Function createPreviewMaterial

js/previewMaterial.js:413–421

(displacementTexture, settings)

    // Blend: 100% mask colour at the boundary, fading to 0% at falloff distance
    vec3 color = mix(litTeal, litMask, maskEffect);

    gl_FragColor = vec4(color, 1.0);
  }
`;

// ── Public API ────────────────────────────────────────────────────────────────

/**
 * Create a ShaderMaterial for the displacement preview.
 * @param {THREE.Texture|null} displacementTexture
 * @param {object} settings  – { mappingMode, scaleU, scaleV, amplitude, offsetU, offsetV, bounds }
 */