Here's Gilles grass placed on a HF

approx 10million blades of grass

4mins parse time
12 mins render time

Mick

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Attachments:
Download 'grass2.jpg' (190 KB)

Preview of image 'grass2.jpg'

All these grass rederings are very impressive. I have yet to look at the
code ( I will soon though, for sure.) I can't wait to it used on a fully
developed scene.
Heres an idea: using the same technique for generating large numbers of
objects, make a galaxy or a globular cluster.( You wouldn't have to have
billions of stars, I think a few million might do the trick.) With the right
media that might look pretty cool.
Halbert

"Mick Hazelgrove" <mic### [at] mhazelgrovefsnetcouk> wrote in message
news:395e124a@news.povray.org...
> Here's Gilles grass placed on a HF
>
> approx 10million blades of grass
>
> 4mins parse time
> 12 mins render time
>
> Mick
>
>
>

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It looks even nicer in the background. This will really complement scenes to
come. Hey, maybe I can go back and finish my Arda image the way I really
wanted to...

PS: How much memory did this consume?

PPS: Can someone add this as a 'primitive' to POV-Ray? Chris? Perhaps a
derivative of your particle system (just add the collision detection to this
and it's perfect).

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In article <395e124a@news.povray.org>, "Mick Hazelgrove" 
<mic### [at] mhazelgrovefsnetcouk> wrote:

> Here's Gilles grass placed on a HF
> 
> approx 10million blades of grass

It needs some radiosity to fill in the dark places between the blades. 
Or try placing a dim light source at the camera position(something I 
often do which produces better results than "ambient").

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TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
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In article <395e1a82@news.povray.org>, "Tony[B]" 
<ben### [at] panamac-comnet> wrote:

> PPS: Can someone add this as a 'primitive' to POV-Ray? Chris? Perhaps 
> a derivative of your particle system (just add the collision 
> detection to this and it's perfect).

I have been wondering about this myself...it should even be possible to 
recursively divide it into patches which would be generated on the fly, 
to save memory at the cost of rendering speed.

I am also thinking about cloth and gels...if anyone has information on 
these, it would be welcome.
BTW, I just finished the last touches on inter-particle forces and have 
begun testing.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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In Hand - just give me a few hours!

Mick

"Chris Huff" <chr### [at] maccom> wrote in message
news:chrishuff-A930D1.11391401072000@news.povray.org...
> In article <395e124a@news.povray.org>, "Mick Hazelgrove"
> <mic### [at] mhazelgrovefsnetcouk> wrote:
>
> > Here's Gilles grass placed on a HF
> >
> > approx 10million blades of grass
>
> It needs some radiosity to fill in the dark places between the blades.
> Or try placing a dim light source at the camera position(something I
> often do which produces better results than "ambient").
>
> --
> Christopher James Huff - Personal e-mail: chr### [at] maccom
> TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
> Personal Web page: http://homepage.mac.com/chrishuff/
> TAG Web page: http://tag.povray.org/

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> I am also thinking about cloth and gels...if anyone has information on
> these, it would be welcome.

For gels, Hugo Elias. For cloth, Xavier Provot.

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Well there goes all Samuel's hard work down the drain is all I can think.
Bitter-sweet.

Bob

"Mick Hazelgrove" <mic### [at] mhazelgrovefsnetcouk> wrote in message
news:395e124a@news.povray.org...
|
| approx 10million blades of grass
|
| 4mins parse time
| 12 mins render time

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Not at all, I'm  not sure I can adapt Gilles technique to the wind blown
grass of Samuals code with the same quality.

Mick

"Bob Hughes" <per### [at] aolcom?subject=PoV-News:> wrote in message
news:395e5995@news.povray.org...
> Well there goes all Samuel's hard work down the drain is all I can think.
> Bitter-sweet.
>
> Bob
>
> "Mick Hazelgrove" <mic### [at] mhazelgrovefsnetcouk> wrote in message
> news:395e124a@news.povray.org...
> |
> | approx 10million blades of grass
> |
> | 4mins parse time
> | 12 mins render time
>
>
>

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Ouch that does not look pleasant to step on...
I liked the slower grass better it had a softer look to it...
real grass not cut looks parallel until you get to the top where the
sides join and curve inward... hard to explain... ill make a pict...?
Mick Hazelgrove wrote:

> Here's Gilles grass placed on a HF
>
> approx 10million blades of grass
>
> 4mins parse time
> 12 mins render time
>
> Mick
>
>  [Image]

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> approx 10million blades of grass
>
> 4mins parse time
> 12 mins render time

holly frak!

nice as well!

Rick

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Rick wrote:
> 
> > approx 10million blades of grass
> >
> > 4mins parse time
> > 12 mins render time
> 
> holly frak!
> 
> nice as well!
> 
> Rick

ditto.

Alberto

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Wow.... That's really fast :) I'm going to have to dissect his code to
figure out how the blades were made, and how they were placed into the
mesh. His grass needs the eval_pigment add-on for directional rotation,
but it is very cool nontheless.

Mick Hazelgrove wrote:

> Here's Gilles grass placed on a HF
>
> approx 10million blades of grass
>
> 4mins parse time
> 12 mins render time
>
> Mick
>
>  [Image]

--
Samuel Benge

E-Mail: STB### [at] aolcom

Visit my isosurface tutorial at http://members.aol.com/stbenge

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No, I'll probably be expanding on Mick's and Gilles' findings :)

Bob Hughes wrote:

> Well there goes all Samuel's hard work down the drain is all I can think.
> Bitter-sweet.
>
> Bob
>
> "Mick Hazelgrove" <mic### [at] mhazelgrovefsnetcouk> wrote in message
> news:395e124a@news.povray.org...
> |
> | approx 10million blades of grass
> |
> | 4mins parse time
> | 12 mins render time

--
Samuel Benge

E-Mail: STB### [at] aolcom

Visit my isosurface tutorial at http://members.aol.com/stbenge

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Bob Hughes wrote:

> Well there goes all Samuel's hard work down the drain is all I can think.
> Bitter-sweet.

For the record, the eval_pigment technique was also discovered by Fabien
Mosen and published in the French-speaking POV group last February (in fact
Fabien has used it for his current IRTC image). I planned to add it as an
option to my own grass macro, but due to lack of time (and also because it
can only work using unofficial features, something I've tried to avoid when
publishing macros), it's been gathering dust on my hard disk since. I was
quite happy to have seen it discovered again by Samuel, and with very
impressive results, because this technique has really great potential (like
many things based on eval_pigment or eval_pattern) It just has to be worked
on to be made 100% practical. I'm very confident it can be done.

G.

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SamuelT wrote:

> Wow.... That's really fast :) I'm going to have to dissect his code to
> figure out how the blades were made, and how they were placed into the
> mesh. His grass needs the eval_pigment add-on for directional rotation,
> but it is very cool nontheless.

Not only rotation. It should be used to modify the scale and curvature of
the blades, and possibly the color too. I could also be very practical to
create "lumps" of grass sticking out from the flatter patches.
G.

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> For the record, the eval_pigment technique was also discovered by Fabien
> Mosen and published in the French-speaking POV group last February (in
fact
> Fabien has used it for his current IRTC image).

And now we know. BTW, have you noticed that when something is a good idea,
it gets "discovered" by many people almost simultanously?

> It just has to be worked
> on to be made 100% practical. I'm very confident it can be done.

I proposed this to Josh English over ICQ, but he has yet to post anything
about it: How about all the people who have worked on grass get together to
make the perfect grass macro/include? We could merge all the benefits of the
different macros/includes to put together something realistic and useful.
What do you say, Gilles, Josh, Samuel, others?

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Are you saying to use the eval_pigment to establish all the characteristics
of the blade at a given point? Good idea.

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Gilles Tran wrote:

> SamuelT wrote:
>
> > Wow.... That's really fast :) I'm going to have to dissect his code to
> > figure out how the blades were made, and how they were placed into the
> > mesh. His grass needs the eval_pigment add-on for directional rotation,
> > but it is very cool nontheless.
>
> Not only rotation. It should be used to modify the scale and curvature of
> the blades, and possibly the color too. I could also be very practical to
> create "lumps" of grass sticking out from the flatter patches.
> G.

As long as the scaling isn't done in conjunction with the rotation, otherwise
it can end up looking funny.


--
Samuel Benge

E-Mail: STB### [at] aolcom

Visit my isosurface tutorial at http://members.aol.com/stbenge

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I think everyone could make their own macros since most everyone knows all the
features like eval_pigment and such. Each person's macro would be different,
too. That way everyone else who wants to use the macros can choose a style.

"Tony[B]" wrote:

> How about all the people who have worked on grass get together to
> make the perfect grass macro/include? We could merge all the benefits of the
> different macros/includes to put together something realistic and useful.
> What do you say, Gilles, Josh, Samuel, others?

--
Samuel Benge

E-Mail: STB### [at] aolcom

Visit my isosurface tutorial at http://members.aol.com/stbenge

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Well, like I said, this macro would include all the benefits of the previous
ones in one file. That would mean you could chose from a wide variety of
styles and whatnot.

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Just curious, how did you get the grass aligned with the heightfield?

YannMick Hazelgrove wrote:
> 
> Here's Gilles grass placed on a HF
> 
> approx 10million blades of grass
> 
> 4mins parse time
> 12 mins render time
> 
> Mick
> 
>  [Image]

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Yann Ramin wrote:
> 
> Just curious, how did you get the grass aligned with the heightfield?
> 

[snip]

I would think megapov's hf_height_at function (correct me if i'm wrong)

BTW, your sig is really very long for a short question ...

Christoph

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