计算机图形学光照处理实例

#define WIN32_LEAN_AND_MEAN //裁减过大的函数库 #include <windows.h> //标准Windows应用程序头文件 #include <gl/gl.h> //标准OpenGL头文件 #include <gl/glu.h> //OpenGL实用工具库 #include <gl/glut.h> #include <gl/glaux.h> //OpenGL辅助函数库 #include "vase.h" //全局变量 GLfloat xrot; // X 旋转量 GLfloat yrot; // Y 旋转量 GLfloat xspeed; // X 旋转增量 GLfloat yspeed; // Y 旋转增量 GLfloat z=-5.0f; // 屏幕深度 HDC g_HDC; //全局设备环境 bool fullScreen = false; //是否全屏幕 GLboolean g_keys[256]; //按键信息 如果按下 对应的值为true POINTF lpPoints[4]; //bezier控制点 //光源 GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f }; //环境光 GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f }; //散射光 GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f }; //光的位置 POINTF point1[100]; POINTF point2[100]; POINTF point[200]; //拼接的Bezier曲线 VPOINT points[80000]; //旋转后生成的点 int sum=0; //点的个数 int row=0; VPOINT pointbuttom[400]; int buttom=0; //花瓶数据 void projector1(POINTF lpPoints[], int k) { int i=0; for (double t = 0; t <= 1; t = t + 0.01) //得bezier上的点 { POINTF p1; p1.x = (float)(pow((1 - t), 3) * lpPoints[0].x + 3 * t * pow((1 - t), 2) * lpPoints[1].x + 3 * pow(t, 2) * (1 - t) * lpPoints[2].x + pow(t, 3) * lpPoints[3].x); p1.y = (float)(pow((1 - t), 3) * lpPoints[0].y + 3 * t * pow((1 - t), 2) * lpPoints[1].y + 3 * pow(t, 2) * (1 - t) * lpPoints[2].y + pow(t, 3) * lpPoints[3].y); if (k==0) { point1[i].x=p1.x; point1[i].y=p1.y; i=i+1; } else { point2[i].x=p1.x; point2[i].y=p1.y; i=i+1; } } } //两条曲线拼接成一条曲线 void add() { for (int i=0;i<200;i++) { if (i<100) { point[i].x=point1[i].x; point[i].y=point1[i].y; } else { point[i].x=point2[i-100].x; point[i].y=point2[i-100].y; } } } void projector2() { //VPOINT p; int i; for (double angle = 0; angle <= 2 * PAI; angle += 0.05) { for (i = 0; i < 200; i++) { points[sum].x = (float)(point[i].x * cos(angle)); //绕y旋转 points[sum].z = (float)(point[i].x * sin(angle)); points[sum].y = (float)(point[i].y); sum = sum + 1; } row = row + 1; } } void vase() { //************************************************************ //花瓶的第一条Bezier曲线 /*lpPoints[0].x = 18; lpPoints[0].y = -80; lpPoints[1].x = -18; lpPoints[1].y = 40; lpPoints[2].x = -40; lpPoints[2].y = 30; lpPoints[3].x = -55; lpPoints[3].y = 15; */ lpPoints[0].x = 60; lpPoints[0].y = -40; lpPoints[1].x = -30; lpPoints[1].y = 38; lpPoints[2].x = 0; lpPoints[2].y = -0; lpPoints[3].x = 5; lpPoints[3].y = -120; projector1(lpPoints, 0); //*********************************************************** //花瓶的第二条Bezier曲线 lpPoints[0].x = -0; lpPoints[0].y = 10; lpPoints[1].x = -0; lpPoints[1].y = 10; lpPoints[2].x = 10; lpPoints[2].y = -0; lpPoints[3].x =0; lpPoints[3].y = -0; projector1(lpPoints, 1); add(); projector2(); } void keyfun() { if (g_keys[VK_PRIOR]) //前 { z-=0.02f; } if (g_keys[VK_NEXT]) //后 { z+=0.02f; } if (g_keys[VK_UP]) //上 { xspeed-=0.01f; } if (g_keys[VK_DOWN]) //下 { xspeed+=0.01f; } if (g_keys[VK_RIGHT]) //右 { yspeed+=0.01f; } if (g_keys[VK_LEFT]) //左 { yspeed-=0.01f; } } void DisplaySence() { int i , j ; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer glLoadIdentity(); // Reset The View glTranslatef(0.0f,0.0f,z); glRotatef(yrot,0.0f,1.0f,0.0f); glRotatef(xrot,1.0f,0.0f,0.0f); for (j = 0; j < row - 1; j++) { for (i = 1; i < 200; i++) { glBegin(GL_QUAD_STRIP); glNormal3f(points[j * 200 + i].x / 100, points[j * 200 + i].y / 100, points[j * 200 + i].z / 100); glVertex3f(points[j * 200 + i].x / 100, points[j * 200 + i].y / 100, points[j * 200 + i].z / 100); glNormal3f(points[j * 200 + i - 1].x / 100, points[j * 200 + i - 1].y / 100, points[j * 200 + i - 1].z / 100); glVertex3f(points[j * 200 + i - 1].x / 100, points[j * 200 + i - 1].y / 100, points[j * 200 + i - 1].z / 100); glNormal3f(points[j * 200 + i + 200].x / 100, points[j * 200 + i + 200].y / 100, points[j * 200 + i + 200].z / 100); glVertex3f(points[j * 200 + i + 200].x / 100, points[j * 200 + i + 200].y / 100, points[j * 200 + i + 200].z / 100); glNormal3f(points[j * 200 + i + 200 - 1].x / 100, points[j * 200 + i + 200 - 1].y / 100, points[j * 200 + i + 200 - 1].z / 100); glVertex3f(points[j * 200 + i + 200 - 1].x / 100, points[j * 200 + i + 200 - 1].y / 100, points[j * 200 + i + 200 - 1].z / 100); glEnd(); } } int row1; row1=row-1; //最后的 for (i = 0; i < 199; i++) { glBegin(GL_QUADS); glNormal3f(points[i].x/100,points[i].y/100,points[i].z/100); glVertex3f(points[i].x/100,points[i].y/100,points[i].z/100); glNormal3f(points[i+1].x/100,points[i+1].y/100,points[i+1].z/100); glVertex3f(points[i+1].x/100,points[i+1].y/100,points[i+1].z/100); glNormal3f(points[row1*200+i+1].x/100,points[row1*200+i+1].y/100,points[row1*200+i+1].z/100); glVertex3f(points[row1*200+i+1].x/100,points[row1*200+i+1].y/100,points[row1*200+i+1].z/100); glNormal3f(points[row1*200+i].x/100,points[row1*200+i].y/100,points[row1*200+i].z/100); glVertex3f(points[row1*200+i].x/100,points[row1*200+i].y/100,points[row1*200+i].z/100); glEnd(); } //glEnable(GL_AUTO_NORMAL); //花瓶 瓶底 glEnable(GL_NORMALIZE); glBegin(GL_POLYGON); for (i = 0 ; i < row ; i++ ) glVertex3f(points[i*200+199].x/100,points[i*200+199].y/100,points[i*200+199].z/100); glEnd(); glFlush(); SwapBuffers(g_HDC); xrot+=xspeed; yrot+=yspeed; } //Render //说明：初始化 void InitGL() { glEnable(GL_DEPTH_TEST); // 启动深度检测 //在此处绘制 glClearColor(0.6f, 0.6f, 0.6f, 0.6f); // 设置清理色为黑色 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // 清理颜色和深度缓存 glLoadIdentity(); // 复位模型视图矩阵 //光照 /*float mat_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f }; float mat_shiniess[] = { 50.0f }; float light_position[] = { 1.0f, 1.0f, 1.0f, 0.0f }; float white_light[] = { 1.0f, 1.0f, 1.0f, 1.0f }; float lmodel_ambient[] = { 0.1f, 0.1f, 0.1f, 1.0f }; glShadeModel(GL_SMOOTH); glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); glMaterialfv(GL_FRONT, GL_SHININESS, mat_shiniess); glLightfv(GL_LIGHT0, GL_POSITION, light_position); glLightfv(GL_LIGHT0, GL_DIFFUSE, white_light); glLightfv(GL_LIGHT0, GL_SPECULAR, white_light); glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); */ GLfloat ambient[]={2.0,2.0,2.0,1.0}; GLfloat diffuse[]={1.0,1.0,0.0,1.0}; GLfloat specular[]={5.0,2.0,1.1,0.0}; GLfloat position[]={2.0,5.-0,5.0,0.0}; glLightfv(GL_LIGHT0,GL_AMBIENT,ambient); glLightfv(GL_LIGHT0,GL_DIFFUSE,diffuse); glLightfv(GL_LIGHT0,GL_SPECULAR,specular); glLightfv(GL_LIGHT0,GL_POSITION,position); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LESS); glEnable(GL_AUTO_NORMAL); glEnable(GL_NORMALIZE); GLfloat mat_ambient[]={0.6,0.4,