如何在相机类中添加滚动

Question

我正在构建一个相机课程，并从构建该课程的在线教程中获得了帮助。

现在我想在相机中添加滚动条，但找不到任何阅读材料来解释如何在相机中添加滚动条。

Camera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 500.0f), glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f), float yaw = YAW, float pitch = PITCH) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), Zoom(ZOOM)
    {
        Position = position;
        WorldUp = up;
        Yaw = yaw;
        Pitch = pitch;
        updateCameraVectors();
    }

glm::mat4 GetViewMatrix()
    {
        return glm::lookAt(Position, Position + Front , Up);
    }

void updateCameraVectors()
    {
        
        glm::vec3 front;
        front.x = cos(glm::radians(Yaw - 90)) * cos(glm::radians(Pitch));
        front.y = sin(glm::radians(Pitch));
        front.z = sin(glm::radians(Yaw - 90)) * cos(glm::radians(Pitch)) ;
        Front = glm::normalize(front);
        Right = glm::normalize(glm::cross(Front, WorldUp));
        Up = glm::normalize(glm::cross(Right, Front));
    }

如果有人能解释如何在本课程中添加 ROll 或指导我阅读一些阅读材料，我将不胜感激。

Answer 1

要滚动视图，您需要Up围绕视线 ( ) 旋转向上矢量 ( Front)。

Front围绕定义旋转矩阵Roll：

glm::mat4 roll_mat = glm::rotate(glm::mat4(1.0f), glm::radians(Roll), Front);

Up通过矩阵变换向量：

Up = glm::mat3(roll_mat) * Up;