noiseRingCRGB()

CRGB fl::noiseRingCRGB	(	float	angle,
		u32	time,
		float	radius = 1.0f )

Generate CRGB noise for a ring pattern.

Samples three z-slices of 3D Perlin noise to create independent red, green, and blue components (direct RGB, not HSV conversion).

Parameters

angle	Position around the ring (radians, 0 to 2π)
time	Animation time parameter
radius	Noise zoom level (level of detail). Larger values = coarser pattern, smaller = more detail (default 1.0)

Returns

CRGB color with 8-bit components

Definition at line 63 of file noise.cpp.hpp.

                                                        {
  // Convert angle to cartesian coordinates
  float x = fl::cosf(angle);
  float y = fl::sinf(angle);
 
  // Map sin/cos 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);
 
  // Sample three different z-slices for R, G, B components (direct RGB)
  // Using offsets 0x0, 0x10000, 0x20000 to separate them in noise space
  u16 r16_raw = inoise16(nx, ny, time);
  u16 g16_raw = inoise16(nx, ny, time + 0x10000);
  u16 b16_raw = inoise16(nx, ny, time + 0x20000);
 
  // Rescale from observed noise range to full 0-65535 range using global extents
  u16 r16 = rescaleNoiseValue16(r16_raw);
  u16 g16 = rescaleNoiseValue16(g16_raw);
  u16 b16 = rescaleNoiseValue16(b16_raw);
 
  // Scale down to 8-bit
  u8 r = r16 >> 8;
  u8 g = g16 >> 8;
  u8 b = b16 >> 8;
 
  return CRGB(r, g, b);
}

References cosf(), inoise16(), rescaleNoiseValue16(), sinf(), time(), x, and y.

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