Pixel Shader fractals possible?

[bdrv]

http://blogs.msdn.com/shawnhar/archi...or-julias.aspx

how much of this code needs to change to work in milkdrop?

it's only 20 lines, is it possible?

float4 PixelShader(float2 texCoord : TEXCOORD0) : COLOR0
{
float2 c = (texCoord - 0.5) * Zoom * float2(1, Aspect) - Pan;
float2 v = 0;

float m = 0;

const float r = 5;

for (int n = 0; n < Iterations; n++)
{
v = float2(v.x * v.x - v.y * v.y, v.x * v.y * 2) + c;

if (dot(v, v) < (r*r - 1))
m++;

v = clamp(v, -r, r);
}

if (m == Iterations)
return 0;
else
return float4(sin(m/4), sin(m/5), sin(m/7), 1) / 4 + 0.75;
}

This renders fractals in glorious technicolor:

[Flexi]

waaah, i just read the headline and thought you read my mind last night!...

no way, not with pixelshader2.0. There are only 64 Operations and we have no loops.
Maybe someday when people will have more powerful graphics cards and Geiss launches a new MD version for higher pixelshader levels...

BUT...
some basic ferns are possible: check out this one! (it's about eight hours old...)

[Flexi]

oh yeah, fine fractals possible with shaders...

[bdrv]

ferntastic!!! so its not possible to plot a xy graph of mandelbrote set?

[Flexi]

nope. not with the algorithms i know.
It twisted my mind for so long now, if there's a dirty way with a wicked uv-transformation... but all i got was some serious headaches.
Rovastars Fractopia points in this direction, but i didn't play much with it, and if i'm right there will never be a deep dive-in like mad.

[Flexi]

oops, i forgot something

this is soulfood!

[bdrv]

woah thats very complicated!
oops it's 1000ds of iterations in sequence to do mendel...
here is a little remix

[Flexi]

nice one!

mashed up with the ferntasy color mapping and some manual finetuning...
but that should be enough for today...

[Rovastar]

Originally posted by Flexi
oh yeah, fine fractals possible with shaders...

?? The screen for this just goes all yellow in about 0.5 seconds?

nvidia 7600GT

same with fractrip

[Rovastar]

did a quick tweak to your aftermath one to add some audio reactivity still needs some work but a building block

[Flexi]

disturbing mix.

argh - i made these presets on my radeon9600, where texture wrap only works with a workaround - replace all the sampler_main with sampler_fc_main to avoid mirroring to death... thx for that hint, will fix it.

in 2 weeks i will get a new PC with a HD3870. Is it sick to be thrilled for a new PC for... Milkdrop?

here's the most current of its kind.
can you please tell me whether it runs as it should.

[Rovastar]

that one looks ok

nice btw

[Rovastar]

and a quick mix. Just getting to know what you did to create it.....

[Flexi]

hehe these 4 multiplications are too much for my old video card... (no PS3.0 support)
basically it's a rebuild of textured custom shapes but with a twist:
custom shapes have no option to change the aspect ratio and i also did some tricks - green and blue channels are feeded by the red one, where the main fern lies in.

the rest is simple: greyscale the rgb input and mapping a palette with a polynome on the grey value.

btw - here's a similar fractal with custom shapes only

[Rovastar]

Yeah sorry I made it a PS3.0 version as I just cut and pasted variables. I should make it a more efficent one using only a few extra operations.

[bdrv]

AWESOME! those are some fine graphics.
this is cool:

[Flexi]

truly cool preset, but very slow on my machine.


...I couldn't resist...

[Rovastar]

Getting the hang of it now.

Keep it down to PS level 2.0 too.

[bdrv]

here is a conway inside a spiral...

[bdrv]

a small mod...

[Flexi]

...a fractal too...

[bdrv]

it looks like a volcano !

[Flexi]

yeah! fractal foam and sponges...

[Flexi]

....
...

[Flexi]

okay, here's a quest:

The first one who adds a cool random dithering effect to the composite shader, wins a lollipop!

[Flexi]

[Stahlregen]

and look at the cute things you can do with a little mashup...

[Flexi]

I've got it

hehe, actually not. this isn't the Mandelbrot but a Julia set.

Go play with the shader code! - i want to see some cool spots to finally colorize em.
here's a map:
http://upload.wikimedia.org/wikipedi...ia-Teppich.png
http://en.wikipedia.org/wiki/Julia_set

be careful with the zoom var, it needs some sure instinct to find the right setting.
You can also play with the color fade: try different dynamic ranges for the 3 channels.

But now have fun!

[Flexi]

and one colored attempt.

[Flexi]

the future?

[Flexi]

so that must be enough material for now

[Flexi]

now lean back and let this one kick your ass.
sry, i'll try to slow down a bit...

[redi jedi]

http://blogs.msdn.com/shawnhar/arch...lor-julias.aspx

how much of this code needs to change to work in milkdrop?

it's only 20 lines, is it possible?

if you have a good video card... about 10.

pretty sure ps.2 has for loops, but i know 3 does got the m set right here... still working on it, I'll put it out here soon, ps3 only unfortunately as it was like 147 instructions at 10 iterations, I'm at 30i now only getting 20fps(gs7300 i think)

I'll be back..

[redi jedi]

here ya go...
ps3 only, beefy computer advised.. worth it..

[Flexi]

i'm still waiting for my new cpu and video card to check it out (case, mobo and the rest is already here)
Meanwhile there's a lot of fun with Julia sets too. - and they run smooth even on my Radeon9600/9700

Here's one with a cubic iteration.

[Flexi]

and another crazy remix

i had the chance to glance at the Mandelbrot presets. (very smooth on a 8800GT)
man, it's really time for a new computer. Amazing work, i didn't believe this was possible in so short code. *Thumbs up*

[redi jedi]

heres some remixes of your code, ps2 should run much better on your comp.

[Flexi]

seems you like it rapid

btw: i had to correct the PS version for your presets with the notepad and i had to include the texture wrap workaround - but only in the 'sweet mix' i could figure out a fractal. maybe you can post a screenshot of one of the other presets.

[bdrv]

wow that is truly beautiful! time to upgrade the PC.

[Flexi]

...the everyday fractal preset...