问题

Question

我要做什么

我正在尝试渲染多边形以使行星的轨道可见。

目前，我的卫星和行星正在渲染和绕太阳旋转的单个点。

问题

我的多边形无法渲染。

我没有尝试显示任何可渲染的多边形。

这是我用来计算并尝试渲染多边形的Planet类的方法：

// render this planets orbit circle
void Planet::renderOrbit(glm::vec2 currentPlanetPosition)
{
    // draw a line strip
    glBegin(GL_LINE_STRIP);

    // loop round from 0 to 2*PI and draw around the radius of the orbit using trigonometry
    for (float angle = 0.0f; angle < 6.283185307f; angle += 0.05f)
    {
        glVertex3f(sin(angle) * orbitDistance, cos(angle) * orbitDistance, 0.0f);
    }
    glVertex3f(0.0f, orbitDistance, 0.0f);

    glEnd();

    //render the moons' orbit
    glPushMatrix();
    // translate to the center of this planet to draw the moon orbit around it
    glTranslatef(currentPlanetPosition[0], currentPlanetPosition[1], 0.0f);
    // draw moon orbits
    glPopMatrix();
}

这是我用来绘制我的星球的代码。

void Planet::drawPlanet(glm::vec2 planetPosition, GLfloat UniverseSpeed) {
    shader.Use();
    //Drawing
    glm::mat4 model = glm::mat4(1.0f);
    glm::vec2 currentPlanetPosition = calculatePos(planetPosition, UniverseSpeed);
    //Relative Position
    model = glm::translate(model, glm::vec3(currentPlanetPosition.x, 0.0f,currentPlanetPosition.y));

    //Rotation
    model = glm::rotate(model, glm::radians((GLfloat)glfwGetTime() * rotationSpeed * UniverseSpeed), glm::vec3(0.0f, 1.0f, 0.0f));

    //Scaling
    model = glm::scale(model, glm::vec3(planetaryScale, planetaryScale, planetaryScale));
    glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));

    planetModel.Draw(shader);

    for (Planet moon : listOfPlanets) {
        moon.drawPlanet(currentPlanetPosition, UniverseSpeed);
        moon.renderOrbit(currentPlanetPosition);
    }
}

main.cpp

#include <string>
#include <algorithm>
#include <vector>
#include <map>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
// GLEW

#include <GL/glew.h>

// GLFW
#include <GLFW/glfw3.h>

// GL includes
#include "Shader.h"
#include "Camera.h"
#include "Model.h"
#include "Planet.h"
// GLM Mathemtics
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>

// Other Libs
#include "SOIL2/SOIL2.h"
#include <math.h>
#include <list>

// Properties
const GLuint WIDTH = 1200, HEIGHT = 900;
int SCREEN_WIDTH, SCREEN_HEIGHT;

// Function prototypes
void KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mode);
void MouseCallback(GLFWwindow* window, double xPos, double yPos);
void DoMovement();

// Camera
Camera camera(glm::vec3(0.0f, 100.0f, 0.0f));
bool keys[1024];
GLfloat lastX = 400, lastY = 300;
bool firstMouse = true;

GLfloat deltaTime = 0.0f;
GLfloat lastFrame = 0.0f;
GLfloat UniverseSpeed = 1.0f;


int main()
{
    // Init GLFW
    glfwInit();
    // Set all the required options for GLFW
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);

    // Create a GLFWwindow object that we can use for GLFW's functions
    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", nullptr, nullptr);

    if (nullptr == window)
    {
        std::cout << "Failed to create GLFW window" << std::endl;
        glfwTerminate();

        return EXIT_FAILURE;
    }

    glfwMakeContextCurrent(window);
    glfwGetFramebufferSize(window, &SCREEN_WIDTH, &SCREEN_HEIGHT);

    // Set the required callback functions
    glfwSetKeyCallback(window, KeyCallback);
    glfwSetCursorPosCallback(window, MouseCallback);

    // GLFW Options
    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);

    // Set this to true so GLEW knows to use a modern approach to retrieving function pointers and extensions
    glewExperimental = GL_TRUE;
    // Initialize GLEW to setup the OpenGL Function pointers
    if (GLEW_OK != glewInit())
    {
        std::cout << "Failed to initialize GLEW" << std::endl;
        return EXIT_FAILURE;
    }

    // Define the viewport dimensions
    glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);

    // OpenGL options
    glEnable(GL_DEPTH_TEST);

    // Setup and compile our shaders
    Shader shader("./res/shaders/modelLoading.vs", "./res/shaders/modelLoading.frag");

    // Load models
    //Model ourModel( "./res/models/nanosuit/nanosuit.obj");

    //planets
    Model earthModel("./res/models/planets/earth/earth.obj");
    Model jupiterModel("./res/models/planets/jupiter/jupiter1.obj");
    Model marsModel("./res/models/planets/mars/Mars_normal-strong.obj");
    Model mercuryModel("./res/models/planets/mercury/mercury.obj");
    Model neptuneModel("./res/models/planets/neptune/neptune.obj");
    Model saturnModel("./res/models/planets/saturn/saturn3.obj");
    Model uranusModel("./res/models/planets/uranus/uranus.obj");
    Model venusModel("./res/models/planets/venus/venus.obj");

    //sun
    Model sunModel("./res/models/planets/Sun/sun2.obj");

    //moons
    Model moonModel("./res/models/planets/moon/moon1.obj");

    //Model sunMoons[] = {earthModel, jupiterModel, marsModel,mercuryModel, moonModel, neptuneModel, saturnModel, sunModel, uranusModel, venusModel};

    //view distance 300
    glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCREEN_WIDTH / (float)SCREEN_HEIGHT, 0.1f, 300.0f);


    std::list<Planet> noMoons;
    std::list<Planet> earthMoons;
    std::list<Planet> planets;


    ////Luna
    //radius = 10.0f
    //Angle 0.005f
    Planet earthMoon = Planet(shader, moonModel, 10.0f, 0.005f, 8.0f * UniverseSpeed, 10000.0f * UniverseSpeed, 0.005f, noMoons);
    earthMoons.push_back(earthMoon);

    ////Mercury
    //radius = 70.0f
    //Angle 0.008f
    Planet mercury = Planet(shader, mercuryModel, 70.0f, 0.01f, 8.0f * UniverseSpeed, 1000.0f * UniverseSpeed, 0.008f, noMoons);
    ////Venus
    //radius = 80.0f
    //angle = 0.007f
    Planet venus =Planet(shader, venusModel, 80.0f, 0.01f, 8.0f * UniverseSpeed, 1000.0f * UniverseSpeed, 0.007f, noMoons);
    ////earth
    //radius = 90.0f
    //angle = 0.006f
    Planet earth =Planet(shader, earthModel, 90.0f, 0.01f, 8.0f * UniverseSpeed, 1000.0f * UniverseSpeed, 0.006f, earthMoons);
    ////Mars
    //radius = 100.0f
    //angle = 0.005f
    Planet mars = Planet(shader, marsModel, 100.0f, 0.01f, 8.0f * UniverseSpeed, 1000.0f * UniverseSpeed, 0.005f, earthMoons);
    //// JUPITER
    //radius = 120.0f
    //angle = 0.0045f
    Planet jupiter = Planet(shader, jupiterModel, 120.0f, 0.01f, 8.0f * UniverseSpeed, 1000.0f * UniverseSpeed, 0.0045f, earthMoons);
    ////Uranus
    //radius = 190.0f
    //angle = 0.0035f
    Planet uranus = Planet(shader, uranusModel, 190.0f, 0.01f, 8.0f * UniverseSpeed, 1000.0f * UniverseSpeed, 0.0035f, noMoons);
    ////SATURN
    //radius = 160.0f
    //angle = 0.0040f
    Planet saturn = Planet(shader, saturnModel, 160.0f, 0.01f, 8.0f * UniverseSpeed, 1000.0f * UniverseSpeed, 0.004f, noMoons);
    //radius = 220.0f
    //angle = 0.003f
    Planet neptune = Planet(shader, neptuneModel, 220.0f, 0.01f, 8.0f * UniverseSpeed, 1000.0f * UniverseSpeed, 0.003f, noMoons);

    ////Sun
    //radius = 0.0f
    //Angle 0.006f

    planets.push_back(mercury);
    planets.push_back(venus);
    planets.push_back(earth);
    planets.push_back(mars);
    planets.push_back(jupiter);
    planets.push_back(uranus);
    planets.push_back(saturn);
    planets.push_back(neptune);

    Planet sun= Planet(shader, sunModel, 0.0f, 0.01f, 16.0f* UniverseSpeed, 0.0f, 0.006f, planets);

    // Game loop
    while (!glfwWindowShouldClose(window))
    {

        // Set frame time
        GLfloat currentFrame = glfwGetTime();
        deltaTime = currentFrame - lastFrame;
        lastFrame = currentFrame;

        // Check and call events
        glfwPollEvents();
        DoMovement();


        // Clear the colorbuffer
        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        shader.Use();

        glm::mat4 view = camera.GetViewMatrix();
        glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
        glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));

        sun.drawPlanet(glm::vec2(0.0f, 0.0f), UniverseSpeed);

        // Swap the buffers
        glfwSwapBuffers(window);
    }

    glfwTerminate();
    return 0;
}




// Moves/alters the camera positions based on user input
void DoMovement()
{
    // Camera controls
    if (keys[GLFW_KEY_W] || keys[GLFW_KEY_UP]) {
        camera.ProcessKeyboard(FORWARD, deltaTime);
    }
    if (keys[GLFW_KEY_S] || keys[GLFW_KEY_DOWN]) {
        camera.ProcessKeyboard(BACKWARD, deltaTime);
    }
    if (keys[GLFW_KEY_A] || keys[GLFW_KEY_LEFT]) {
        camera.ProcessKeyboard(LEFT, deltaTime);
    }
    if (keys[GLFW_KEY_D] || keys[GLFW_KEY_RIGHT]) {
        camera.ProcessKeyboard(RIGHT, deltaTime);
    }

}

// Is called whenever a key is pressed/released via GLFW
void KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mode) {
    if (GLFW_KEY_ESCAPE == key && GLFW_PRESS == action) {
        glfwSetWindowShouldClose(window, GL_TRUE);
    }
    if (GLFW_KEY_KP_ADD== key ) {

        UniverseSpeed = UniverseSpeed * 1.25;
        std::cout << UniverseSpeed << std::endl;

    }
    else if(GLFW_KEY_KP_SUBTRACT == key){

        UniverseSpeed = UniverseSpeed / 1.25;
        std::cout << UniverseSpeed << std::endl;

    }




    if (key >= 0 && key < 1024) {
        if (action == GLFW_PRESS) {
            keys[key] = true;
        }
        else if (action == GLFW_RELEASE) {
            keys[key] = false;
        }
    }
}

void MouseCallback(GLFWwindow* window, double xPos, double yPos) {
    if (firstMouse) {
        lastX = xPos;
        lastY = yPos;
        firstMouse = false;
    }

    GLfloat xOffset = xPos - lastX;
    GLfloat yOffset = lastY - yPos;  // Reversed since y-coordinates go from bottom to left

    lastX = xPos;
    lastY = yPos;

    camera.ProcessMouseMovement(xOffset, yOffset);
}

我怀疑多边形的书写方式正确，但是由于某种原因，它最终并没有被渲染。

我在其他项目中将多边形渲染为2D图像，但是从未在3D项目中像这样的轨道上渲染2D对象。

我怀疑我对如何将两个词组合在一起缺乏了解。

多边形不渲染

我要做什么

问题

0 个答案: