c++ - OpenGL 使用 Q 和 E 字符移动相机 GLFW 库

Question

我无法找出正确的命令来添加到此，并使 Q 和 E 命令直接上下移动相机。我尝试了很多事情都没有成功。

void processInput(GLFWwindow *window)
{
    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
        glfwSetWindowShouldClose(window, true);

    float cameraSpeed = 2.5 * deltaTime;
    if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
        cameraPos += cameraSpeed * cameraFront;
    if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
        cameraPos -= cameraSpeed * cameraFront;
    if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
        cameraPos -= glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
    if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
        cameraPos += glm::normalize(glm::cross(cameraFront, cameraUp)) * cameraSpeed;
}

标签： c++glfwglm-math

Answer 1

如果cameraUp垂直于cameraFront：

if (glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS)
    cameraPos -= cameraSpeed * cameraUp;
if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS)
    cameraPos += cameraSpeed * cameraUp;

如果cameraUp不（完全）垂直于cameraFront您必须计算由cross(cameraFront, cameraUp)and定义的平面上的法线向量cameraFront：

glm::vec3 lateral_vector = glm::normalize(glm::cross(cameraFront, cameraUp));
glm::vec3 up_vector = glm::normalize(glm::cross(lateral_vector, cameraFront));

if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
    cameraPos -= cameraSpeed * cameraFront;
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
    cameraPos += cameraSpeed * cameraFront;
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
    cameraPos -= cameraSpeed * lateral_vector;
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
    cameraPos += cameraSpeed * lateral_vector;
if (glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS)
    cameraPos -= cameraSpeed * up_vector;
if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS)
    cameraPos += cameraSpeed * up_vector;