VDMX & Quartz Composer

Controls:

Rate Select:
Rate of tunnel movement, based on Measure Position.

Curve Controls:
Rate and amount of bends in tunnel

Tile Controls:
Controls for mirroring, and tiling the input image.

Live/Capture:
This is an important one.
Live Input
uses the realtime input (as you'd expect). The only problem with this is that movement in the image can conflict with the movement of the tunnel effect, making it look jerky, so I've added
Captured Input:
Grabs a still-frame at regular intervals (set by the rate control), and uses this as the texture. The downside is that you won't see changes to the tile controls until the next cycle.

Color Controls:
Obvious, really.

See http://machinesdontcare.wordpress.com/2008/10/26/tb-tunnel/ for more info.

Based on desaxismundi's excellent HLSL shader for VVVV.
I've translated the code to GLSL, and setup controls in QC.
No proper lighting has been implemented here, so it should run pretty well on most GPUs.
Lots of controls.
Note:
Not all the tweakable controls labelled A-D work for all surfaces. The letters in brackets next to the name indicate which controls are active for a particular surface.
Leopard-only, I'm afraid.

Controls:

Size (X)
Tile size X

Size (Y)
Tile size Y

Mix (X)
Amount of effect on X-axis.
Values greater than 0.5 invert each tile horizontally

Mix (Y)
Amount of effect on Y-axis.
Values greater than 0.5 invert each tile vertically

Mode
In Manual mode, effect amount set by Mix (X) and (Y) controls
In Auto mode, tiles are zoomed by luminosity of centre pixel in each tile, and Mix (X) and (Y) controls set depth of auto-zoom effect.

Controls:

Cell Width
Scale of effect on x-axis

Cell Height
Scale of effect on y-axis

Threshold
Amount of glitching

Randomise
Mix between tiles being shifted by brightness or random values

Random Hold
Hold random values (does nothing if Randomise is 0)

Mix
Mixes between original position of each pixel and their glitched position.

Controls
Size
size of uneffected area
Flip
Flips effect so that 'light rays' go in to centre, rather than out from it
Part of a series of emulations of Photobooth effects adapted from code in Libero Spagnolina's tutorial at http://dem.ocracy.org/libero/photobooth/
I may integrate this into thresholdStretch at some point in the future.

Adapted from the qPatchLib 0.2 macro library created by qarl and posted at the Quartzcompositions.com forum.
http://www.qarl.com/menu/qPatches/

Stretches pixels at Edge 1 towards Edge 1. Stretches pixels at Edge 2 towards Edge 1. Blends the results across the distance between Edge 1 and Edge 2.
Vertical and Horizontal modes.

Adapted from the qPatchLib 0.2 macro library created by qarl and posted at the Quartzcompositions.com forum.
http://www.qarl.com/menu/qPatches/
Quite processor-heavy, so may not work particularly well on older or slower machines.

Controls
Width
Width of pixel block
Height
Height of pixel block

Controls:
Angle
Angle of effect
Axis
Vertical or Horizontal variations
Centre Adjust
Adjust position of effect centre-line
Feedback
Level of feedback. Lower levels cause effect to fade out as it moves further from centre-line
Flip
Flips effect up/down left/right around centre-line
Freeze Input
Creates freeze-frame of input.
Rate
Rate of travel of effect.
Scan
'Scans' image up/down left/right behind slit.

Settable threshold values for Red Green and Blue channels. Pixels in each channel with brightness above the threshold value are set to full brightness, while those whose brightness falls below the threshold are set to black.
Controls
Mode
Mode 1 maximizes colour channels above threshold level
Mode 2 maximizes colour channels above threshold level and cut them below
Threshold Red
Threshold for Red channel
Threshold Green
and for Green channel
Threshold Blue
..and finally for the blue
Invert
inverts the effect for a negative version

Controls
Axis
Horizontal or vertical operation
Flip
Flips effect around selected axis
Position
Left/Right, Up/Down threshold position
Mode
Standard (0) mode shows image and stretched pixels.
Infinite (1) mode simply stretches pixels at threshold line across the entire width/height of the screen

Controls:
A(X)
Point A X-position
A(Y)
Point A Y-position
B(X)
Point B X-position
B(Y)
Point B Y-position
Flip
flips effect around line from A to B

Controls
Cell Size:
Size of pixellation cells.
Zoom Tile:
Zooms each 'meta-image' tile for added fun.
Mode:
Switches between 2 modes.
In Mode 1, the meta images have their colour multiplied with the average colour of the pixel-block (or cell).
In Mode 2, the average colour and the colour of the meta image are mixed.
Mix:
Sets mix-level between meta image and flat colour.
Only works when effect is in Mode 2

Tiger version should also work in Leopard (but the layout of the patches is a bit messy).

Controls:
Copies
Number of copies of image
Rotate X
Orbit camera on X-axis
Rotate Y
Orbit camera on Y-axis
Rotate Z
Orbit camera on Z-axis
Zoom
Zoom camera in and out
Spread
Spacing of image copies
Inertia
Smooths action of Rotate, Zoom and Spread controls for more fluid movement.
Opacity
Opacity of copies
Blending Mode
Blend-mode of copies.
Smooth Edges
Fades edges of image copies, creating smoothing effect

Controls
Scale
Scale of noise
Colour / Mono
Colour or monochrome

Controls
Angle
Angle of transition
Softness
Softness of edge
Direction
Reverses direction of wipe

Controls
Cell Width
Width of pixellation cells
Cell Height
Height of cells
Blur Horizontal
Horizontal blurring effect
Blur Vertical
Vertical blurring effect.

Simple shading, Lots of controls.

Based on OpenGL/C code by Paul Bourke, from this page:
http://ozviz.wasp.uwa.edu.au/~pbourke/surfaces_curves/sphericalh/

Thanks to Memo for GLSL code help and encouragement.

Leopard only. Sorry 10.4 users...

GLSL sourcecode here:
http://machinesdontcare.wordpress.com/2008/03/18/spherical-harmonics-gls...