glMaterialfv材質設置用例

發布時間：2020-09-21 08:08:57 來源：網絡閱讀：2422 作者：fengyuzaitu 欄目：編程語言

說明

如果非常清楚的知道物體的材質，并且能夠在OpenGL的材質表中找到合乎要求的參數設置，就可以避免指定物體的顏色值，某些情況下，指定物體的渲染顏色，使得物體的實際效果大打折扣

{

glPushMatrix();

glTranslatef(1.0, 0.0, 0.0);

//黃銅

GLfloat mat_ambient[] = { 0.021500, 0.174500, 0.021500, 0.550000};

GLfloat mat_diffuse[] = { 0.075680, 0.614240, 0.075680, 0.550000};

GLfloat mat_specular[] = { 0.633000, 0.727811, 0.633000, 0.550000 };

GLfloat mat_shininess[] = { 76.800003}; //材質RGBA鏡面指數，數值在0～128范圍內

glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);

glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);

glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);

glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);

glutSolidSphere (1.0, 40, 50); //半徑為 1,40 條緯線,50 條經線

glPopMatrix();

glFlush ();

}

{

glPushMatrix();

glTranslatef(-1.0, 0.0, 0.0);

//翡翠綠

GLfloat mat_ambient[] = { 0.247250, 0.199500, 0.074500, 1.000000};

GLfloat mat_diffuse[] = { 0.751640, 0.606480, 0.226480, 1.000000};

GLfloat mat_specular[] = { 0.628281, 0.555802, 0.366065, 1.000000 };

GLfloat mat_shininess[] = { 51.200001}; //材質RGBA鏡面指數，數值在0～128范圍內

glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);

glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);

glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);

glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);

glutSolidSphere (1.0, 40, 50); //半徑為 1,40 條緯線,50 條經線

glPopMatrix();

}

材質表

//黃銅

0.329412, 0.223529, 0.027451, 1.000000,

0.780392, 0.568627, 0.113725, 1.000000,

0.992157, 0.941176, 0.807843, 1.000000,

27.897400,

//青銅

0.212500, 0.127500, 0.054000, 1.000000,

0.714000, 0.428400, 0.181440, 1.000000,

0.393548, 0.271906, 0.166721, 1.000000,

25.600000,

//亮青銅

0.250000, 0.148000, 0.064750, 1.000000,

0.400000, 0.236800, 0.103600, 1.000000,

0.774597, 0.458561, 0.200621, 1.000000,

76.800003,

//鉻

0.250000, 0.250000, 0.250000, 1.000000,

0.400000, 0.400000, 0.400000, 1.000000,

0.774597, 0.774597, 0.774597, 1.000000,

76.800003,

//銅

0.191250, 0.073500, 0.022500, 1.000000,

0.703800, 0.270480, 0.082800, 1.000000,

0.256777, 0.137622, 0.086014, 1.000000,

12.800000,

//亮銅

0.229500, 0.088250, 0.027500, 1.000000,

0.550800, 0.211800, 0.066000, 1.000000,

0.580594, 0.223257, 0.069570, 1.000000,

51.200001,

//金

0.247250, 0.199500, 0.074500, 1.000000,

0.751640, 0.606480, 0.226480, 1.000000,

0.628281, 0.555802, 0.366065, 1.000000,

51.200001,

//亮金

0.247250, 0.224500, 0.064500, 1.000000,

0.346150, 0.314300, 0.090300, 1.000000,

0.797357, 0.723991, 0.208006, 1.000000,

83.199997,

//白蠟

0.105882, 0.058824, 0.113725, 1.000000,

0.427451, 0.470588, 0.541176, 1.000000,

0.333333, 0.333333, 0.521569, 1.000000,

9.846150,

//銀

0.192250, 0.192250, 0.192250, 1.000000,

0.507540, 0.507540, 0.507540, 1.000000,

0.508273, 0.508273, 0.508273, 1.000000,

51.200001,

//亮銀色

0.231250, 0.231250, 0.231250, 1.000000,

0.277500, 0.277500, 0.277500, 1.000000,

0.773911, 0.773911, 0.773911, 1.000000,

89.599998,

//翡翠、祖母綠

0.021500, 0.174500, 0.021500, 0.550000,

0.075680, 0.614240, 0.075680, 0.550000,

0.633000, 0.727811, 0.633000, 0.550000,

76.800003,

//碧玉

0.135000, 0.222500, 0.157500, 0.950000,

0.540000, 0.890000, 0.630000, 0.950000,

0.316228, 0.316228, 0.316228, 0.950000,

12.800000,

//黑曜石

0.053750, 0.050000, 0.066250, 0.820000,

0.182750, 0.170000, 0.225250, 0.820000,

0.332741, 0.328634, 0.346435, 0.820000,

38.400002,

//珍珠

0.250000, 0.207250, 0.207250, 0.922000,

1.000000, 0.829000, 0.829000, 0.922000,

0.296648, 0.296648, 0.296648, 0.922000,

11.264000,

//紅寶石

0.174500, 0.011750, 0.011750, 0.550000,

0.614240, 0.041360, 0.041360, 0.550000,

0.727811, 0.626959, 0.626959, 0.550000,

76.800003,

//綠寶石、綠松石

0.100000, 0.187250, 0.174500, 0.800000,

0.396000, 0.741510, 0.691020, 0.800000,

0.297254, 0.308290, 0.306678, 0.800000,

12.800000,

//黑塑料

0.000000, 0.000000, 0.000000, 1.000000,

0.010000, 0.010000, 0.010000, 1.000000,

0.500000, 0.500000, 0.500000, 1.000000,

32.000000,

//黑橡膠

0.020000, 0.020000, 0.020000, 1.000000,

0.010000, 0.010000, 0.010000, 1.000000,

0.400000, 0.400000, 0.400000, 1.000000,

10.000000,

//紫羅蘭

0.110000, 0.060000, 0.090000, 1.000000,

0.430000, 0.470000, 0.540000, 1.000000,

0.330000, 0.330000, 0.520000, 1.000000,

22.000000

代碼

# include < GL/glut.h >

/* 初始化材料屬性、光源屬性、光照模型，打開深度緩沖區等 */

void init(void)

{

GLfloat light_position [ ] = { 0., 1.5, 1.5, 0.0 };

glClearColor ( 0.0, 0.0, 1.0, 0.0 ); //設置背景色為藍色

glShadeModel ( GL_SMOOTH );

glLightfv ( GL_LIGHT0, GL_POSITION, light_position);

glEnable (GL_LIGHTING);

glEnable (GL_LIGHT0);

glEnable (GL_DEPTH_TEST);

}

/*調用 GLUT 函數,繪制一個球*/

void display ( void )

{

glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

{

glPushMatrix();

glTranslatef(1.0, 0.0, 0.0);

GLfloat mat_ambient[] = { 0.021500, 0.174500, 0.021500, 0.550000};

GLfloat mat_diffuse[] = { 0.075680, 0.614240, 0.075680, 0.550000};

GLfloat mat_specular[] = { 0.633000, 0.727811, 0.633000, 0.550000 };

GLfloat mat_shininess[] = { 76.800003}; //材質RGBA鏡面指數，數值在0～128范圍內

glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);

glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);

glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);

glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);

glutSolidSphere (1.0, 40, 50); //半徑為 1,40 條緯線,50 條經線

glPopMatrix();

glFlush ();

}

{

glPushMatrix();

glTranslatef(-1.0, 0.0, 0.0);

GLfloat mat_ambient[] = { 0.247250, 0.199500, 0.074500, 1.000000};

GLfloat mat_diffuse[] = { 0.751640, 0.606480, 0.226480, 1.000000};

GLfloat mat_specular[] = { 0.628281, 0.555802, 0.366065, 1.000000 };

GLfloat mat_shininess[] = { 51.200001}; //材質RGBA鏡面指數，數值在0～128范圍內

glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);

glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);

glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);

glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);

glutSolidSphere (1.0, 40, 50); //半徑為 1,40 條緯線,50 條經線

glPopMatrix();

}

glFlush ();

}

/* 定義 GLUT 的 reshape 函數，w、h 分別是輸出圖形的窗口的寬和高*/

void reshape (int w, int h)

{

glViewport (0, 0, (GLsizei) w, (GLsizei) h);

glMatrixMode (GL_PROJECTION);

glLoadIdentity ( );

if (w <= h)

glOrtho (-1.5, 1.5, -1.5 * ( GLfloat ) h / ( GLfloat ) w,

1.5* ( GLfloat ) h / ( GLfloat ) w, -10.0, 10.0 ); //創建平行視景體

else

glOrtho (-1.5 * ( GLfloat ) w / ( GLfloat ) h,1.5 * ( GLfloat )

w/( GLfloat ) h, -1.5, 1.5, -10.0, 10.0);

glMatrixMode ( GL_MODELVIEW );

glLoadIdentity ( ) ;

}

int main(int argc, char** argv)

{

glutInit (&argc, argv); // GLUT 環境初始化

glutInitDisplayMode (GLUT_SINGLE |GLUT_RGB |GLUT_DEPTH); // 顯示模式初始化

glutInitWindowSize (300, 300); // 定義窗口大小

glutInitWindowPosition (100, 100); // 定義窗口位置

glutCreateWindow ( argv [ 0 ] ); // 顯示窗口,窗口標題為執行函數名

init( );

glutDisplayFunc ( display ); // 注冊 OpenGL 繪圖函數(一種特殊的調用方式,下同)

glutReshapeFunc ( reshape ); // 注冊窗口大小改變時的響應函數

glutMainLoop( ); // 進入 GLUT 消息循環，開始執行程序

return 0;

}

注意

值得一提的是glutSolidSphere 必須在指定變換矩陣和設置好材料屬性之后，才應該被調用，否則在設置各種屬性之前調用glutSolidSphere ，會出現其他的異常

例如

{

glPushMatrix();

glTranslatef(1.0, 0.0, 0.0);

glutSolidSphere (1.0, 40, 50); //半徑為 1,40 條緯線,50 條經線

GLfloat mat_ambient[] = { 0.021500, 0.174500, 0.021500, 0.550000};

GLfloat mat_diffuse[] = { 0.075680, 0.614240, 0.075680, 0.550000};

GLfloat mat_specular[] = { 0.633000, 0.727811, 0.633000, 0.550000 };

GLfloat mat_shininess[] = { 76.800003}; //材質RGBA鏡面指數，數值在0～128范圍內

glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);

glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);

glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);

glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);

glPopMatrix();

glFlush ();

}

{

glPushMatrix();

glTranslatef(-1.0, 0.0, 0.0);

glutSolidSphere (1.0, 40, 50); //半徑為 1,40 條緯線,50 條經線

GLfloat mat_ambient[] = { 0.247250, 0.199500, 0.074500, 1.000000};

GLfloat mat_diffuse[] = { 0.751640, 0.606480, 0.226480, 1.000000};

GLfloat mat_specular[] = { 0.628281, 0.555802, 0.366065, 1.000000 };

GLfloat mat_shininess[] = { 51.200001}; //材質RGBA鏡面指數，數值在0～128范圍內

glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);

glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);

glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);

glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);

glPopMatrix();

}

左右兩個球的顏色剛好換掉

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