eerie...

I just posted the same problem on povray.general  - I uploaded a couple of images
- take a look.
Same problem? (nb my pipes are bicubic patches - from sPatch)

I used a standard texture T_Silver_5B (ok, I changed the roughness from 1/60 to
1/20 - but thats all)

I doubt the problem is that which Nieminen describes. All my patches have
flatness 0 and we're not getting spots or cracks, its a nice smooth (but
unwanted) light

David

Nieminen Mika wrote:

> J. L. Rose <jro### [at] spamBgonenbnetnbca> wrote:
> : I was trying to make this image using a bent-up bicubic patch, and
> : noticed some odd bright and dark spots on it.
>
>   From the povray documentation:
>
> As POV-Ray processes the Bezier patch it makes a test of the current piece
> of the patch to see if it is flat enough to just pretend it is a rectangle.
> The statement that controls this test is flatness. Typical flatness values
> range from 0 to 1 (the lower the slower).
> ...
> There are both advantages and disadvantages to using a non-zero flatness.
> ...
> The biggest disadvantage is that if POV-Ray stops subdividing at a particular
> level on one part of the patch and at a different level on an adjacent part
> of the patch there is the potential for cracking. This is typically visible
> as spots within the patch where you can see through. How bad this appears
> depends very highly on the angle at which you are viewing the patch.
>
> --
>                                                            - Warp. -

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