Equations

Settings

The following settings can be adjusted in the filter dialog:

• Coordinate System—choose from Cartesian or Polar coordinates.
• Cartesian
  • x = —enter expressions for the X-axis.
  • y = —enter expressions for the Y-axis.
• Polar
  • r = —enter expressions for the radius.
  • t = —enter expressions for the polar angle (theta).
• Parameter A (a)—controls the value of custom variable a.
• Parameter B (b)—controls the value of custom variable b.
• Parameter C (c)—controls the value of custom variable c.
• Extend Mode—chooses how to treat pixels outside of the image bounds:
  • Zero—fills pixels outside the image bounds with zeros (alpha values).
  • Full—fills pixels outside the image bounds with constant values (pure white).
  • Repeat—fills pixels outside the image bounds with repetitions of the image's edge pixels.
  • Wrap—fills pixels outside the image bounds with copies of the image; useful for positional offset filters and seamless texture authoring.
  • Mirror—fills pixels outside the image bounds with mirrored (reflected) copies of the image.