计算机图形学练习（二）—

正方体绕轴旋转

只要在旋转立方体的代码上做稍微的改动即可
旋转立方体
本文将立方体立起来旋转，关键在于初始偏转角度的计算

transform = glm::rotate(transform, glm::radians(45.0f) * static_cast<GLfloat>(glfwGetTime()), glm::vec3(0.0f, 1.0f, 0.0f));
transform = glm::rotate(transform, (glm::f32)acos(1 / sqrt(3)), glm::vec3(1.0f, 0.0f, 1.0f));

** main.cpp**

#include <iostream>
#define GLEW_STATIC
#include"Shader.h"#include<GL/glew.h>#include<GLFW/glfw3.h>#include<glm/glm.hpp>
#include<glm/gtc/matrix_transform.hpp>
#include<glm/gtc/type_ptr.hpp>int main()
{glfwInit();glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);int WIDTH = 800, HEIGHT = 600;GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT,"Learn OpenGL ", nullptr, nullptr);int screenWidth, screenHeight;glfwGetFramebufferSize(window, &screenWidth, &screenHeight);if (window == nullptr) {std::cout << "Failed to creat GLFW window" << std::endl;glfwTerminate();return -1;}glfwMakeContextCurrent(window);glewExperimental = GL_TRUE;if (glewInit() != GLEW_OK) {std::cout << "Failed to initialize GLEW" << std::endl;glfwTerminate();return -1;}glEnable(GL_DEPTH_TEST);glDepthFunc(GL_LESS);Shader shader = Shader("res/shaders/code.vs", "res/shaders/code.fs");GLfloat vertices[] = {-0.5f,-0.5f,-0.5f,      1.0f,0.0f,0.0f,0.5f,-0.5f,-0.5f,       1.0f,0.0f,0.0f,0.5f,0.5f,-0.5f,        1.0f,0.0f,0.0f,0.5f,0.5f,-0.5f,        1.0f,0.0f,0.0f,-0.5f,0.5f,-0.5f,       1.0f,0.0f,0.0f,-0.5f,-0.5f,-0.5f,      1.0f,0.0f,0.0f,-0.5f,-0.5f,0.5f,      0.0f,1.0f,0.0f,0.5f,-0.5f,0.5f,       0.0f,1.0f,0.0f,0.5f,0.5f,0.5f,        0.0f,1.0f,0.0f,0.5f,0.5f,0.5f,        0.0f,1.0f,0.0f,-0.5f,0.5f,0.5f,       0.0f,1.0f,0.0f,-0.5f,-0.5f,0.5f,      0.0f,1.0f,0.0f,-0.5f,0.5f,0.5f,        0.0f,0.0f,1.0f,-0.5f,0.5f,-0.5f,       0.0f,0.0f,1.0f,-0.5f,-0.5f,-0.5f,      0.0f,0.0f,1.0f,-0.5f,-0.5f,-0.5f,      0.0f,0.0f,1.0f,-0.5f,-0.5f,0.5f,       0.0f,0.0f,1.0f,-0.5f,0.5f,0.5f,        0.0f,0.0f,1.0f,0.5f,0.5f,0.5f,         0.0f,1.0f,1.0f,0.5f,0.5f,-0.5f,        0.0f,1.0f,1.0f,0.5f,-0.5f,-0.5f,       0.0f,1.0f,1.0f,0.5f,-0.5f,-0.5f,       0.0f,1.0f,1.0f,0.5f,-0.5f,0.5f,        0.0f,1.0f,1.0f,0.5f,0.5f,0.5f,         0.0f,1.0f,1.0f,-0.5f,-0.5f,-0.5f,      1.0f,0.0f,1.0f,0.5f,-0.5f,-0.5f,       1.0f,0.0f,1.0f,0.5f,-0.5f,0.5f,        1.0f,0.0f,1.0f,0.5f,-0.5f,0.5f,        1.0f,0.0f,1.0f,-0.5f,-0.5f,0.5f,       1.0f,0.0f,1.0f,-0.5f,-0.5f,-0.5f,      1.0f,0.0f,1.0f,-0.5f,0.5f,-0.5f,       1.0f,1.0f,0.0f,0.5f,0.5f,-0.5f,        1.0f,1.0f,0.0f,0.5f,0.5f,0.5f,         1.0f,1.0f,0.0f,0.5f,0.5f,0.5f,         1.0f,1.0f,0.0f,-0.5f,0.5f,0.5f,        1.0f,1.0f,0.0f,-0.5f,0.5f,-0.5f,       1.0f,1.0f,0.0f,};GLuint VAO, VBO;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, 6 * sizeof(GLfloat), (GLvoid*)0);glEnableVertexAttribArray(0);glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));glEnableVertexAttribArray(1);glBindBuffer(GL_ARRAY_BUFFER, 0);glBindVertexArray(0);while (!glfwWindowShouldClose(window)) {glViewport(0, 0, screenWidth, screenHeight);glfwPollEvents();glClearColor(0.2f, 0.3f, 0.3f, 1.0f);glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);shader.Use();glm::mat4 transform = glm::mat4(1.0f);transform = glm::rotate(transform, glm::radians(45.0f) * static_cast<GLfloat>(glfwGetTime()), glm::vec3(0.0f, 1.0f, 0.0f));transform = glm::rotate(transform, (glm::f32)acos(1 / sqrt(3)), glm::vec3(1.0f, 0.0f, 1.0f));transform = glm::scale(transform, glm::vec3(0.5f, 0.5f, 0.5f));GLuint transLoc = glGetUniformLocation(shader.Program, "transform");//找到transform的位置glUniformMatrix4fv(transLoc, 1, GL_FALSE, glm::value_ptr(transform));//只传一个矩阵，所以变量是1glBindVertexArray(VAO);glDrawArrays(GL_TRIANGLES, 0, 36);glBindVertexArray(0);glfwSwapBuffers(window);}glDeleteVertexArrays(1, &VAO);glDeleteBuffers(1, &VBO);glfwTerminate();return 0;
}

运行结果

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计算机图形学练习（二）——正方体绕轴旋转

正方体绕轴旋转

运行结果

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