Dick Balaska <dic### [at] buckosoftcom> wrote:

> Huh. There is an unexpected black frame here. Wild that I never noticed
> it before. :) :(  (I mean, how many hundreds of times have I looked at
> these individual frames...)

Right - the tendency to "read through" stuff like that due to [over]familiarity
is why they always say to have someone else proofread your stuff for you.


> This one's on purpose.

There's a jarring "blip" around 9:18 where the eel kinda hits the water surface.
 I watched it in Media Player, but I remember seeing another very dark frame or
two in the weeds when I watched it with VLC.   Maybe it's more pronounced in one
than the other.  I'll have to see if I can watch it in 1/2 - 1/4 speed, or step
through it frame by frame.

It would be interesting to have an output statistic in POV-Ray which summed all
the RGB values of the pixels and then divided by the number of pixels to give an
overall "brightness" value.  It probably wouldn't add much to the render time
since it's rendering pixel by pixel anyway...

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Dick Balaska <dic### [at] buckosoftcom> wrote:
> [...], I don't get what that weird shadow is on
> the sides near the middle of the tub [...].

On this web page (That's all in french, but I 'try' to give explanations in
english below):
http://povray.free.fr/quatre/index4.html

Take a look at this part of the page at the bottom :






Here the author of this page says that if two materials (here, the mint syrup
and the glass) have some surfaces in common there will be black, gray or white
stains that will appear, the solution there is to apply a scale with the value
of 0.99 , 0.999 or something like that, to separate the materials. In your
example (the bathtub), you can apply that scale value of 0.999 and that 'should'
work. I'm not sure that this is the problem you're facing, but who knows ?

PS: I read the in between posts , but didn't find the above solution, so in case
that helps. ;-D

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"Warren" <nomail@nomail> wrote:

> Here the author of this page says that if two materials (here, the mint syrup
> and the glass) have some surfaces in common there will be black, gray or white
> stains that will appear, the solution there is to apply a scale with the value
> of 0.99 , 0.999 or something like that, to separate the materials.

That would be the infamous "coincident surfaces" problem - but I doubt that
applies here.

There may be some other strange thing going on, but of course, without code, or
a detailed look at the rest of the scene - it's hard to know.

I'd isolate the bathtub and the light source in a separate [include] file and
render it in an animation with the camera looking at the tub, and going around
it in a circle.

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