In article <390367b6@news.povray.org>, "Alf Peake" 
<alf### [at] peake42freeservecouk> wrote:

> I was having another try at smoothly joining 2 different sized pipes 
> or tubes at rightangles when I hit this problem - one tube developed 
> large holes in it. Open or closed cylinders made no difference but 
> they do change with camera angle or RadW. I used DOS versions of mpov 
> 0.4 and pov 3.1g.

Since this isn't a programming question, you should probably have posted 
it to povray.advanced-users.
Anyway, it sounds like a coincident surfaces problem. I haven't had a 
chance to examine the source in detail, but make sure you always have 
some overlap, and avoid having two surfaces occupy the same region of 
space(intersecting surfaces are fine of course, but if a larger area is 
coincident, POV has trouble deciding which one to render or whether to 
remove a surface).

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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In article <390367b6@news.povray.org> , "Alf Peake" 
<alf### [at] peake42freeservecouk> wrote:

> I was having another try at smoothly joining 2 different sized pipes or tubes
> at rightangles when I hit this problem - one tube developed large holes in it.
> Open or closed cylinders made no difference but they do change with camera
> angle or RadW. I used DOS versions of mpov 0.4 and pov 3.1g.
>
> Also - if object{ Pipes } is used when declared instead of in the difference
> the weld / seam will be different and shows correctly.
>
> Any ideas where the problems are please?
>
> As my project is intended to be hollow glass I think I'm in trouble anyway
> with this idea. Or am I trying to re-invent the wheel?

This is the wrong group to ask this.  Please take the time and read the
message  "Welcome To the POV-Ray News Groups" in the povray.announce.
frequently-asked-questions group.

    Thorsten

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Chris Huff <chr### [at] yahoocom> wrote in message
news:chrishuff_99-A69047.13385324042000@news.povray.org...
>
> Since this isn't a programming question, you should probably have posted
> it to povray.advanced-users.
Sorry Chris, as usual I wasn't sure where it should have gone.

> Anyway, it sounds like a coincident surfaces problem. I haven't had a
> chance to examine the source in detail, but make sure you always have
> some overlap, and avoid having two surfaces occupy the same region of
> space(intersecting surfaces are fine of course, but if a larger area is
> coincident, POV has trouble deciding which one to render or whether to
> remove a surface).
>
In my WeldSeam declaration, the loop increment can be increased to 200 to give just a
couple of passes. This speeds things up. If RadW is increased slightly, the yellow
cylinder will almost disapear.

Alf

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