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My IRTC anim entry that have been doing my head in this week, so inspired by
David Fontaine's 'Orange Wedge' and Tor Olav Kristensen 'Bonds' and 'Other
Bonds' I decided to take the weekend off animating, and render myself some
new marbles to replace those I'm loosing.
I'm trying to give the surface of the marble a well-used look, with varying
degrees of success. The marble on the left I like, but it's not quite
right - dunno why. The one on the right - though it looks wonderfully old,
doesn't look like it should be in one piece anymore. I'm trying to get
something between these two - cracks rather than dents, but not so badly
cracked that the whole surface is covered.
Any suggestions on how to improve the look ? Would I do better to create
myself some solid cracks, and CSG these out of the surface rather than
trying to do it with a normal ?
(N.B. Current normals (for 1 untit radius spheres) are:
Left_marble=normal { crackle 1 poly_wave 3 normal_map {
[ 0 crackle 0 poly_wave 3 ]
[ .3 crackle 0 poly_wave 3 ]
[ .3 crackle -1 poly_wave 3 ]
[ 1 crackle -1 poly_wave 3 ]
} scale .05 }
Right_marble=normal { crackle 1 normal_map {
[ 0 crackle .5 ]
[ .1 crackle .5 ]
[ .1 crackle 0 ]
[ 1 crackle 0 ]
} scale .1 }
)
Render time 1hr 12mins on a PII 450 using POV-Ray 3.1g.
--
Duncan Gray
(warning: may contain traces of nut)
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Attachments:
Download 'marbles.jpg' (21 KB)
Preview of image 'marbles.jpg'
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I'd say the on the left looks excellent, and I wouldn't think a glass marble
would crack without shattering completely. Then again, I never played with
marbles much.
Well done.
--
Dan D.
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Where are the photons and dispersion???
Of course ... great work ...
If you'd render it in 1024x768, I'd take it as wallpaper ... *g
--
plane{y,0 pigment{color rgb 1}}camera{location<1,5,-2>look_at
0}light_source{10 color 1}#macro m(a,b,c,n,i)#if(i=0)cylinder{a,b,c/3
pigment{color rgb z}}#else #local f=vlength(a-b)/32;#local d=(b-a)/8;#local
e=(vcross(d,n)/vlength(vcross(d,n)))*f*4;m(a-e,a+2*d+e,f,n,i-1)m(a+e,a+2*d-e
,f,n,i-1)m(a+3*d-e,a+3*d+e,f,n,i-1)m(a+3*d-e,a+5*d-e,f,n,i-1)m(a+6*d-e,a+6*d
+e,f,n,i-1)m(a+8*d-e,a+8*d+e,f,n,i-1)#end #end m(-4*x,2*x,1/8,y,4) // Jan
Walzer
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ddombrow wrote:
> I'd say the on the left looks excellent, and I wouldn't think a glass
marble
> would crack without shattering completely. Then again, I never played with
> marbles much.
I've used the wrong term really, my mistake. Crack does imply some depth to
the damage, and if a marble were found in this state, then it would surely
become two fractions of a marble next time it were dropped.
Perhaps scratched would perhaps better describe the effect I'm searching
for. Does anyone out there have access to any well used marbles; can you
check should I be going for scratched and chipped, or just chipped ?
I'm thinking also that I've got the coloured bit all wrong as well. Should
be more ribbon-like, less solid.
Think I best head for the toy shop this week and remind myself what they
look like !
Thanks for your thoughts.
--
Duncan Gray
(warning: may contain traces of nut)
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Jan Walzer wrote:
> Where are the photons and dispersion???
> Of course ... great work ...
> If you'd render it in 1024x768, I'd take it as wallpaper ... *g
photons and dispersion ... ummm ... am I missing something here, can't find
them in the manual; I'm using POV-Ray 3.1g, is this something I need MegaPov
for ?
I do have an area spot-light currently commented out in the scene, It helps
to bring out the faked caustics but it takes it from a 2 hour render up to
about 8 hours. As I'm still concentrating on the surface I need to cut the
render time so the scene is lit with a point light at the moment.
Re wallpaper, that's exacly what it's intended for - I've just bought myself
a new laptop and I'm sick of looking at the compaq logo already, so I
decided to thoroughly test the machine by rendering the weekend away on it;
ray-tracing itself a new wallpaper. I'll post @1024x768 when finished if you
like.
Cheers.
--
Duncan Gray
(warning: may contain traces of nut)
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Duncan Gray wrote:
>
>...
>I'll post @1024x768 when finished if you like.
Yes please.
--
Best regards,
Tor Olav
mailto:tor### [at] hotmail com
http://www.crosswinds.net/~tok
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Duncan Gray wrote:
>
> ddombrow wrote:
> > I'd say the on the left looks excellent, and I wouldn't think a glass
> marble
> > would crack without shattering completely. Then again, I never played with
> > marbles much.
>
> I've used the wrong term really, my mistake. Crack does imply some depth to
> the damage, and if a marble were found in this state, then it would surely
> become two fractions of a marble next time it were dropped.
>
> Perhaps scratched would perhaps better describe the effect I'm searching
> for. Does anyone out there have access to any well used marbles; can you
> check should I be going for scratched and chipped, or just chipped ?
The marbles found in aerosol paint cans look just like the one on the
right.
>
> I'm thinking also that I've got the coloured bit all wrong as well. Should
> be more ribbon-like, less solid.
Yes.
--
Francois Labreque | //\\ Wear an ASCII ribbon!
flabreque | || ||
@ | \\// Support the campain
videotron.ca \\ against HTML e-mail
//\\ and news!
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Those are nice. I've been trying to do a few marbles myself lately, but
you're way ahead of me.
Setep
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I think the left one is much better. Glass is pretty resistant to deformation,
at a certain level of stress it'll just break.
From what I remember of my marbles, back before I lost 'em, the colored part is
much more two-dimensional. What I would do; imagine spinning a disc to make a
sphere, but instead of tracing out infinite copies of the disc, trace out some
number like three. Then take this whole thing and twist it around the same axis
you spun the disc around, so you get a multiple helix thing, with edges along a
sphere or ellipsoid.
--
David Fontaine <dav### [at] faricynet> ICQ 55354965
My raytracing gallery: http://davidf.faricy.net/
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These look very nice but the swirly coloured patterns (I'm trying to use the
correct terminology here) don't look like any marbles that I used in my
youth. The patterns that I remember were more like leaves with two or three
twisted slightly.
Chips and scratches were very common, given that concrete and ashphalt were
the kinds of surfaces played on. The one on the right looks too severe, the
one on the left is better but probably needs more. I don't ever remember a
marble breaking so they must have been very resistant to cracking.
Does anyone remember the names of the different types of marbles and their
relative values. There was a hierarchy but can't remember, other than that
the ones shown were the basic marble with the lowest value. Other types that
were higher value were :
- Dobbers (same as basic but approx twice? the diameter).
- Transparent (both normal and dobber size) in various colours
- Transparent with small bubbles.
- Opaque (white was popular), sometimes with swirly patterns on the outside.
- Ballbearings (metal both normal and dobber size)
Can anyone remember any other marble jargon ?
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