Most probably your fog is set up to be more dense at distance (not
Maybe we'd get what you see, if using ground fog that is not oriented
correctly? Not sure. Could be some bug too - there are some in the
official POV-Ray code - and probably some unknown ones still in my
playpen code too. Faked effects are tricky.
In any case, distance based features will struggle with a "billboards
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