OpenGL geometric element Rendering

Source: Internet
Author: User

Execute valid functions between glbegin and glend.

Glvertex * () // sets the vertex coordinate glcolor * () // sets the current color glindex * () // sets the current color index glnormal *() // set the coordinates of the normal vector gltexcoord * () // set the texture coordinate glmultitexcoord * ARB () // set the texture coordinate gledgeflag for multiple texture mappings *() // draw glmaterial * () for the control edge // set the glarrayelement () for the material attribute // extract the vertex array data glevalcoord * () and glevalpoint * () // generate the coordinate glcalllist (), glcalllists () // execution display list

The default value is counterclockwise (Gl_ccw) In the positive direction.GlfrontfaceTo specify the front of the element.

Sample Code:

void DrawMyObjects(void){  /* draw some points */  glBegin(GL_POINTS);    glColor3f(1.0,0.0,0.0);    glVertex2f(-10.0,11.0);    glColor3f(1.0,1.0,0.0);    glVertex2f(-9.0,10.0);    glColor3f(0.0,1.0,1.0);    glVertex2f(-8.0,12.0);  glEnd();  /* draw some line_segments */  glBegin(GL_LINES);    glColor3f(1.0,1.0,0.0);    glVertex2f(-11.0,8.0);    glVertex2f(-7.0,7.0);    glColor3f(1.0,0.0,1.0);    glVertex2f(-11.0,9.0);    glVertex2f(-8.0,6.0);  glEnd();  /* draw one opened_line */  glBegin(GL_LINE_STRIP);    glColor3f(0.0,1.0,0.0);    glVertex2f(-3.0,9.0);    glVertex2f(2.0,6.0);    glVertex2f(3.0,8.0);    glVertex2f(-2.5,6.5);  glEnd();  /* draw one closed_line */  glBegin(GL_LINE_LOOP);    glColor3f(0.0,1.0,1.0);    glVertex2f(7.0,7.0);    glVertex2f(8.0,8.0);    glVertex2f(9.0,6.5);    glVertex2f(10.3,7.5);    glVertex2f(11.5,6.0);    glVertex2f(7.5,6.0);  glEnd();  /* draw one filled_polygon */  glBegin(GL_POLYGON);    glColor3f(0.5,0.3,0.7);    glVertex2f(-7.0,2.0);    glVertex2f(-8.0,3.0);    glVertex2f(-10.3,0.5);    glVertex2f(-7.5,-2.0);    glVertex2f(-6.0,-1.0);  glEnd();  /* draw some filled_quandrangles */  glBegin(GL_QUADS);    glColor3f(0.7,0.5,0.2);    glVertex2f(0.0,2.0);    glVertex2f(-1.0,3.0);    glVertex2f(-3.3,0.5);    glVertex2f(-0.5,-1.0);    glColor3f(0.5,0.7,0.2);    glVertex2f(3.0,2.0);    glVertex2f(2.0,3.0);    glVertex2f(0.0,0.5);    glVertex2f(2.5,-1.0);  glEnd();  /* draw some filled_strip_quandrangles */  glBegin(GL_QUAD_STRIP);    glVertex2f(6.0,-2.0);    glVertex2f(5.5,1.0);    glVertex2f(8.0,-1.0);    glColor3f(0.8,0.0,0.0);    glVertex2f(9.0,2.0);    glVertex2f(11.0,-2.0);    glColor3f(0.0,0.0,0.8);    glVertex2f(11.0,2.0);    glVertex2f(13.0,-1.0);    glColor3f(0.0,0.8,0.0);    glVertex2f(14.0,1.0);  glEnd();  /* draw some filled_triangles */  glBegin(GL_TRIANGLES);    glColor3f(0.2,0.5,0.7);    glVertex2f(-10.0,-5.0);    glVertex2f(-12.3,-7.5);    glVertex2f(-8.5,-6.0);    glColor3f(0.2,0.7,0.5);    glVertex2f(-8.0,-7.0);    glVertex2f(-7.0,-4.5);    glVertex2f(-5.5,-9.0);  glEnd();  /* draw some filled_strip_triangles */  glBegin(GL_TRIANGLE_STRIP);    glVertex2f(-1.0,-8.0);    glVertex2f(-2.5,-5.0);    glColor3f(0.8,0.8,0.0);    glVertex2f(1.0,-7.0);    glColor3f(0.0,0.8,0.8);    glVertex2f(2.0,-4.0);    glColor3f(0.8,0.0,0.8);    glVertex2f(4.0,-6.0);  glEnd();  /* draw some filled_fan_triangles */  glBegin(GL_TRIANGLE_FAN);    glVertex2f(8.0,-6.0);    glVertex2f(10.0,-3.0);    glColor3f(0.8,0.2,0.5);    glVertex2f(12.5,-4.5);    glColor3f(0.2,0.5,0.8);    glVertex2f(13.0,-7.5);    glColor3f(0.8,0.5,0.2);    glVertex2f(10.5,-9.0);  glEnd();}

Point Size[Square] The back point of the reverse sample is a circle

void glPointSize(GLfloat size);

Line width

void glLineWidth(GLfloat width);

Draw line Glenable(Gl_line_stipple)

void glLineStipple(GLint factor, GLushort pattern);

Polygon Mode

Line frame mode:Glpolygonmode(Gl_front_and_back, gl_line );

void glPolygonMode(GLenum face, GLenum mode);

Polygon Removal Glenable(Gl_cull_face)

Remove the opposite:Glcullface(Gl_back );

void glCullFace(GLenum mode);

Point-drawn Polygon Glenable(Gl_polygon_stipple)

void glPolygonStipple(const GLubyte *mask);

Normal Vector

Normalization (high overhead)Glenable(Gl_normalize)

Uniform scaling NormalizationGlenable(Gl_rescale_normal)


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