Lorenz Attractor

[anakin78z]

Howdy.

Here's a small otl containing the lorenz attractor hda. I created it after reading the thread on the sesi mailing list.

Lorenz.otl.gz

[anakin78z]

Oh yeah, you may want to make your framerange closer to 10000

[concept4]

I remember that from a screensaver in linux.

--Ronnie

[Lukich]

what happens if the OTL refuses to install telling me to check permissions? I have administrative privileges, but it still wouldn't let me.

[edward]

Install into your current hip?

[deecue]

that was happening to me when i was trying to install otl's when i was in 6 and apparently everyone else was in 6.1. once i got access to the newer version, the otl's seemed to install just fine.

[Lukich]

6.1 sure worked. Thanks a lot

[anakin78z]

I set up an ifd to render these puppies. Looks like this:

ray_version VEX6.1.269

# Define some geometry named "geo".  It is smooth shaded.  It contains a single primitive sphere.
# ray_detail -s geo ./sphere.bgeo
ray_detail -s geo stdin
PGEOMETRY V5
NPoints 1 NPrims 1
NPointGroups 0 NPrimGroups 0
NPointAttrib 0 NVertexAttrib 0 NPrimAttrib 0 NAttrib 0
0 0 0 1
Sphere 0 0.2 0 0 0 -8.742278e-09 -0.2 0 0.2 -8.742278e-09
beginExtra
endExtra




#Define the camera and output image
ray_picture ip          # Set the output image name
ray_resolution 512 512  # Set the output resolution
ray_zoom 1              # Set the field of view
ray_clip .01 10000      # Set near/far clipping planes

# Now, instance the geometry 5 times.  We can use the standard
# hscript expression evaluation and variable expansion to position
# the objects.



# Light definitions
# Light /obj/light1
ray_light -n /obj/light1 -Z 1.20711 1.20711
ray_shader opdef:/Shop/v_asadlight lightcolor 0.8 0.8 0.8 doatten 1 atten 1e+06
ray_transform 0.946524 -0.319927 -0.0416889 0 0.283868 0.764407 0.578879 0 0.153332 0.559757 -0.814347 0 18.1857 80.3025 -38.1168 1
ray_smask *


set h = 0.005
set a = 10
set b = 28
set c = `8/3`

set x = 0.1
set y = 0
set z = 0
set poke = 0

# set number of spheres to render
for i = 0 to 1000
 ray_object object$i geo   # Define an instance  
 # Transform the instance, with lorenz attractor code
  set X = `$x + $h * $a * ($y - $x)`
  set Y = `$y +$h * ($x * ($b - $z) - $y)`
  set Z = `$z + $h * ($x * $y - $c * $z )`
  set x = $X
  set y = $Y
  set z = $Z
  ray_transform 1 0 0 0  0 1 0 0  0 0 1 0  `$x-1.5` `$y+1` `$z+3` 1     
  if ( `$i%100`==0)
  echo $i
  endif
  # Apply a surface shader to the instance
  ray_shader opdef:/Shop/v_plastic amb 1 1 1 diff `fit($i,0,1000,0,1)` `abs(sin($i/20))` 0 spec 1 1 1 rough 0.1 _shop_ /shop/v_plastic1
ray_lmask  0
ray_rmask *
end

# Tell mantra to render the scene
echo "Render Starting NOW"
ray_raytrace # Quit mantra
ray_quit

]

And renders like this (with a hundred thousand spheres)

[MatrixNAN]

Hey Jens,

The pending doom of the Tea Pots. lol You going to be at Siggraph this year. I hope I am. I think I am going to get to go for free but I am not sure. I got hired to a Animation Company here in Atlanta called AtlantaCAD.

Cheers,

Nate Nesler

[rdg]

Interesting solution!

Being a big fan of Lorenz Attractors myself, I tried to build this too.

It took me sometime to build an animatable version with 3dsmax and was thinking in Houdini this must be an ease.

I stumbled over recursive problems but never thought of using particles.

Is there a way to build recursive stuff with this "vop sop"?

Georg