GLTFMaterialsAnisotropyExtension constructor

Implementation

GLTFMaterialsAnisotropyExtension(this.parser) {
  name = gltfExtensions["KHR_MATERIALS_ANISOTROPY"]!;

  getMaterialType = (materialIndex) {
    final parser = this.parser;
    final materialDef = parser.json["materials"][materialIndex];

    if (materialDef["extensions"] == null ||
        materialDef["extensions"][name] == null) return null;

    return MeshPhysicalMaterial;
  };

  extendMaterialParams = (int materialIndex, Map<String, dynamic> materialParams) async {
    final parser = this.parser;
    final materialDef = parser.json["materials"][materialIndex];

    if (materialDef["extensions"] == null ||
        materialDef["extensions"][name] == null) {
      return null;
    }

    List<Future<Texture?>> pending = [];

    final extension = materialDef["extensions"][name];

    materialParams['anisotropyStrength'] = (extension['anisotropyStrength'] as num?)?.toDouble() ?? 1.0;

    if (extension['anisotropyRotation'] != null) {
      materialParams['anisotropyRotation'] = (extension['anisotropyRotation'] as num?)?.toDouble();
    }

    final colorArray = extension['specularColorFactor'] ?? [1, 1, 1];
    materialParams['specularColor'] =
        Color(colorArray[0], colorArray[1], colorArray[2]);

    if (extension['anisotropyTexture'] != null) {
      final texture = parser.assignTexture(materialParams, 'anisotropyMap', extension['anisotropyTexture'], LinearSRGBColorSpace);
      pending.add(texture);
    }

    return await Future.wait(pending);
  };
}