Question

我对openGL的体验并不是很好，所以其中一些可能看起来很草率，但我有一个项目，我使用opengl渲染一个对象使用我自己的着色器。然后，我应该能够使用鼠标和WASD键在相机周围自由漫游。我看不到对象，我的键和鼠标也没有影响对象。我一直盯着这几个小时在这里和那里改变小东西，但似乎没有什么工作我真的需要一双新眼睛看这个。我知道vmath已经老了，过剩了，但这是我们教授希望我们使用的。这些是我认为问题所在的代码。这是我的主要内容：

int main(int argc, char **argv)
{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowPosition((glutGet(GLUT_SCREEN_WIDTH) - 750) / 2, (glutGet(GLUT_SCREEN_HEIGHT) - 750) / 2);
    glutInitWindowSize(width, height);
    glutCreateWindow("Assignment Two");

    glewExperimental = GL_TRUE;
    glewInit();

    glViewport(0, 0, width, height);

    glutPassiveMotionFunc(mouseMove);
    glutKeyboardFunc(keyboard);
    glutDisplayFunc(display);
    glutIdleFunc(display);
    glEnable(GL_DEPTH_TEST);

    glGenVertexArrays(1, &VAO);
    glGenBuffers(1, &VBO);
    glBindVertexArray(VAO);

    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
    glEnableVertexAttribArray(0);
    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
    glEnableVertexAttribArray(2);

    glBindVertexArray(0);

    glutMainLoop();
    return 1;
}

这是我的显示功能，用于过剩和显示功能：

void display()
{
    Shader ourShader("Shader.vs", "Shader.frag");
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
    ourShader.Use();
    vmath::mat4 view;
    view = vmath::lookat(cPosition, cFront + cPosition, cUp);
    vmath::mat4 projection;
    projection = vmath::perspective(45.0f, (GLfloat)width / (GLfloat)height, nearC, farC);

    GLint modelLoc = glGetUniformLocation(ourShader.Program, "model");
    GLint viewLoc = glGetUniformLocation(ourShader.Program, "view");
    GLint projLoc = glGetUniformLocation(ourShader.Program, "projection");

    glUniformMatrix4fv(viewLoc, 1, GL_FALSE, view);
    glUniformMatrix4fv(projLoc, 1, GL_FALSE, projection);

    glBindVertexArray(VAO);
    for (GLuint i = 0; i < 10; i++)
    {
        vmath::mat4 model;
        model *= vmath::translate(cubePositions[i]);
        GLfloat angle = 20.0f * i;
        model *= vmath::rotate(angle, cubePositions[i]);
        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, model);

        glDrawArrays(renderType, 0, 36);
    }
    glBindVertexArray(0);

    glFlush();
    glutSwapBuffers();
}

这是在我的glutkeyboardfunc中调用的键盘：

void keyboard(unsigned char key, int xx, int yy)
{
    GLfloat cameraSpeed = 0.01f;
    int i, j;
    std::string userInput;
    if (key == 'q' || key == 'Q')
    {
        glDeleteVertexArrays(1, &VAO);
        glDeleteBuffers(1, &VBO);
        exit(0);
    }
    else if (key == 'w' || key == 'W')
    {
        cPosition += cameraSpeed * cFront;
    }
    else if (key == 's' || key == 'S')
    {
        cPosition -= cameraSpeed * cFront;
    }
    else if (key == 'a' || key == 'A')
    {
        cPosition -= vmath::normalize(vmath::cross(cFront, cUp)) * cameraSpeed;
    }
    else if (key == 'd' || key == 'D')
    {
        cPosition += vmath::normalize(vmath::cross(cFront, cUp)) * cameraSpeed;
    }
}

然后这是我的mouseMove函数，它在我的glutPassiveMotionFunc中调用：

void mouseMove(int posX, int posY)
{
    GLfloat xOffset;
    GLfloat yOffset;
    GLfloat sensitivity = 0.2f;
    if (firstTime)
    {
        lastX = (float)posX;
        lastY = (float)posY;
        firstTime = false;
    }
    xOffset = posX - lastX;
    yOffset = lastY - posY;
    lastX = (GLfloat)posX;
    lastY = (GLfloat)posY;

    xOffset *= sensitivity;
    yOffset *= sensitivity;

    yaw += xOffset;
    pitch += yOffset;

    if (pitch > 89.0f)
    {
        pitch = 89.0f;
    }
    if (pitch < -89.0f)
    {
        pitch = -89.0f;
    }

    vmath::vec3 front;
    front[0] = (GLfloat)(cos((M_PI / 180)*yaw) * cos((M_PI / 180)*pitch));
    front[1] = (GLfloat)(sin((M_PI / 180)*pitch));
    front[2] = (GLfloat)(sin((M_PI / 180)*yaw) * cos((M_PI / 180)*pitch));
    cFront = vmath::normalize(front);
}

这是我的Shader.vs：

layout (location = 0) in vec3 position;

uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;

void main()
{
    gl_Position = projection * view * model * vec4(position, 1.0f);
}

我认为某些事情没有被正确更改，或者没有正确更新这一事实。如果您希望我发布任何内容或通过我的代码让您了解其他任何内容，请与我们联系。

Answer 1

您忘记在模型周期中初始化vmath::mat4 model。

你可以这样做：

for (GLuint i = 0; i < 10; i++)
{
    vmath::mat4 model( vmath::translate(cubePositions[i]) );
    GLfloat angle = 20.0f * i;
    model *= vmath::rotate(angle, cubePositions[i]);
    glUniformMatrix4fv(modelLoc, 1, GL_FALSE, model);

    glDrawArrays(renderType, 0, 36);
}

OpenGL程序/ w着色器，相机移动不正确

1 个答案: