I need to make a hemispherical dome with a thin metallic surface,
similar to a pocket watch cover, and pierce it with simple shapes. Can
anyone advise on how to do this please? (The piercing of these shapes
must not interfere with other nearby objects if possible, as the shape
holes are making way for other objects to poke through).

Many thanks for all the help I've received here so far

Matt.

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Try doing a CSG-ed sphere, like the following:

difference {
	sphere { bla bla bla  --- make is big}
	box { bla bla --- to cut everything but the top of the sphere }
}

and then difference that shape with whateer you want.

Matt Moose wrote:
> 
> I need to make a hemispherical dome with a thin metallic surface,
> similar to a pocket watch cover, and pierce it with simple shapes. Can
> anyone advise on how to do this please? (The piercing of these shapes
> must not interfere with other nearby objects if possible, as the shape
> holes are making way for other objects to poke through).
> 
> Many thanks for all the help I've received here so far
> 
> Matt.

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In article <38fb6f9e.5001681@news.povray.org>, mrr### [at] sphericademoncouk 
(Matt Moose) wrote:

> I need to make a hemispherical dome with a thin metallic surface,
> similar to a pocket watch cover, and pierce it with simple shapes. Can
> anyone advise on how to do this please? (The piercing of these shapes
> must not interfere with other nearby objects if possible, as the shape
> holes are making way for other objects to poke through).
> 
> Many thanks for all the help I've received here so far

Hmm, just use CSG:

difference {
    difference {
        sphere {< 0, 0, 0>, 1}// the dome

        sphere {< 0, 0, 0>, 0.95}// hollow it out
        plane {y, 0}// chop half of it off to make a hemisphere
        scale < 1, 0.5, 1>// flatten it a bit if you want
    }

    cylinder {< 0, 0, 0>, < 1, 1, 0>, 0.3}// chop whatever shapes you
    cylinder {< 0, 0, 0>, <-1, 1, 0>, 0.3}// want out of it.
}

If the dome is really a hemisphere, you can just remove the scale and 
the outer difference and place the cutting shapes inside the inner 
difference. Or you could place the scale inside the two sphere 
statements...there are many possible ways to do it.

-- 
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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Amazing, I actually knew a Matt Moose once. You didn't live in the USA,
and in California once, did you?

Matt Moose wrote:

> I need to make a hemispherical dome with a thin metallic surface,
> similar to a pocket watch cover, and pierce it with simple shapes. Can
> anyone advise on how to do this please? (The piercing of these shapes
> must not interfere with other nearby objects if possible, as the shape
> holes are making way for other objects to poke through).
>
> Many thanks for all the help I've received here so far
>
> Matt.

--
Samuel Benge

E-Mail: STB### [at] aolcom

Visit the still unfinished isosurface tutorial:
http://members.aol.com/stbenge

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csg 2 spheres, one inside the other, then csg that with a plane or box, so
you end up with half a tennis ball, then scale the whole thing so you get
half a squashed tennis ball.

then adjust the inner sphere radius (allong th same axis as your cutting
box) so you get a more uniform thickness

then just csg that with all your cut out objects, and volia one buck shot
half a squashed tennis ball.

Rick

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Thanks people, that's got me going again.
Respect due!
PS. No I've never been to California, but I hear it calling me...

Matt Moose

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Matt Moose wrote:

> PS. No I've never been to California, but I hear it calling me...

Do not give in to the dark side, Luke.

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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