I've been reading the forums for things related to skybox's and am still missing a few important pieces. I read that I should disable the depth buffer to make the skybox big and all surrounding (for lack of a better description that will have to work). I'm just not sure the exact code for that. Also I would need to reaarange the way my quad is drawn right (flip from front to back)? So that the textures are facing the inside of the cube? glBindTexture(GL_TEXTURE_2D, texture[0]); glBegin(GL_QUADS); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); glEnd(); this is an example of one side of my cube. thanks in advance. -db jeff@hype52.com www.pricezapper.com Edited by - deadbeat on April 13, 2001 3:21:12 AM

That''s one method of doing it...
To disable the depth testing just disable GL_DEPTH_TEST.
And yes, the vertex order would have to be reversed!

okie it works. but now it's being weird (it was doing this before).
pieces are getting cut off? its weird..

pic showing what i mean

my draw function code (based on a slightly modified nehes new base + stolen stuff from lesson 10/23):

    	glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	// Clear Screen And Depth Buffer	glLoadIdentity ();										// Reset The Modelview Matrix	//GLfloat x_m, y_m, z_m, u_m, v_m;						// Floating Point For Temp X, Y, Z, U And V Vertices	GLfloat xtrans = -xpos;									// Used For Player Translation On The X Axis	GLfloat ztrans = -zpos;									// Used For Player Translation On The Z Axis	GLfloat ytrans = -walkbias-0.25f;						// Used For Bouncing Motion Up And Down	GLfloat sceneroty = 360.0f - yrot;						// 360 Degree Angle For Player Direction//	int numtriangles;										// Integer To Hold The Number Of Triangles	glRotatef(lookupdown,1.0f,0,0);							// Rotate Up And Down To Look Up And Down	glRotatef(sceneroty,0,1.0f,0);							// Rotate Depending On Direction Player Is Facing		glTranslatef(xtrans, ytrans, ztrans);					// Translate The Scene Based On Player Position	// Front Face	glDisable(GL_DEPTH_TEST);										// Enable Depth Testing	glEnable(GL_CLAMP);	glBindTexture(GL_TEXTURE_2D, texture[0]);						// Bind texture	glBegin(GL_QUADS);		glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);	// Top Left Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);	// Top Right Of The Texture and Quad		glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);	// Bottom Right Of The Texture and Quad		glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);	// Bottom Left Of The Texture and Quad	glEnd();	// Back Face	glBindTexture(GL_TEXTURE_2D, texture[1]);						// Bind texture	glBegin(GL_QUADS);		glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);	// Bottom Left Of The Texture and Quad		glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);	// Top Left Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);	// Top Right Of The Texture and Quad		glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);	// Bottom Right Of The Texture and Quad	glEnd();	// Top Face	glBindTexture(GL_TEXTURE_2D, texture[2]);					// Bind texture	glBegin(GL_QUADS);		glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f,  1.0f, -1.0f);	// Top Left Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);	// Bottom Left Of The Texture and Quad		glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);	// Bottom Right Of The Texture and Quad		glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f,  1.0f, -1.0f);	// Top Right Of The Texture and Quad	glEnd();	// Bottom Face	glBindTexture(GL_TEXTURE_2D, texture[3]);					// Bind texture	glBegin(GL_QUADS);		glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);	// Bottom Right Of The Texture and Quad		glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);	// Bottom Left Of The Texture and Quad		glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);	// Top Left Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);	// Top Right Of The Texture and Quad	glEnd();	// Left Face	glBindTexture(GL_TEXTURE_2D, texture[4]);					// Bind texture	glBegin(GL_QUADS);		glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);	// Top Left Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);	// Top Right Of The Texture and Quad		glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);	// Bottom Right Of The Texture and Quad		glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);	// Bottom Left Of The Texture and Quad	glEnd();	// Right face	glBindTexture(GL_TEXTURE_2D, texture[5]);					// Bind texture	glBegin(GL_QUADS);		glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);	// Bottom Left Of The Texture and Quad		glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);	// Top Left Of The Texture and Quad		glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);	// Top Right Of The Texture and Quad		glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);	// Bottom Right Of The Texture and Quad	glEnd();	glDisable(GL_CLAMP);	glEnable(GL_DEPTH_TEST);											// Enable Depth Testing}    

on a side note what does glFlush() do?

edit: sorry code space is so big and ugly.

-db
jeff@hype52.com
www.pricezapper.com

Edited by - deadbeat on April 13, 2001 3:24:20 AM

the vertices have to be in the near<->far depth buffer range

make your near buffer 0.1 and far 100000 (then slowly bringing them closer until you dont clip objects in your scene


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Try removing the enable/disable of GL_CLAMP I don''t think you need that in there anyway.

glFlush tells the driver to execute all commands it''s got in it''s various buffers. i.e. just because you ran through a loop to draw a series of quads dosn''t neccisarryly mean that they''ve already been drawn. glFlush tells the driver to execute all commands before continuing.

thank you both for your responses. zedzeek could you go into a little bit more detail, *please*? its not gl_clamp......

source code -if anyone wants to look (its 800k cuz of skybox images)

any more suggestions greatly appreciated.

-db
jeff@hype52.com
www.pricezapper.com

This has noting to do with your clipping problem, but as for clamping, set the wrapping parameter of your skybox texture objects to GL_CLAMP, that's the correct way to do it :

//should ideally be done at texture object creation time
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);

At least that's the way I'm doing it.

Edited by - /*Vince*/ on April 14, 2001 3:53:15 PM

make your near clip plane smaller like so.

void ReshapeGL (int width, int height)
{

gluPerspective (45.0f, (GLfloat)(width)/(GLfloat)(height), 0.1f, 100.0f);

}

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thank you!!!

-db
jeff@hype52.com
www.pricezapper.com