crackGeom

How much crack there is at a pixel, and which way the shard under it has moved.

crackGeom(
  uv: v2f,
  nPosX: number,
  nPosY: number,
  sPosX: number,
  sPosY: number,
  dispX: number,
  dispY: number,
  crackWidth: number,
): { crackIntensity: number; edgeNormal: v2f; displacedUV: v2f; disp: v2f; }

Import effects from shaders/std and use effects.fracture.crackGeom.

Takes the pixel's uv, the nearest and second-nearest shard positions (x and y, in uv), the nearest shard's displacement (x and y, in uv) and crackWidth (about 0.5 to 5). Returns a record with crackIntensity (0 to 1, and 0 until the shard has actually moved), edgeNormal (the direction across the crack), displacedUV (where to sample the layer inside) and disp (the displacement again, for crackShardCompose).

Parameters

Example

const geom = call(crackGeom, 'crackGeom', [ctx.uv, dataAt(nearest, 0), dataAt(nearest, 1), dataAt(second, 0), dataAt(second, 1), dataAt(nearest, 2), dataAt(nearest, 3), uniforms.crackWidth])

See also

• crackRefractUV — Where to sample one color channel so the crack bends the light and splits it like a prism.
• crackShardCompose — The finished glass: the three refracted channels blended into the crack, with a hint of light on tilted shards.
• cellLaneUVFor — Where one shard's value sits in a one-row data texture.

Used by

Shatter