fogDistance function

double fogDistance(ShaderBindings b, double x, double y, double z,)

FogDistance of contributor_eye.glsl: the air between a point and the eye — the distance to it, or the depth from its plane through an orthographic lens.

Implementation

double fogDistance(ShaderBindings b, double x, double y, double z) {
  final eye = b.vec4('FogInfo', 'eye', Vector4.zero());
  final dx = x - eye.x;
  final dy = y - eye.y;
  final dz = z - eye.z;
  if (!orthographic(b)) return math.sqrt(dx * dx + dy * dy + dz * dz);
  final forward = b.vec4('FogInfo', 'forward', Vector4.zero());
  return math.max(dx * forward.x + dy * forward.y + dz * forward.z, 0.0);
}