Anyone have any idea how to code a Ribbon?
A finite plane, maybe? I'm thinking of something like this...

					    ________
________				   /
      	\	    ________		  /
	 \_________/	    \            /
			     \__________/


Well, you get the idea (I hope, anyway...) This isn't exactly what I
want to do at all... just to give you the idea of what I want to do with
this.
	The  '\''s are supposed to be gentle slopes.... and I'd like to move
this in the Z plane as well (in and out of the page). *Any* ideas or
help would be more than appreciated... I don't want to do this with a
spline or primatives... a finite plane is kind of what I'm thinking
about (although how I'd manipulate it to that extent isn't something I'm
sure of yet, either... am I unprepared or what? :) I had a brainwave of
an idea and couldn't think of how to do this...)

So, please... any help is greatly apreciated.

Saif
-- 
"And so I throw the windows wide and call to you across the skies."
-pink floyd.

"All that we see or seem, is but a dream, within a dream."
-Edgar Alan Poe.

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Harumph.

Well, I've just proven I'm lousy at ASCII art. :P
That'll teach me to use the Tab key. :) Ignore that part please... I
still hope you get the point... help. :)

-- 
"And so I throw the windows wide and call to you across the skies."
-pink floyd.

"All that we see or seem, is but a dream, within a dream."
-Edgar Alan Poe.

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Saif Ansari wrote:
> 
> Harumph.
> 
> Well, I've just proven I'm lousy at ASCII art. :P
> That'll teach me to use the Tab key. :) Ignore that part please... I
> still hope you get the point... help. :)
> 
> --
> "And so I throw the windows wide and call to you across the skies."
> -pink floyd.
> 
> "All that we see or seem, is but a dream, within a dream."
> -Edgar Alan Poe.

Using ripples?

Is there any way to apply a ripple or wave texture to a plane, then
scale or somehow stretch parts of the plane to produce larger
deformations?

Or maybe a very smooth heightfield?

I'm too much of an amateur to offer more than wild stabs in the dark,
sorry.

Mark

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Mark Mealman and Saif Ansari discussed about a ribbon.
> Using ripples?

Nope. Ripples just change the normal of the surface, and do not move the
surface itself.

> Or maybe a very smooth heightfield?

That could work. You can even use POV-Ray to generate your height field
image: put a plane in front of the camera, and give it a texture like:
texture {
  finish {
    ambient 1
    diffuse 0
  }
  pigment {
    gradient y
    colour_map { ... }
  }
}

With the colour map adequately defined, that produces good output.

Other possibility: you could use a bicubic patch. A little bit harder to
control, but it gives splendid results. I once used them, but I cannot
remember the precise syntax. Anyway, the docs are quite clear on this point.

Happy tracing,
  B-o-b
--

bob### [at] casimirrezelenstfr -- Linux, POV-Ray, LaTeX

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Get spatch, it is a Spline patch modeller, and can output to pov bicubic
patch objects, I can't remember the url right now thought, perhaps GrimDude
will help? He know everything ;-)

-- 
Tristan Wibberley

(Remove the '.NO_LUNCHEON_MEAT' from my
email address to reply.)

Roland Mas <bob### [at] clodomirrezelenstfr> wrote in article
<6aknoh$m32$4@melchior.Cuivre.FR.EU.ORG>...
| Mark Mealman and Saif Ansari discussed about a ribbon.
| > Using ripples?
| 
| Nope. Ripples just change the normal of the surface, and do not move the
| surface itself.
| 
| > Or maybe a very smooth heightfield?
| 
| That could work. You can even use POV-Ray to generate your height field
| image: put a plane in front of the camera, and give it a texture like:
| texture {
|   finish {
|     ambient 1
|     diffuse 0
|   }
|   pigment {
|     gradient y
|     colour_map { ... }
|   }
| }
| 
| With the colour map adequately defined, that produces good output.
| 
| Other possibility: you could use a bicubic patch. A little bit harder to
| control, but it gives splendid results. I once used them, but I cannot
| remember the precise syntax. Anyway, the docs are quite clear on this
point.
| 
| Happy tracing,
|   B-o-b
| --

| bob### [at] casimirrezelenstfr -- Linux, POV-Ray, LaTeX
|

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, perhaps GrimDude
>will help? He know everything ;-)
>
>--
>Tristan Wibberley

Excuse me? That sounds like a dig, Tristan.

http://www.aimnet.com/~clifton/spatch.html

--
Paul Hinds
gri### [at] swbellnet

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Hi,
Nononono!

I mean it, when ever someone has a problem with a scene you can always
help!

-- 
Tristan Wibberley

(Remove the '.NO_LUNCHEON_MEAT' from my
email address to reply.)

GrimDude <grimdude&nos### [at] swbellnet> wrote in article
<34e1e09e.0@news.povray.org>...
| , perhaps GrimDude
| >will help? He know everything ;-)
| >
| >--
| >Tristan Wibberley
| 
| Excuse me? That sounds like a dig, Tristan.
| 
| http://www.aimnet.com/~clifton/spatch.html
| 
| --
| Paul Hinds
| gri### [at] swbellnet
| 
| 
| 
|

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Well, almost always.

-- 
Tristan Wibberley

(Remove the '.NO_LUNCHEON_MEAT' from my
email address to reply.)

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heh, NOT! :)
  Just like everyone else I occasionally taste shoe leather.

--
Paul Hinds
gri### [at] swbellnet

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