Function noiseSphereHSV16

src/fl/gfx/noise/noise.cpp.hpp:94–119

Sphere noise functions - sample three z-slices for independent component evolution

/// Sphere noise functions - sample three z-slices for independent component evolution
HSV16 noiseSphereHSV16(float angle, float phi, u32 time, float radius) {
  // Convert spherical coordinates to cartesian
  // angle: azimuth (0 to 2π), phi: polar angle from north pole (0 to π)
  // x = sin(phi) * cos(angle)
  // y = sin(phi) * sin(angle)
  // z = cos(phi)
  float sin_phi = fl::sinf(phi);
  float cos_phi = fl::cosf(phi);
  float x = sin_phi * fl::cosf(angle);
  float y = sin_phi * fl::sinf(angle);
  float z = cos_phi;

  // Map cartesian values from [-1, 1] to [0, 0xFFFF]
  // This ensures positive values for uint32_t conversion
  u32 nx = static_cast<u32>((x + 1.0f) * 0.5f * radius * 0xffff);
  u32 ny = static_cast<u32>((y + 1.0f) * 0.5f * radius * 0xffff);
  u32 nz = static_cast<u32>((z + 1.0f) * 0.5f * radius * 0xffff);

  // Sample three different t-slices for H, S, V components
  // Using offsets 0x0, 0x10000, 0x20000 to separate them in noise space
  u16 h = inoise16(nx, ny, nz, time);
  u16 s = inoise16(nx, ny, nz, time + 0x10000);
  u16 v = inoise16(nx, ny, nz, time + 0x20000);

  return HSV16(h, s, v);
}

CHSV noiseSphereHSV8(float angle, float phi, u32 time, float radius) {
  HSV16 hsv16 = noiseSphereHSV16(angle, phi, time, radius);