http://www.dslreports.com/forum/OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-27997875 en Tue, 21 May 2013 11:54:16 EDT Tue, 21 May 2013 11:54:16 EDT http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-28001662 http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-28001662 Mon, 11 Feb 2013 20:26:49 EDT http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-28000987
My test program had GL_DEPTH_TEST enabled, which is probably not the case in your program since it defaults to off.]]> http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-28000987 Mon, 11 Feb 2013 16:53:03 EDT http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-28000751 http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-28000751 Mon, 11 Feb 2013 15:44:58 EDT http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-28000361
A couple ways to get around this:

1. Draw the smaller object (circle) first, then the ellipse.

or 2. Call glDepthFunc(GL_LEQUAL); once before you start any drawing. This will allow pixels at the same depth to be overwritten.]]> http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-28000361 Mon, 11 Feb 2013 14:04:05 EDT http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-28000121 http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-28000121 Mon, 11 Feb 2013 13:06:08 EDT http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-27999765 http://www.dslreports.com/forum/Re-OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-27999765 Mon, 11 Feb 2013 11:27:24 EDT http://www.dslreports.com/forum/OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-27997875
Also here be the code I'm using for the circle, like I said I thankfully have this working I'm just not sure what to change to make it an ellipse.

void drawFilledCircle(GLfloat x, GLfloat y, GLfloat radius){
int i;
int triangleAmount = 20; //# of triangles used to draw circle

//GLfloat radius = 0.8f; //radius
GLfloat twicePi = 2.0f * PI;

glBegin(GL_TRIANGLE_FAN);
glVertex2f(x, y); // center of circle
for(i = 0; i <= triangleAmount;i++) {
glVertex2f(
x + (radius * cos(i * twicePi / triangleAmount)),
y + (radius * sin(i * twicePi / triangleAmount))
);
}
glEnd();
glutSwapBuffers();
}

void myDisplay(void)
{

glClear(GL_COLOR_BUFFER_BIT);

drawFilledCircle(320,240,100);

glFlush();
}]]> http://www.dslreports.com/forum/OpenGL-ellipses-with-GLTRIANGLEFAN-Anyone-know-about-them-27997875 Sun, 10 Feb 2013 17:36:26 EDT