outline cube

void DrawCube(void)
{
static GLfloat wAngleX = 0.0f;

glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glPushMatrix();

glTranslatef(0.0f, 0.0f, 0.0f);
glRotatef(wAngleX, 0.0f, 1.0f, 0.0f);

wAngleX += 0.1f;

glBegin(GL_QUAD_STRIP);
	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.5f, 0.5f, 0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.5f, -0.5f, 0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(0.5f, 0.5f, 0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(0.5f, -0.5f, 0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(0.5f, 0.5f, -0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(0.5f, -0.5f, -0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.5f, 0.5f, -0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.5f, -0.5f,  -0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.5f, 0.5f, 0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.5f, -0.5f, 0.5f);
glEnd();

glBegin(GL_QUADS);
	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.5f, 0.5f, 0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(0.5f, 0.5f, 0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(0.5f, 0.5f, -0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.5f, 0.5f, -0.5f);
glEnd();

glBegin(GL_QUADS);
	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.5f, -0.5f, 0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(0.5f, -0.5f, 0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(0.5f, -0.5f, -0.5f);

	glColor3f(1.0f, 0.0f, 0.0f);
	glVertex3f(-0.5f, -0.5f,  -0.5f);
glEnd();

glPopMatrix();

glFinish();

glutSwapBuffers();

}

The above is part of my program to draw a red rotating cube.
Now, i am only able to see a solid red cube without its outline…
how can i edit the code to display the outline of the cube??
Pls help!!

If you mean drawing it as wireframe, then insert glPolygonMode(GL_FRONT_AND_BACK, GL_LINE) before drawing the cube. GL_FILL instead of GL_LINE will take you back to filled polygon rendering.

Ok…
Then how do i apply color to this wireframe now? i.e red cube with black wireframe…

i think you didn’t understand what glPolygonMode(GL_FRONT_AND_BACK, GL_LINE) does … it does NOT draw the wireframe and the filled cube at once … instead it draws the cube just as a wireframe object … if you want the wireframe to be green or something like that plus the solid red cube you need to render the cube twice using polygon offset …

the best is to look here :
http://www.opengl.org/developers/faqs/technical/polygonoffset.htm

if you draw the cube with the help of triangles you will se every line … but if you just want the lines on the edge of the cube to be seen use glEdgeFlag …

[This message has been edited by Sebbi (edited 12-01-2001).]