"DZ" wrote:
> Wow, that's cool! But how can suprimposed
> heightfields create the blade-like shapes?

It's actually not the superimposed heightfields that does it. One
heightfield would be enough, but then the horizon would not be fuzzy, and
that would reveal the illusion.

The trick lies in the special function used for the pigment. It, well, sort
of simulates 3d blades of grass being projected onto a 2d plane using
perspective projection. How to do that is something you know if you have the
ability to twist the concept of 3d around your little finger. Ok, just
kidding, but it's a bit difficult to explain... ;)

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Mar 19)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk

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I downloaded the source from your website. 3dnoise and sin/cosine-- that's
brilliant! Acres and acres of cheap, verdant POV real estate.

Nice job.

DZ



Rune wrote:

> The trick lies in the special function used for the pigment. It, well, sort
> of simulates 3d blades of grass being projected onto a 2d plane using
> perspective projection.

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"DZ" wrote:
> I downloaded the source from your website. 3dnoise
> and sin/cosine-- that's brilliant! Acres and acres
> of cheap, verdant POV real estate.

Thanks. :)

Though, the file on my website is my old Fast Grass Include File.

What I'm working on now is a better-looking technique which makes more
realistic grass which also work in animations. It's a bit slower though...

Rune
--
3D images and anims, include files, tutorials and more:
Rune's World:  http://rsj.mobilixnet.dk (updated Mar 19)
POV-Ray Users: http://rsj.mobilixnet.dk/povrayusers/
POV-Ray Ring:  http://webring.povray.co.uk

Post a reply to this message