上次的问题还没有解决😭。当设置 Model 偏移量很小的时候translation(0,0.1,0) 渲染出来存在黑色块。
byh_y+

// 使用 BVH 求交
optional<Intersection> BVH::intersect(const Ray& ray, [[maybe_unused]] const GL::Mesh& mesh,
                                      const Eigen::Matrix4f obj_model)
{
    model = obj_model;
    optional<Intersection> isect;
    if (!root) {
        isect = std::nullopt;
        return isect;
    }
    Ray trans_ray;
    Eigen::Matrix4f model_inv = this->model.inverse();
    trans_ray.direction =
        (model_inv * Vector4f(ray.direction.x(), ray.direction.y(), ray.direction.z(), 1.0f))
            .head<3>().normalized();
    trans_ray.origin =
        (model_inv * Vector4f(ray.origin.x(), ray.origin.y(), ray.origin.z(), 1.0f)).head<3>();
    isect = ray_node_intersect(root, trans_ray);
    if (isect.has_value()) {
        Vector3f world_intersection =
            (model * (isect->t * trans_ray.direction + trans_ray.origin).homogeneous()).head<3>();
        float dis     = (world_intersection - ray.origin).norm();
        isect->t      = dis;
        isect->normal = (model_inv.transpose() *
                         Vector4f(isect->normal.x(), isect->normal.y(), isect->normal.z(), 1.0f))
                            .head<3>();
    }
    return isect;
}

是if (isect.has_value()) 中对返回值的坐标变换存在问题吗，还是在 ray_node_intersect() 函数进行一些特殊处理？

瓦利瓦利哇

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