OpenGL

Quad World

• Cover Screen with 2 facing triangles (quad)
• Access coordinates with gl_FragCoord attribute

Sphere Tracing

• Geometry defined implicitely
• No vertex data
• Allows blending/distorion operations at computationally cheap price

Space Remapping

Copy demo from here, go to GLSL Sandbox and paste.

If runs slow use 4 or 8 samples instead of 2.

Mercury.sexy's SDF GLSL library

hg_sdf

Blending Operation

Copy demo from here, go to GLSL Sandbox and paste.

If runs slow use 4 or 8 samples instead of 2.

Noise

Copy demo from here, go to GLSL Sandbox and paste.

If runs slow use 4 or 8 samples instead of 2.

WebGL Live Coding

• ShaderToy shadertoy.com
• GLSL Sandbox glslsandbox.com
• The Force shawnlawson.github.io/The_Force

Fractals

How to fold julia fractal

acko.net/blog/how-to-fold-a-julia-fractal

Z = Z² + c

• Z(n+1) = Z(n)² + c
• Complex: Real + Imaginary (√-1)
• Using screen space coordinates as complex numbers (x real + y imaginary).

Data Flow

Wrapping up all our elements

Twitter Fractals

Experiment #1

• Raspberry Pi Sense Hat
• TCP Web Socket
• Twitter Streaming API (twitter4j)
• Syphon support
• database.json
• MIDI

Raspberry Pi

Let's play!