Ring

ライブエディター

function Canvas() {
      const geo = ring({ innerRadius: 0.5, outerRadius: 1, thetaSegments: 32, phiSegments: 4 })
      const mat = rotate3dX(iMouse.y.negate()).mul(rotate3dY(iMouse.x))
      const gl = useGL({
              isWebGL: true,
              isDepth: true,
              count: geo.count,
              vertex: vec4(mat.mul(geo.vertex), 1),
              fragment: vec4(varying(geo.normal), 1),
      })
      return <canvas ref={gl.ref} />
}

結果

Loading...

Ring Props

innerRadius	The inner radius of the ring. Default is 0.5.
outerRadius	The outer radius of the ring. Default is 1.
thetaSegments	Number of angular segments. Higher values create smoother curves. Minimum is 3. Default is 32.
phiSegments	Number of radial segments. Controls radial subdivision density. Minimum is 1. Default is 1.
thetaStart	Starting angle in radians. Default is 0.
thetaLength	Angular sweep in radians. Default is Math.PI*2.

Mathematical Foundation

Ring geometry generates vertices in polar coordinate space following the parametric equations:

$$x = r \cos(\theta)$$ $$y = r \sin(\theta)$$

where $r$ varies linearly from inner radius $r_{inner}$ to outer radius $r_{outer}$ across $\phi$ segments:

$$r(\phi) = r_{inner} + \frac{\phi}{n_{\phi}} \cdot (r_{outer} - r_{inner})$$

The angular parameter $\theta$ spans from $\theta_{start}$ to $\theta_{start} + \theta_{length}$ across $n_{\theta}$ segments:

$$\theta(i) = \theta_{start} + \frac{i}{n_{\theta}} \cdot \theta_{length}$$

Radial Distribution Analysis

Ring geometry establishes uniform radial distribution through linear interpolation. Each vertex position is determined by the intersection of radial lines and concentric circles. The vertex count formula:

$$V = (n_{\theta} + 1) \times (n_{\phi} + 1)$$

where $n_{\theta}$ and $n_{\phi}$ represent angular and radial segment counts respectively.

Geometric Properties

Ring structures exhibit rotational symmetry about the z-axis. All vertices lie in the xy-plane with z-coordinate fixed at zero. Normal vectors remain constant as $\vec{n} = (0, 0, 1)$ for all vertices, indicating planar geometry.

The area enclosed between concentric boundaries follows:

$$A = \pi(r_{outer}^2 - r_{inner}^2)$$

This area distribution enables mathematical pattern visualization through vertex density manipulation.

Practical Implementation

Ring geometry serves mathematical visualization where polar coordinate relationships require explicit representation. The parametric control over radial and angular subdivision enables precise pattern generation for mathematical demonstrations.

Segment parameters directly control mesh resolution. Angular segments determine circumferential smoothness, while radial segments control the density of concentric patterns.