blendVividLight: Extreme Contrast Illumination

Dramatic Light and Shadow Dynamics

Vivid Light blending creates extreme contrast through conditional brightness manipulation. This function combines color burn for dark regions and color dodge for light regions, generating dramatic illumination effects that amplify both shadows and highlights.

The mathematical definition uses a threshold-based approach:

$$C_{result} = \begin{cases} \text{colorBurn}(C_{base}, 2 \cdot C_{blend}) & \text{if } C_{blend} < 0.5 \\ \text{colorDodge}(C_{base}, 2 \cdot (C_{blend} - 0.5)) & \text{if } C_{blend} \geq 0.5 \end{cases}$$

This dual-mode operation creates powerful contrast effects where midtones become decision points between burning shadows and dodging highlights.

Threshold-Based Contrast Properties

Property	Description	Mathematical Expression
Burn Threshold	Dark values undergo color burn intensification	$C_{blend} < 0.5 \rightarrow \text{burn}$
Dodge Threshold	Light values undergo color dodge enhancement	$C_{blend} \geq 0.5 \rightarrow \text{dodge}$
Dual Scaling	Both modes use 2x scaling for dramatic effect	$\text{scale} = 2 \cdot C_{blend}$
Extreme Response	Creates maximum contrast between light and dark	$\Delta C_{max}$

ライブエディター

const fragment = () => {
      const center = vec2(0.5)
      const radius = uv.sub(center).length()
      const basePattern = radius.mul(12).cos().mul(0.3).add(0.5)
      const blendGradient = radius.mul(1.5)
      const baseColor = vec3(0.8, 0.4, 0.2)
      const blendColor = vec3(blendGradient)
      const result = blendVividLightVec3(baseColor.mul(basePattern), blendColor)
      return vec4(result, 1)
}