将相机调整为顶视图

Question

[试图将视矩阵调整为顶视图。无法使相机向下旋转而不是直视]

else if (keyboard_key == GLFW_KEY_2 && keyaction == GLFW_PRESS) {
        // set camera's view matrix
        planet_camera.setViewMatrix(glm::vec3(0.0f,20.0f,0.0f), glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(-5.0f,-0.0f, 0.0f));
        render_scene();
    }

void Camera::setViewMatrix(glm::vec3 position, glm::vec3 lookAt, glm::vec3 up)
    {
        mPosition = position;
        mLookAt = lookAt;
        mUp = up;

        mViewMatrix = glm::lookAt(mPosition, mLookAt, mUp);
    }

Answer 1

更改位置后，是否确定要以统一的形式发送视图矩阵？另外，我认为您的上向量错误。试试：

glm::vec3(0.0f, 1.0f, 0.0f)

up-vector是全局“ up”