是否可以将纹理映射到由参数方程生成并使用GL_POINTS原语渲染的Sphere？如果有可能，如何完成并在我的代码中，我从Web上复制代码图像加载代码并按照指示加载它。我没有遵循它们的一件事是指定纹理坐标的顶点，我不知道如何使用Sphere和GL_POINTS原语渲染它时如何准确指定它。
我正在使用旧的OpenGL2进行项目并进行太阳系模拟
以下是repository to the code，它是公开的
这就是我生成球体
的方法health constant.Weight.UPDATE_TIME这是我的loadTexture方法
// void Sphere::render () method, inside src/sphere.cpp - line 28
void Sphere::render () {
unsigned int angle = 0, angle2 = 0;
const double degree_to_rad = 3.14 / 180.0;
double value = .0, value2 = .0;
if ( this -> texture_file_name != "" ) {
glEnable ( GL_TEXTURE_2D );
glBindTexture( GL_TEXTURE_2D, this -> texture );
}
glBegin ( GL_POINTS );
for ( ; angle < 360; ++ angle ) {
value = angle * degree_to_rad;
for ( ; angle2 < 180; ++ angle2 ) {
value2 = angle2 * degree_to_rad;
/*/////////////////////////////////////////////
// do I need to do sth in here like glTexCoord2d ( ... ) ?
////////////////////////////////////////////*/
glVertex3d (
this -> calculateX ( value, value2 ),
this -> calculateY ( value, value2 ),
this -> calculateZ ( value )
);
}
angle2 = 0;
}
glEnd ();
if ( this -> texture_file_name != "" ) {
glDisable ( GL_TEXTURE_2D );
}
};
// void Sphere::draw () method, src/sphere.cpp - line 75
void Sphere::draw () {
glPushMatrix ();
glTranslated (
this -> coordinate [ 0 ],
this -> coordinate [ 1 ],
this -> coordinate [ 2 ]
);
glRotated (
this -> angle_degree,
this -> rotation [ 0 ],
this -> rotation [ 1 ],
this -> rotation [ 2 ]
);
this -> render ();
glPopMatrix ();
};
double Sphere::calculateX ( const double theta_degree_angle, const double phi_degree_angle ) {
return this -> radius * sin ( theta_degree_angle ) * cos ( phi_degree_angle );
};
double Sphere::calculateY ( const double theta_degree_angle, const double phi_degree_angle ) {
return this -> radius * sin ( theta_degree_angle ) * sin ( phi_degree_angle );
};
double Sphere::calculateZ ( const double theta_degree_angle ) {
return this -> radius * cos ( theta_degree_angle );
};
这是我的main.cpp
void Object::loadTexture () {
int & w = this -> texture_width, & h = this -> texture_height;
unsigned char * data = new unsigned char [ w * h * 3 ];
FILE * file;
try {
file = fopen ( this -> texture_file_name.c_str () , "rb" );
if ( !file ) return;
fread ( data, w * h * 3, 1, file );
fclose ( file );
} catch ( std::exception & error ) {
std::cout << "Loading Texture Error: " << error.what () << std::endl;
}
glGenTextures ( 1, & this -> texture );
glBindTexture ( GL_TEXTURE_2D, this -> texture );
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, data );
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL );
glTexParameterf ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameterf ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
delete [] data;
};
void Object::setTexture ( const char * file_name, const int width, const int height ) {
this -> texture_file_name = file_name;
this -> texture_width = width;
this -> texture_height = height;
this -> loadTexture ();
};
仅供参考：该项目表示它是2D，但实际上我只是为了澄清它而在3D中进行。