除了硬件问题，渲染写法的一些细节上也会影响速度，例如我在BVHAccel::getIntersection里把dirIsNeg = {int(ray.direction.x > 0), int(ray.direction.y > 0), int(ray.direction.z > 0)}换成dirIsNeg = {int(ray.direction.x > 0), int(ray.direction.y > 0), 0}，bunny的渲染速度直接快了一倍
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