CODEWITHSUNDEEP
c++openglglu
jie chen
jie chen

Reputation: 23

gluCylinder() doesn't draw the base and top

With OpenGL, I am trying to draw an arrow with cylinders(one cylinder and one cone). I used the gluCylinder() to draw a cylinder or cone. But the base and top of the cylinder is not visible. Can anyone tell me why?

Below is the code I used.

const double AXES_LEN = 300.0;
const double ARROW_LEN = 100.0;
const double ARROW_RADIUS = 30.0;

GLUquadricObj *objCylinder = gluNewQuadric();

glPushMatrix();
glColor3f(1.0f, 1.0f, 1.0f);
gluSphere(objCylinder, 15, 20, 20);
glPopMatrix();

glPushMatrix();
glColor3f(0.0f, 0.0f, 1.0f);
gluSphere(objCylinder, 0.25, 6, 6);
gluCylinder(objCylinder, 10, 10, AXES_LEN, 10, 5);            //z
//glTranslatef(0.0f, 0.0f, (GLfloat)AXES_LEN);
//gluCylinder(objCylinder, ARROW_RADIUS, 0, ARROW_LEN, 10, 5);  //blue arrow
glPopMatrix();

glPushMatrix();
glColor3f(0.0f, 1.0f, 0.0f);
glRotatef(-90, 1.0, 0.0, 0.0);
gluCylinder(objCylinder, 15, 15, AXES_LEN, 10, 5);             //Y North arrow
glTranslatef(0.0f, 0.0f, (GLfloat)AXES_LEN);
gluSphere(objCylinder, ARROW_RADIUS, 20, 20);
gluCylinder(objCylinder, ARROW_RADIUS*2, 2 , ARROW_LEN*2, 10, 5);   //green arrow
glPopMatrix();

glPushMatrix();
glColor3f(1.0f, 0.0f, 0.0f);
glRotatef(-90, 0.0, 1.0, 0.0);
gluCylinder(objCylinder, 10, 10, AXES_LEN, 10, 5);              //X
//glTranslatef(0.0f, 0.0f, (GLfloat)AXES_LEN);
//gluCylinder(objCylinder, ARROW_RADIUS, 0, ARROW_LEN, 10, 5);    //red arrow
glPopMatrix();

// RESTORE VIEW STATES
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();

Upvotes: 0

Views: 424

Answers (1)

fana
fana

Reputation: 1870

It seems that, because the gluCylinder is a function that draws only the side curved face.

If you want draw top and bottom faces, you may be able to use gludisk.

Upvotes: 3

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