Clipping plane prob?

**gazsux** · 07-04-2003

Grr, i have some odd problem and i'm not quite sure of the reason why. I'm not even sure if its my programming or a prob with my graphics card. It should be easy, this isnt even the thing im trying to program :|.

All i have is a 50x50 flat plane going along the x,z axis. However, for some reason it doesn't show all of it.

Look at:
http://www.dougfur.com/planeprob.jpg

As you can see the plane gets cut off at what look like an imposed near and far clipping plane, yet im not clipping anything. So if should be whatever the OpenGL defaults are. The plane should stretch of into the distance, but it doesnt. Each square is 1x1 in size so you can see it should go beyond the screen. When i move around the same horizontal lines block any more of the view showing.

I know it's pretty random but has any got any ideas? is it me or is it some setting i can change on my graphics card?

Grr again.

**gazsux** · 07-04-2003

bah... just found another program i can test it on and it works fine... must be my code.... very odd. Maybe a depth buffer problem?

**Perspective** · 07-04-2003

can you post the code where you initialize your openGL settings?

**gazsux** · 07-04-2003

Code:

int main()
{
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH | GLUT_RGB);  // Setup the window
glutInitWindowSize(SCALE, SCALE);  
glutInitWindowPosition(100, 100);  
glutCreateWindow("Base Code v1.0"); 

BCConfigureScene();

glutDisplayFunc(display);					 // Display callback
glutKeyboardFunc(keyboard);					 // Keyboard user input callback 

glutMainLoop();

BCShutDown(0);
	
return EXIT_SUCCESS;
}

void BCConfigureScene()
{
int iErrorCheck;
int static iNameCounter=0;
float LightAmbient[4]= {0.35f, 0.35f, 0.35f, 1.00f};	// Lighting
float LightDiffuse[4]= {1.00f, 1.00f, 1.00f, 1.00f};
float LightPosition[4]={0.00f, 1.00f, 0.00f, 1.00f};
float LightPosition1[4]={2.00f, 1.00f, 0.00f, 0.00f};
float MattSpecular[4]= {0.00f, 0.00f, 0.00f, 1.00f};	// Material properties
float MattShininess[4]={0.0f};

BCLookAt(0.00f, 0.50f, -5.00f, 0.00f, 0.00f, 0.00f, 0, 1, 0);	// Starting cam/view position

glClearColor(0.60f, 0.60f, 0.60f, 1.00f);
glShadeModel(GL_SMOOTH);
glEnable(GL_DEPTH_TEST);									// Enables depth testing
glCullFace(GL_BACK);
glEnable(GL_CULL_FACE);										// Enables back face culling

glLightfv(GL_LIGHT0, GL_AMBIENT, LightAmbient);				// Setup the ambient light
glLightfv(GL_LIGHT0, GL_DIFFUSE, LightDiffuse);				// Setup the diffuse light
glLightfv(GL_LIGHT0, GL_POSITION,LightPosition);			// Position the light
glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient);	
glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse);	
glLightfv(GL_LIGHT1, GL_POSITION,LightPosition1);
glMaterialfv(GL_FRONT, GL_SPECULAR, MattSpecular);			// Set material properties
glMaterialfv(GL_FRONT, GL_SHININESS, MattShininess);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHT1);

return;
}

**MrWizard** · 07-04-2003

Where do you set your projection matrix and the view matrix? Are you sure you don't have your near and far clipping planes very close together? Thats what it looks like to me.

**Perspective** · 07-04-2003

hmmm, ive never used GLUT before. are you clearing the depth buffer in your draw routine?

void draw()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
...etc

}

**gazsux** · 07-04-2003

Where do you set your projection matrix and the view matrix?

I don't. where should i set them?

are you clearing the depth buffer in your draw routine?

Yep i am.

Are you sure you don't have your near and far clipping planes very close together?

Thats what i think, but i haven't set any planes myself. It should be set to whatever the OpenGL presets are.

**~~frenchfry164~~** · 07-04-2003

OpenGL presets it pretty small. You should set your viewing distance with gluPerspective(). It goes into the projection matrix.

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