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class OrenNayarBSDF : public BSDF {
public:
  OrenNayarBSDF(const Vector3f &_normal, const Vector3f &_tangent,
                const Vector3f &_bitangent, Spectrum _albedo, float sigma)
      : BSDF(_normal, _tangent, _bitangent), albedo(_albedo) {}

class OrenNayarBSDF : public BSDF {
public:
  OrenNayarBSDF(const Vector3f &_normal, const Vector3f &_tangent,
                const Vector3f &_bitangent, Spectrum _albedo, float _sigma)
      : BSDF(_normal, _tangent, _bitangent), albedo(_albedo), sigma(_sigma) {}

//* 构建八叉树
std::vector<int> primIdxBuffer(shapes.size());
std::iota(primIdxBuffer.begin(), primIdxBuffer.end(), 0);
root = recursiveBuild(boundingBox, primIdxBuffer);

Octree::OctreeNode* Octree::recursiveBuild(const AABB& aabb,
	const std::vector<int>& primIdxBuffer)