spiralZoom

Keywords:

• log
• polar
• spiral

definition_in

Twist Field

Phase Field

filter

spiralZoom

RayTK

v0.42

Transforms space using a logarithmic spiral.

See this article for a good description of the concept: https://isohedral.ca/escher-like-spiral-tilings/

In a sense, this has some similar properties to modulo2D in that it takes a slice of space and repeats it. But instead of repeating it linearly along the x and y axes, it does so with polar coordinates (angle and distance).

Important note: if the input pattern / shape does not tile correctly for the slice that’s used, you will get a discontinuity (break in space). This is similar to how you shapes can get cut off when using modulo1D / etc.

When using 2D coordinates, the Axis is ignored, and the first axis is always X and the second is always Y.

Parameters

Name	Description	Regular Handling	Read-Only Handling
Enable
Axis	The axis around which to spiral. The position on this axis will stay the same. The position on the other two axes will be wrapped around this axis.	Runtime	Semi-Baked
X: Spiral the Y and Z axes around the X axis. First axis: Y, second: Z, around: X. Y: Spiral the Z and X axes around the Y axis. First axis: Z, second: X, around: Y. Z: Spiral the X and Y axes around the Z axis. First axis: X, second: Y, around: Z.
Center	The center position along the two spiralled axes. Note that the parts of this will control different axes on the selected Axis.	Runtime	Baked
Twist 1	The amount of twisting to apply to the first axis.	Runtime	Baked
Twist 2	The amount of twisting to apply to the second axis.	Runtime	Baked
Phase	Shifts coordinates along the first and second axes, which has the effect of “spinning” different parts of the pattern.	Runtime	Baked
Branches	How many “arms” or “branches” of the spiral there should be. This is controls how many times the first axis repeats as it goes around the axis. Note that if this is not a whole integer, there will be a break in the spiral.	Runtime	Baked

Inputs

• definition_in: (required)
  • Coordinate Types: vec2 vec3
  • Context Types: Context MaterialContext CameraContext LightContext RayContext ParticleContext VertexContext PixelContext
  • Return Types: float vec4 Sdf Volume Ray Light Particle
• Twist Field: (optional)
  • Coordinate Types: vec2 vec3
  • Context Types: Context MaterialContext CameraContext LightContext RayContext ParticleContext VertexContext PixelContext
  • Return Types: vec4
  • Supports Variables: logdist
• Phase Field: (optional)
  • Coordinate Types: vec2 vec3
  • Context Types: Context MaterialContext CameraContext LightContext RayContext ParticleContext VertexContext PixelContext
  • Return Types: vec4
  • Supports Variables: logdist
  • Supports Variables From Inputs: twistField

Variables

• Log Distance:
• Distance: