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我想在我的 openGL 程序中启用照明，我已经为使用 GLUT 绘制的对象工作了。但是当我画我的长方体时

glBegin(5);
glVertex3f((x_+(b/2)),y_,(z_-(l/2)));
glVertex3f((x_+(b/2)),y_,(z_+(l/2)));
glVertex3f((x_-(b/2)),y_,(z_-(l/2)));
glVertex3f((x_-(b/2)),y_,(z_+(l/2)));
glVertex3f((x_+(b/2)),y_t,(z_-(l/2)));
glVertex3f((x_+(b/2)),y_t,(z_+(l/2)));
glVertex3f((x_-(b/2)),y_t,(z_-(l/2)));
glVertex3f((x_-(b/2)),y_t,(z_+(l/2)));
glVertex3f((x_+(b/2)),y_,(z_-(l/2)));
glVertex3f((x_+(b/2)),y_t,(z_-(l/2)));
glVertex3f((x_+(b/2)),y_,(z_+(l/2)));
glVertex3f((x_+(b/2)),y_t,(z_+(l/2)));
glVertex3f((x_-(b/2)),y_,(z_-(l/2)));
glVertex3f((x_-(b/2)),y_t,(z_-(l/2)));
glVertex3f((x_-(b/2)),y_,(z_+(l/2)));
glVertex3f((x_-(b/2)),y_t,(z_+(l/2)));
glVertex3f((x_-(b/2)),y_,(z_-(l/2)));
glVertex3f((x_-(b/2)),y_t,(z_-(l/2)));
glVertex3f((x_+(b/2)),y_,(z_-(l/2)));
glVertex3f((x_+(b/2)),y_t,(z_-(l/2)));
glVertex3f((x_-(b/2)),y_,(z_+(l/2)));
glVertex3f((x_-(b/2)),y_t,(z_+(l/2)));
glVertex3f((x_+(b/2)),y_,(z_+(l/2)));
glVertex3f((x_+(b/2)),y_t,(z_+(l/2)));
glEnd();

和

glColor3f(6,0,0);

闪电不会应用在其表面上。（长方体绘制正确）

我的闪电设置是这样的：

glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHT0);
glEnable(GL_NORMALIZE);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_LIGHTING);

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, 1.0, 1.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };

glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);

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, high_shininess);

有人知道我的缺陷吗？

4

1 回答 1

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你没有给它任何法线。您需要使用 glNormal3f 来指定法线。

glBegin(GL_TRIANGLE_STRIP);
glNormal3f(0,1,0);
glVertex3f((x_+(b/2)),y_,(z_-(l/2)));
glVertex3f((x_+(b/2)),y_,(z_+(l/2)));
glVertex3f((x_-(b/2)),y_,(z_-(l/2)));
glVertex3f((x_-(b/2)),y_,(z_+(l/2)));
glNormal3f(-1,0,0);
// etc.
于 2012-11-11T16:06:25.490 回答