opengl模型加载

环境配置以及视角修改和着色器亮度修改

首先注意我的文件生成目录为bin目录所以要用到的dll文件必须放到bin目录文件夹下面，而不是debug下面

调整视角位置更高一点

public:Camera() {fov = 45;Position = glm::vec3(0.0f, 7.0f, 20.0f);UP = glm::vec3(0.0f, 1.0f, 0.0f);Front = glm::vec3(0.0f, 0.0f, -1.0f);    //移动的距离在旋转和wasd移动时都要用到,注意这里用的是-1}

调整的亮一点，取消光源衰减

 result = (light.ambient*material.ambient+diffuse*light.diffuse*material.diffuse+specular*light.specular*material.specular)*lightColor;

而不是

 result = (light.ambient*material.ambient+diffuse*light.diffuse*material.diffuse+specular*light.specular*material.specular)*lightColor*attenuation;

model函数

注意构造函数里边的参数应该是：Model(const char* path)，因为你输入的是一个不变的量
model函数实际上构建了一个又一个的mesh，所以在输出的时候是用的还是mesh.Draw
注意mesh向量数组的构建
本身就有处理obj的纹理的能力

#pragma once
#ifndef MODEL_H
#define MODEL_H#include <glad/glad.h> #include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include "stb_image.h"
#include <assimp/Importer.hpp>
#include <assimp/scene.h>
#include <assimp/postprocess.h>#include "mesh.h"
#include "Shader.h"#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
#include <map>
#include <vector>
using namespace std;
class Model
{public:/*  函数   */Model(const char* path){loadModel(path);  //调用模型路径加载函数}//渲染函数void Draw(Shader shader){for (unsigned int i = 0; i < meshes.size(); i++)meshes[i].Draw(shader);   //调用mesh的draw函数 }
private:/*  模型数据  */vector<Mesh> meshes;string directory;/*  加载模型函数   */void loadModel(string path){// 读取文件 via ASSIMPAssimp::Importer importer;const aiScene* scene = importer.ReadFile(path, aiProcess_Triangulate | aiProcess_FlipUVs);   //用三角形|翻转Y轴|还有一个切线空间暂时用不到// check for errorsif (!scene || scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE || !scene->mRootNode) // if is Not Zero{cout << "ERROR::ASSIMP:: " << importer.GetErrorString() << endl;return;}// retrieve the directory path of the filepathdirectory = path.substr(0, path.find_last_of('/'));// process ASSIMP's root node recursivelyprocessNode(scene->mRootNode, scene);    //通过路径寻找并且赋值}//递归去获取这些网格索引，获取每个网格，处理每个网格，接着对每个节点的子节点重复这一过程。//结构都放进meshes里边void processNode(aiNode* node, const aiScene* scene){// 处理节点所有的网格（如果有的话）for (unsigned int i = 0; i < node->mNumMeshes; i++){aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];meshes.push_back(processMesh(mesh, scene));    //函数将一个新的元素加到vector的最后面，位置为当前最后一个元素的下一个元素}// 接下来对它的子节点重复这一过程for (unsigned int i = 0; i < node->mNumChildren; i++){processNode(node->mChildren[i], scene);}}//将构造mesh函数放到model类里边Mesh processMesh(aiMesh* mesh, const aiScene* scene){vector<Vertex> vertices;vector<unsigned int> indices;vector<Texture> textures;for (unsigned int i = 0; i < mesh->mNumVertices; i++){Vertex vertex;// 处理顶点位置、法线和纹理坐标glm::vec3 vector; // we declare a placeholder vector since assimp uses its own vector class that doesn't directly convert to glm's vec3 class so we transfer the data to this placeholder glm::vec3 first.// positionsvector.x = mesh->mVertices[i].x;vector.y = mesh->mVertices[i].y;vector.z = mesh->mVertices[i].z;vertex.Position = vector;// normalsvector.x = mesh->mNormals[i].x;vector.y = mesh->mNormals[i].y;vector.z = mesh->mNormals[i].z;vertex.Normal = vector;// texture coordinatesif (mesh->mTextureCoords[0]) // does the mesh contain texture coordinates?{glm::vec2 vec;// a vertex can contain up to 8 different texture coordinates. We thus make the assumption that we won't // use models where a vertex can have multiple texture coordinates so we always take the first set (0).vec.x = mesh->mTextureCoords[0][i].x;vec.y = mesh->mTextureCoords[0][i].y;vertex.TexCoords = vec;}elsevertex.TexCoords = glm::vec2(0.0f, 0.0f); //没有纹理的情况vertices.push_back(vertex);}// 处理索引for (unsigned int i = 0; i < mesh->mNumFaces; i++){aiFace face = mesh->mFaces[i];// retrieve all indices of the face and store them in the indices vectorfor (unsigned int j = 0; j < face.mNumIndices; j++)indices.push_back(face.mIndices[j]);}//处理材质//把所有的材质按照类型分类放到向量里边if (mesh->mMaterialIndex >= 0){//注意这里是给材质对象赋值aiMaterial* material = scene->mMaterials[mesh->mMaterialIndex];//分别构造两个纹理数组存放漫反射和镜面反射纹理vector<Texture> diffuseMaps = loadMaterialTextures(material,aiTextureType_DIFFUSE, "texture_diffuse");textures.insert(textures.end(), diffuseMaps.begin(), diffuseMaps.end()); //填充vector<Texture> specularMaps = loadMaterialTextures(material,aiTextureType_SPECULAR, "texture_specular");textures.insert(textures.end(), specularMaps.begin(), specularMaps.end());}return Mesh(vertices, indices, textures);}//加载与存储纹理vector<Texture> loadMaterialTextures(aiMaterial* mat, aiTextureType type,string typeName){vector<Texture> textures;for (unsigned int i = 0; i < mat->GetTextureCount(type); i++){aiString str;mat->GetTexture(type, i, &str);Texture texture;texture.id = TextureFromFile(str.C_Str(), directory);texture.type = typeName;texture.path = str.C_Str();textures.push_back(texture);}return textures;}//读取纹理文件unsigned int TextureFromFile(const char* path, const string& directory){string filename = string(path);filename = directory + '/' + filename;unsigned int textureID;glGenTextures(1, &textureID);int width, height, nrComponents;unsigned char* data = stbi_load(filename.c_str(), &width, &height, &nrComponents, 0);if (data){GLenum format;if (nrComponents == 1)format = GL_RED;else if (nrComponents == 3)format = GL_RGB;else if (nrComponents == 4)format = GL_RGBA;glBindTexture(GL_TEXTURE_2D, textureID);glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);glGenerateMipmap(GL_TEXTURE_2D);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);stbi_image_free(data);}else{std::cout << "Texture failed to load at path: " << path << std::endl;stbi_image_free(data);}return textureID;   //返回textureID}
};
#endif

主函数修改

添加了model的构造函数
旋转修改模型改为绕着一个Y轴旋转
我自己定义了光源，所以并没有删除mesh函数的构造

int main() {//初始化GLFWwindow* window = init(); //创建一个窗口指针，因为里边是一个空指针所有init函数必须改变类型//着色    Shader lightShader("lamp.vert", "lamp.frag");Shader cubeShader("cube.vert", "cube.frag");    //使用封装shader类glm::mat4 trans = glm::mat4(1.0f);  //单位矩阵glm::mat4 model = glm::mat4(1.0f);  //模型矩阵：用于物体坐标转化为世界坐标glm::mat4 view = glm::mat4(1.0f);glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);   //防止窗口对鼠标进行拦截//渲染引擎glEnable(GL_DEPTH_TEST);    //打开深度缓存//生成mesh：光照用Mesh mesh = processCubeMesh();//使用model类生成model对象Model ourModel("D:/openGLResource/bin/nanosuit/nanosuit.obj");while (!glfwWindowShouldClose(window)) {    //当需要退出时候退出//因为每一个循环的进入时间不一样，确保推进的距离一样，要用到时间差currentFrame = glfwGetTime();deltaTime = currentFrame - lastFrame;lastFrame = currentFrame;processInput(window); //每个周期都调用键位函数//动态变化摄像机位置float radius = 10.0f;   //半径float camX = sin(glfwGetTime()) * radius;float camZ = cos(glfwGetTime()) * radius;//设置颜色值和透明度，需要链接opengl32库才行glClearColor(0.2f, 0.3f, 0.3f, 0.1f);   //背景glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);   //清理颜色或者深度缓存//绘制立方体trans = glm::mat4(1.0f);model = glm::translate(trans, cubePositions[0]);    //只变换位置用来区分不同的立方体model = glm::rotate(model, (float)glfwGetTime(), glm::vec3(0.0f, 3.0f, 0.0f));  //角度（逆向），绕view = camera.GetViewMatrix();glm::mat4 projection;   //投影projection = glm::perspective(glm::radians(camera.fov), 800.0f / 600.0f, 0.1f, 100.0f);  //透视投影：FOV，屏幕长宽比，近，远。cubeShader.useShader();//传值给传送多个矩阵让其发生位置变化glUniformMatrix4fv(glGetUniformLocation(cubeShader.ID, "projection"), 1, GL_FALSE, glm::value_ptr(projection));glUniformMatrix4fv(glGetUniformLocation(cubeShader.ID, "view"), 1, GL_FALSE, glm::value_ptr(view));glUniformMatrix4fv(glGetUniformLocation(cubeShader.ID, "model"), 1, GL_FALSE, glm::value_ptr(model));glUniform4f(glGetUniformLocation(cubeShader.ID, "lightPos"), cubePositions[1].r, cubePositions[1].g, cubePositions[1].b, 1);   //注意lightposion的三个值,现在是齐次坐标glUniform3f(glGetUniformLocation(cubeShader.ID, "viewPos"), camera.Position.r, camera.Position.g, camera.Position.b);   //观察的方向glUniform3f(glGetUniformLocation(cubeShader.ID, "front"), camera.Front.r, camera.Front.g, camera.Front.b);   //相机朝向的方向glUniform3f(glGetUniformLocation(cubeShader.ID, "objectColor"), 1.0f, 0.5f, 0.31f);glUniform3f(glGetUniformLocation(cubeShader.ID, "lightColor"), 1.0f, 1.0f, 1.0f);//绘制mesh//mesh.Draw(cubeShader);ourModel.Draw(cubeShader);//绑定第二个立方体model = glm::translate(trans, cubePositions[2]);glUniformMatrix4fv(glGetUniformLocation(cubeShader.ID, "model"), 1, GL_FALSE, glm::value_ptr(model));//mesh.Draw(cubeShader);//画第二个立方体//ourModel.Draw(cubeShader);//绘制光源trans = glm::mat4(1.0f);model = glm::translate(trans, cubePositions[1]);model = glm::scale(model, glm::vec3(0.2f, 0.2f, 0.2f));trans = projection * view * model;lightShader.useShader();    //注意这是新的useShader了glUniform3f(glGetUniformLocation(lightShader.ID, "lightColor"), 1.0f, 1.0f, 1.0f);glUniformMatrix4fv(glGetUniformLocation(lightShader.ID, "transform"), 1/*个矩阵*/, GL_FALSE,glm::value_ptr(trans));  //设置偏移矩阵mesh.Draw(lightShader);//ourModel.Draw(lightShader);glfwSwapBuffers(window);glfwPollEvents();   //立即处理已经到位的事件,如果没有这个就会一直渲染而不触发事件       }//退出glfwTerminate();return 0;
}

结果

只有纹理的漫反射而没有什么衰减等因素的影响

只取消光衰减之后的样子，注意漫反射以及镜面反射

opengl模型加载相关推荐

OpenGL模型加载和渲染
OpenGL模型加载和渲染先上图,再解答. 完整主要的源代码源代码剖析先上图,再解答. 完整主要的源代码 #include <stdio.h> #include "GL/g ...
QT+OpenGL模型加载 - Assimp
QT+OpenGL模型加载 - Assimp 本篇完整工程见gitee:OpenGL 对应点的tag,由turbolove提供技术支持,您可以关注博主或者私信博主模型加载先来张图: 我们不大可能手 ...
OpenGL模型加载之模型
参考: https://learnopenglcn.github.io/03%20Model%20Loading/03%20Model/ 定义一个模型类 class Model {public:/* ...
OpenGL OBJ模型加载.
在我们前面绘制一个屋,我们可以看到,需要每个立方体一个一个的自己来推并且还要处理位置信息.代码量大并且要时间.现在我们通过加载模型文件的方法来生成模型文件,比较流行的3D模型文件有OBJ,FBX,da ...
OpenGL Assimp模型加载库
OpenGL Assimp库前言模型加载库构建Assimp 前言到目前为止的所有场景中,我们一直都在滥用我们的箱子朋友,但时间久了甚至是我们最好的朋友也会感到无聊.在日常的图形程序中,通常都会 ...
OpenGL ES 加载3D模型
前面绘制的矩形.立方体确实确实让人看烦了,并且实际生活中的物体是非常复杂的,我们不可能像前面哪样指定顶点来绘制,因此本篇博客就说明通过OpenGL ES加载一个3D模型.这样复杂物体的设计工作就可以交 ...
OpenGL学习脚印:模型加载初步-加载obj模型(load obj model)
写在前面前面介绍了光照基础内容,以及材质和lighting maps,和光源类型,我们对使用光照增强场景真实感有了一定了解.但是到目前为止,我们通过在程序中指定的立方体数据,绘制立方体,看起来还是很 ...
Android OpenGLES2.0（十四）——Obj格式3D模型加载
转自:http://blog.csdn.net/junzia/article/details/54300202 在博主<OpenGLES系列>文章中,最开始的几篇讲的就是OpenGL世界中 ...
用Assimp模型加载库加载一个Crytek的游戏孤岛危机(Crysis)中的原版纳米装(Nanosuit)
用这个例子来对GitHub上的LearnOpenGL教程前四个单元用到的所有自定义或者引入的各种头文件和资源进行一个总结,不得不说这个教程简直太美妙了. 这个模型是来自对GitHub上的LearnOp ...
Python时间序列模型推理预测实战：时序推理数据预处理（特征生成、lstm输入结构组织）、模型加载、模型预测结果保存、条件判断模型循环运行
Python时间序列模型推理预测实战:时序推理数据预处理(特征生成.lstm输入结构组织).模型加载.模型预测结果保存.条件判断模型循环运行目录

opengl模型加载

环境配置以及视角修改和着色器亮度修改

model函数

主函数修改

结果

opengl模型加载相关推荐

最新文章

热门文章