网站忧化技巧,大型电子商务网站开发,排名好的移动网站建设,网站域名备案证书下载文章目录 渲染成果Assimp库准备#xff1a;Mesh类修改#xff1a;透明贴图使用#xff1a;光源封装#xff1a;使用方式在如下测试环境中#xff1a; 渲染成果 Assimp库准备#xff1a;
从GitHub拉取源码#xff0c;根据网络教程#xff0c;借助CMake生成VS工程项目Mesh类修改透明贴图使用光源封装使用方式在如下测试环境中 渲染成果 Assimp库准备
从GitHub拉取源码根据网络教程借助CMake生成VS工程项目并用VS将其编译为静态链接库lib或动态链接库dll lib。最后将其库文件和工程内的include文件复制到图形工程下。
Mesh类修改
在抽象ModelMesh这些类时我改动LearnOpenGL的最大的类是Mesh类将其直接使用的GLAPI替换成了封装好的API类如下。修改的数据结构在Model中修改相应的数据存放方法即可
//Mesh.h#pragma once
#include GL/glew.h
#include GLFW/glfw3.h#include glm/glm.hpp#include vector#include Shader.h
#include VertexArray.h
#include VertexBuffer.h
#include VertexBufferLayout.h
#include IndexBuffer.h
#include Texture.husing namespace std;struct Vertex
{glm::vec3 Position;glm::vec3 Normal;glm::vec2 TexCoords;
};struct TextureData
{string name;Texture* texture;
};class Mesh
{
public:vectorVertex vertices;vectorGLuint indices;vectorTextureData textures;Mesh(vectorVertex vertices, vectorGLuint indices, vectorTextureData textures);void Draw(Renderer renderer, Shader shader);private:VertexArray VAO;VertexBuffer VBO;IndexBuffer EBO;void setupMesh();
};//Mesh.cpp
#include Mesh.hMesh::Mesh(vectorVertex vertices, vectorGLuint indices, vectorTextureData textures)
{this-vertices vertices;this-indices indices;this-textures textures;this-setupMesh();
}void Mesh::setupMesh()
{VAO.Bind();VBO.Init(vertices[0], vertices.size() * sizeof(Vertex));EBO.Init(indices[0], indices.size());VAO.AddVertexBuffer(VBO);VAO.Unbind();
}void Mesh::Draw(Renderer renderer, Shader shader)
{for (int i 0; i textures.size(); i){textures[i].texture-Bind(i);shader.SetUniform1i(textures[i].name, i);}renderer.Draw(VAO, EBO, shader);
}透明贴图使用
我所需要绘制的模型有半透明的面部贴图因此需要使用透明度这里需要注意的是如果所有使用数据获取数据的地方都没有出错但仍没有透明效果可以检查原始数据的问题如图片本身的透明效果在工程中加载图片时是否包含透明通道。
//shader
void main()
{vec3 norm normalize(Normal);vec3 viewDir normalize(viewPos - FragPos);//透明测试vec4 texColor texture(texture_diffuse, TexCoords);if(texColor.a 0.2 mixFactor 0)discard;//光照着色color vec4(CalcPointLight(light, norm, FragPos, viewDir), 1);
}光源封装
每次使用光源需要大段的赋值语句因此对其进行简单封装目前只封装了点光源
//Light.h#pragma once
#include iostream
#include glm/glm.hpp#include Shader.husing namespace std;class Light
{
public:Light(glm::vec3 position { 1.2f, 1.0f, 2.0f }, glm::vec3 ambient { 0.4, 0.4, 0.4 },glm::vec3 diffuse { 1.2, 1.2, 1.2 },glm::vec3 specular { 0.1, 0.1, 0.1 },float constant 1, float linear 0.09, float quadratic 0.032);void SetupShader(Shader shader, string lightName);private:glm::vec3 m_Position;glm::vec3 m_Ambient;glm::vec3 m_Diffuse;glm::vec3 m_Specular;float m_Constant;float m_Linear;float m_Quadratic;
};//Light.cpp
#include Light.hLight::Light(glm::vec3 position, glm::vec3 ambient, glm::vec3 diffuse, glm::vec3 specular, float constant, float linear, float quadratic)
{m_Position position;m_Ambient ambient;m_Diffuse diffuse;m_Specular specular;m_Constant constant;m_Linear linear;m_Quadratic quadratic;
}void Light::SetupShader(Shader shader, std::string lightName)
{shader.SetUniform3f(lightName .position, m_Position.x, m_Position.y, m_Position.z);shader.SetUniform3f(lightName .ambient, m_Ambient.x, m_Ambient.y, m_Ambient.z);shader.SetUniform3f(lightName .diffuse, m_Diffuse.x, m_Diffuse.y, m_Diffuse.z);shader.SetUniform3f(lightName .specular, m_Specular.x, m_Specular.y, m_Specular.z);shader.SetUniform1f(lightName .constant, m_Constant);shader.SetUniform1f(lightName .linear, m_Linear);shader.SetUniform1f(lightName .quadratic, m_Quadratic);
}
使用方式在如下测试环境中
#pragma once#include RunBase.h#include Model.h
#include Light.h#include glm/gtc/type_ptr.hppclass AssimpTest : public RunBase
{
public:Model* body, *blue, *ear, *eye, *mao, *mouth;Shader diffuseShader;Renderer renderer;Light light;AssimpTest() : RunBase(){diffuseShader.Init(res/shaders/AssimpTest.shader);}virtual void Init(GLFWwindow* window, float targetFrameTime) override{/*GLCall(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC1_ALPHA));GLCall(glEnable(GL_BLEND));*/body new Model(res/models/jixuanyou/body.obj);blue new Model(res/models/jixuanyou/blue.obj);ear new Model(res/models/jixuanyou/ear.obj);eye new Model(res/models/jixuanyou/eye.obj);mao new Model(res/models/jixuanyou/mao.obj);mouth new Model(res/models/jixuanyou/mouth.obj);}virtual void RenderLoop(GLFWwindow* window, float targetFrameTime) override{renderer.Clear();//绘制受光物体diffuseShader.Bind();//视图矩阵透视参数glm::mat4 view(1), proj(1), model(1);view camera.GetViewMatrix();proj glm::perspectiveGLfloat(45, 640 / 480, .1f, 100.f);//赋值透视diffuseShader.SetUniformMat4f(view, glm::value_ptr(view));diffuseShader.SetUniformMat4f(projection, glm::value_ptr(proj));diffuseShader.SetUniformMat4f(model, glm::value_ptr(model));//赋值光照light.SetupShader(diffuseShader, light);//赋值视图位置diffuseShader.SetUniform3f(viewPos, camera.Position.x, camera.Position.y, camera.Position.z);diffuseShader.SetUniform1f(shininess, 4);// 取消纯色diffuseShader.SetUniform1f(mixFactor, 0);//不透明物件body-Draw(renderer, diffuseShader);ear-Draw(renderer, diffuseShader);eye-Draw(renderer, diffuseShader);mouth-Draw(renderer, diffuseShader);// 使用纯色diffuseShader.SetUniform1f(mixFactor, 1);// 浅蓝色diffuseShader.SetUniform3f(diffuseColor, 0.50, 0.66, 0.81);mao-Draw(renderer, diffuseShader);// 深蓝色diffuseShader.SetUniform3f(light.diffuse, 4, 4, 4);diffuseShader.SetUniform3f(light.specular, 0.5, 0.5, 0.5);diffuseShader.SetUniform3f(diffuseColor, 0.022, 0.06, 0.21);blue-Draw(renderer, diffuseShader);}virtual bool UseCameraControl() override{return true;}
};
