OpenGL超级宝典笔记——镜面光与法线平均

GLfloat specref[] &＃61; {1.0f, 1.0f, 1.0f, 1.0f};

....//Enable color tracking

glEnable(GL_COLOR_MATERIAL);

//set material properties to follow

glColorglColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);

//使后面的材料具有完全的镜面反射效果以及强光泽

glMaterialfv(GL_FRONT, GL_SPECULAR, specref);

glMateriali(GL_FRONT, GL_SHININESS, 128);

//光源位置 GLfloat lightPos[] &＃61; {0.0f, 0.0f, 70.0f, 1.0f};
..
glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
lightPos数组的前三个值x,y,z指定了光源的位置或者方向。如果最后一个值为1.0&＃xff0c;说明光源的真实位置就位于lightPos上&＃xff0c;是位置性光源&＃xff0c;光线从光源发散开来。如果最后一个值为0.0则代表光在无限远处&＃xff0c;光源是方向性光源&＃xff0c;所有光线是平行的。

#include "gltools.h"
GLfloat ambientLight[] &＃61; {0.5f, 0.5f, 0.5f, 1.0f};
GLfloat specular[] &＃61; {1.0f, 1.0f, 1.0f, 1.0f};
GLfloat specref[] &＃61; {1.0f, 1.0f, 1.0f, 1.0f};
//光源位置
GLfloat lightPos[] &＃61; {0.0f, 0.0f, 70.0f, 1.0f};
//聚光灯光照方向朝z轴负方向
GLfloat spotDir[] &＃61; {0.0f, 0.0f, -1.0f};
//用于旋转
static GLfloat xRot &＃61; 0.0f;
static GLfloat yRot &＃61; 0.0f;
#define FLAT_MODE 1
#define SMOOTH_MODE 2
#define LOW_LEVEL 3
#define MEDIUM_LEVEL 4
#define HIGH_LEVEL 5
int iShade &＃61; FLAT_MODE;
int iLevel &＃61; LOW_LEVEL;
void SetupRC()
{glClearColor(0.0f, 0.0f, 0.0f, 1.0f); //开启深度测试 glEnable(GL_DEPTH_TEST); //剔除掉不必要的背面 glFrontFace(GL_CCW);glEnable(GL_CULL_FACE);glCullFace(GL_BACK); //开启光照 glEnable(GL_LIGHTING); //设置light0光照参数 glLightfv(GL_LIGHT0, GL_AMBIENT_AND_DIFFUSE, ambientLight);glLightfv(GL_LIGHT0, GL_SPECULAR, specular);//设置光源位置和方向 glLightfv(GL_LIGHT0, GL_POSITION, lightPos);glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, spotDir);glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 80.0f); //设置全局环境光 glLightModelfv(GL_AMBIENT, ambientLight); //开启light0 glEnable(GL_LIGHT0); //开启和设置颜色追踪 glEnable(GL_COLOR_MATERIAL); //设置多边形正面的材料的环境光和漫反射光属性为颜色追踪 glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE); //设置镜面光的反射属性 glMaterialfv(GL_FRONT, GL_SPECULAR, specref);glMateriali(GL_FRONT, GL_SHININESS, 128);glEnable(GL_NORMALIZE);
} void RenderScene()
{ if (iShade &＃61;&＃61; FLAT_MODE){glShadeModel(GL_FLAT);} else {glShadeModel(GL_SMOOTH);}glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //矩阵压栈 glPushMatrix();glRotatef(xRot, 1.0f, 0.0f, 0.0f);glRotatef(yRot, 0.0f, 1.0f, 0.0f); //旋转后重新设置光源位置glLightfv(GL_LIGHT0, GL_POSITION, lightPos);glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, spotDir);glTranslatef(lightPos[0], lightPos[1], lightPos[2]);glColor3ub(255, 0, 0);glutSolidCone(4.0, 6.0, 15, 15);glPushAttrib(GL_LIGHTING_BIT); //关闭光照画小黄球 glDisable(GL_LIGHTING);glColor3ub(255, 255, 0);glutSolidSphere(3.0, 15, 15);glPopAttrib(); //矩阵出栈glPopMatrix();glColor3ub(0, 0, 255); if (iLevel &＃61;&＃61; LOW_LEVEL){glutSolidSphere(30.0f, 8, 8);} else if (iLevel &＃61;&＃61; MEDIUM_LEVEL){glutSolidSphere(30.0f, 10, 10);} else {glutSolidSphere(30.0f, 15, 15);}glutSwapBuffers();
}void ChangeSize(int w, int h)
{
if (h &＃61;&＃61; 0){h &＃61; 1;} //设置视口 glViewport(0, 0, w, h);GLfloat faspect &＃61; (GLfloat)w/(GLfloat)h; //透视投影变换 glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(35.0, faspect, 1.0, 350.0); //模型视图矩阵 glMatrixMode(GL_MODELVIEW);glLoadIdentity(); //先往显示器里平移 glTranslatef(0.0f, 0.0f, -250.0f);glutPostRedisplay();
} void SpecialKeys(int keys, int x, int y)
{
//改变旋转角度 if (keys &＃61;&＃61; GLUT_KEY_UP){xRot -&＃61; 5.0f;} if (keys &＃61;&＃61; GLUT_KEY_DOWN){xRot &＃43;&＃61; 5.0f;} if (keys &＃61;&＃61; GLUT_KEY_LEFT){yRot &＃43;&＃61; 5.0f;} if (keys &＃61;&＃61; GLUT_KEY_RIGHT){yRot -&＃61; 5.0f;} if (xRot > 356.0f){xRot &＃61; 0.0f;} else if (xRot <-1.0f){xRot &＃61; 355.0f;} if (yRot > 356.0f){yRot &＃61; 0.0f;} else if (yRot <-1.0f){yRot &＃61; 355.0f;}glutPostRedisplay();
} void ProcessMenu(int key)
{
switch(key){ case 1:iShade &＃61; FLAT_MODE; break; case 2:iShade &＃61; SMOOTH_MODE; break; case 3:iLevel &＃61; LOW_LEVEL; break; case 4:iLevel &＃61; MEDIUM_LEVEL; break; case 5:iLevel &＃61; HIGH_LEVEL; break; default: break;}glutPostRedisplay();
} int main(int args, char *arv[])
{glutInit(&args, arv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);glutInitWindowSize(800, 600);glutCreateWindow("spot light");glutDisplayFunc(RenderScene);glutReshapeFunc(ChangeSize);glutSpecialFunc(SpecialKeys); //创建菜单int menuID &＃61; glutCreateMenu(ProcessMenu);glutAddMenuEntry("Flag Mode", 1);glutAddMenuEntry("SMOOTH Mode", 2);glutAddMenuEntry("Low Level", 3);glutAddMenuEntry("Midum Level", 4);glutAddMenuEntry("High Level", 5);glutAttachMenu(GLUT_RIGHT_BUTTON);SetupRC();glutMainLoop(); return 0;
}