Hi everyone,

Is it possible to use a background bitmap in POV? I can only find
documentation for background colour etc

Thanx....

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I would use an image map on a polygon with the once keyword.  If the
bitmap tiles, putting it on a plane without the once keyword can work. 
Use type 0 for planar image mapping.  If you tile the bitmap on a plane
the once keyword is not needed.
Brendan

polygon
{
...
   pigment
   {
      image_map
      {
         png "yourfile.png"	//there's also tga and others (sys for
system specific format such as bmp for windows)
         type 0			//the default, so it doesn't need to be typed
         once			//makes one copy of bitmap cover the whole polygon
      }
   }
}

Brendan

ReeF wrote:
> 
> Hi everyone,
> 
> Is it possible to use a background bitmap in POV? I can only find
> documentation for background colour etc
> 
> Thanx....

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Andrea Ryan wrote:
> 
> I would use an image map on a polygon with the once keyword.  If the
> bitmap tiles, putting it on a plane without the once keyword can work.
> Use type 0 for planar image mapping.  If you tile the bitmap on a plane
> the once keyword is not needed.
> Brendan

Oh, sorry for repeating myself with the once keyword.  I referred to it
concerning planes twice instead of *once*! :)
I was thinking about what a bitmap would look like all stretched out on
a plane.
Brendan

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Thanx Andrea, I'll try that

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I have a method for doing this at:

http://www.spiritone.com/~english/cyclopedia/background.html

Josh English
eng### [at] spritonecom

ReeF wrote:
> 
> Hi everyone,
> 
> Is it possible to use a background bitmap in POV? I can only find
> documentation for background colour etc
> 
> Thanx....

Post a reply to this message

On Wed, 5 Dec 2001 16:30:06 +1000, ReeF wrote...
> Thanx Andrea, I'll try that

Umm, That was Brendan (I assume from the last word in his post)

Bye for now,
     Jamie.

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hi josh,

your tutorial is excellent.  but can you tell me what the
<span class="code"> stuff is?  i assume its an html tag
that somehow didn't get interpretted correctly by my IE6,
but i'm not familiar with it.

thanks, miker


"Josh English" <eng### [at] spiritonecom> wrote in message
news:3C0E59CD.FAEA4D5F@spiritone.com...
> I have a method for doing this at:
>
> http://www.spiritone.com/~english/cyclopedia/background.html
>
> Josh English
> eng### [at] spritonecom
>
> ReeF wrote:
> >
> > Hi everyone,
> >
> > Is it possible to use a background bitmap in POV? I can only find
> > documentation for background colour etc
> >
> > Thanx....

Post a reply to this message

Wasn't it MR who wrote:
>hi josh,
>
>your tutorial is excellent.  but can you tell me what the
><span class="code"> stuff is?  i assume its an html tag
>that somehow didn't get interpretted correctly by my IE6,
>but i'm not familiar with it.

IE6 would interpret it correctly if he had typed it right.
It should be <span class="code">, but it actually says <span
class="code">, which gets displayed as <span class="code"> on the
browser rather than being interpreted as invoking the span.code style
from the cascading style sheet.

The same sort of thing happens with some of the links.

As a wild guess, I think he might have copied and pasted some of the
tags between two different editors, only one of which was HTML-aware.

-- 
Mike Williams
Gentleman of Leisure

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"ReeF" <ree### [at] netscapenet> wrote in news:3c0d5e81@news.povray.org:

> Is it possible to use a background bitmap in POV? I can only find
> documentation for background colour etc

It is possible to do this in camera in Pov with a minimum of hassle only in 
situations where you can determine the exact extents of the camera 
viewport.  In situations where you can do this, just put an image_mapped 
plane or polygon behind the other objects in your scene.

If you can't easily determine the extents of the viewport (e.g. because the 
camera isn't axially aligned, has a non-standard angle or isn't perspective 
or othographic), by far the best option is to render to with alpha and 
composite the background after rendering.

It is possible to composite images in Pov if you can't use or don't have a 
suitable image editor.

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