I updated the raytracing section of my website:

http://www.schunter.etc.tu-bs.de/~chris/raytracing.html

It now contains the following new (or updated) sections:

 - Povray's warp statement - black_hole warps 
 - Povray's warp statement - displace warps 
 - Povray's crackle pattern - crackle metric/offset 
 - Povray's crackle pattern - crackle form 
 - MegaPov's glow function 
 - MegaPov's radiosity 

Hope you find things useful, comments welcome as usual, 

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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In article <39E49616.3871675D@schunter.etc.tu-bs.de>, 
chr### [at] gmxde wrote:

> It now contains the following new (or updated) sections:
>  - Povray's warp statement - displace warps 

A very complete set of examples...but I think MegaPOV 0.6 has an older 
version. I have added a second displacement method which you should find 
interesting: it uses the differences in brightness of the control 
pigment's color to push the texture around.


>  - MegaPov's glow function 

In addition to types 2 and 3 not being complete, the size keyword 
doesn't seem to always work correctly, you may want to warn about this. 
Currently, the best way to control the size is with the brightness.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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Chris Huff wrote:
> 
> A very complete set of examples...but I think MegaPOV 0.6 has an older
> version. I have added a second displacement method which you should find
> interesting: it uses the differences in brightness of the control
> pigment's color to push the texture around.
> 

Oh thanks, I knew there was something more but i did not remember what it was
when reading the mp06 docu.  Will it be added to Megapov/Povray 3.5 ?
Anyway i'm going to check it out.

> >  - MegaPov's glow function
> 
> In addition to types 2 and 3 not being complete, the size keyword
> doesn't seem to always work correctly, you may want to warn about this.
> Currently, the best way to control the size is with the brightness.
> 

I did not include type 2&3 for that reason, with the size keyword i do not
remember having any problems, when do they occur ?

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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In article <39E56FEA.9E4A219F@schunter.etc.tu-bs.de>, 
chr### [at] gmxde wrote:

> Oh thanks, I knew there was something more but i did not remember 
> what it was when reading the mp06 docu.  Will it be added to 
> Megapov/Povray 3.5 ?

The new version might be in the next version of MegaPOV, but I doubt the 
displace warp will make it into 3.5.


> I did not include type 2&3 for that reason, with the size keyword i 
> do not remember having any problems, when do they occur ?

I noticed problems when an object was behind the glow: the distance of 
objects behind the glow seems to interfere with the size of the glow.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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Chris Huff wrote:
> 
> The new version might be in the next version of MegaPOV, but I doubt the
> displace warp will make it into 3.5.
> 

That sounds ok to me, although it's a really powerful feature ...

BTW, I just put an additional table for 'type 1' to the displace warp section on
my website.

> > I did not include type 2&3 for that reason, with the size keyword i
> > do not remember having any problems, when do they occur ?
> 
> I noticed problems when an object was behind the glow: the distance of
> objects behind the glow seems to interfere with the size of the glow.
> 

I will try to check that out.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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In article <39E968FE.C8D6B30E@schunter.etc.tu-bs.de>, 
chr### [at] gmxde wrote:

> That sounds ok to me, although it's a really powerful feature ...

It just came along too late...


> BTW, I just put an additional table for 'type 1' to the displace warp 
> section on my website.

It looks like you know my patch better than I do... :-)
Some neat effects...I wonder if the displace patch would be useful in 
making those tiling procedural patterns.


> I will try to check that out.

I have a pretty good idea of the problem, I know I am scaling the wrong 
values...I just have to reverse engineer the equations to figure out 
what to scale.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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Chris Huff wrote:
> 
> It looks like you know my patch better than I do... :-)
> Some neat effects...I wonder if the displace patch would be useful in
> making those tiling procedural patterns.
> 

I posted something like that some days ago to p.b.i:

Subject: again more pattern fun ... (29+29+33k)
Date:    Mon, 02 Oct 2000 15:54:11

As said there it's not very easy to control, especially if you work with several
displace warps.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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In article <39E9D8AE.EE89D159@schunter.etc.tu-bs.de>, 
chr### [at] gmxde wrote:

> As said there it's not very easy to control, especially if you work 
> with several displace warps.  

Unfortunately, I don't think there is any solution for this. The idea of 
using color values as displacement amounts is likely to confuse anyone 
who doesn't understand exactly how warps work, since it gives you direct 
control over the values used. The second type of displacement warp 
should be easier to understand, since colors aren't considered 
directions and distances, it just pushes the pattern toward or away from 
areas depending on their brightness.
Still, it is a lot more complex than, say, glows or black hole warps.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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