我希望控制相机，使其可以围绕模型旋转。
理论代码应为：

// `camera_rotation_angle_x_` and `camera_rotation_angle_y_` are initialized to 0, and can be modified by the user.

glm::mat4 CreateViewMatrix(glm::vec3 eye_pos, glm::vec3 scene_center, glm::vec3 up_vec) {
  auto eye_transform = glm::translate(glm::mat4(1.0f), -scene_center); // recenter
  eye_transform = glm::rotate(eye_transform, camera_rotation_angle_x_, glm::vec3(1.0f, 0.0f, 0.0f));
  eye_transform = glm::rotate(eye_transform, camera_rotation_angle_y_, glm::vec3(0.0f, 1.0f, 0.0f));
  eye_transform = glm::translate(eye_transform, scene_center); // move back
  eye_pos = eye_transform * glm::vec4(eye_pos, 1.0f);
  up_vec = eye_transform * glm::vec4(up_vec, 0.0f);
  return glm::lookAt(eye_pos, scene_center, up_vec);
}

但是“重新居中”和“移回”这两行必须写为如下才能正确旋转，否则当旋转参数改变时，从相机到中心的距离会发生变化：

auto eye_transform = glm::translate(glm::mat4(1.0f), scene_center); // recenter *The sign has changed*
...
eye_transform = glm::translate(eye_transform, -scene_center); // move back *The sign has changed*
...
// Correctness test, only when the distance remains constant, the rotation logic is correct.
cout << "eye_pos: " << eye_pos[0] << ", " << eye_pos[1] << ", " << eye_pos[2] << endl;
cout << "distance: " << (sqrt(
    pow(eye_pos[0] - scene_center[0], 2)
        + pow(eye_pos[1] - scene_center[1], 2)
        + pow(eye_pos[2] - scene_center[2], 2)
)) << endl;

先减去中心值再加回来才是正确的逻辑，先加后减没有任何意义。
那么，到底是什么原因导致我必须编写带有逻辑错误的代码才能使其正常工作呢？
调用方的代码如下，可能bug就在这里？

// `kEyePos`, `kSceneCenter`, `kUpVec`, `kFovY`, `kAspect`, `kDistanceEyeToBack` and `kLightPos` are constants throughout the lifetime of the program

UniformBufferObject ubo{};
ubo.model = glm::mat4(1.0f);
ubo.view = CreateViewMatrix(kEyePos, kSceneCenter, kUpVec);
ubo.proj = glm::perspective(kFovY, kAspect, 0.1f, kDistanceEyeToBack);
// GLM was originally designed for OpenGL, where the Y coordinate of the clip coordinates is inverted.
// The easiest way to compensate for that is to flip the sign on the scaling factor of the Y axis in the projection matrix.
// Because of the Y-flip we did in the projection matrix, the vertices are now being drawn in counter-clockwise order instead of clockwise order.
// This causes backface culling to kick in and prevents any geometry from being drawn.
// You should modify the frontFace in `VkPipelineRasterizationStateCreateInfo` to `VK_FRONT_FACE_COUNTER_CLOCKWISE` to correct this.
ubo.proj[1][1] *= -1;
ubo.light_pos = glm::vec4(kLightPos, 1.0f); // The w component of point is 1

memcpy(vk_buffer_->GetUniformBufferMapped(frame_index), &ubo, sizeof(ubo));