Sky Box 'Box'
Author
Im creating a box for my skybox, but my box seems to look all messed up... its going to be a (x) -50 to 50 (y) by -50 to 50 by (z) 0 to 50 box...
The code im using is.
void SkyView::renderSky() {
//glBindTexture(GL_TEXTURE_2D, 2004);
glBegin(GL_TRIANGLE_STRIP);
//Top face
glColor3f(1.0f, 1.0f, 1.0f);
glVertex3f(50.0f, 50.0f, 50.0f);
glVertex3f(-50.0f, 50.0f, 50.0f);
glVertex3f(-50.0f, 50.0f, -50.0f);
glVertex3f(50.0f, 50.0f, -50.0f);
//bottom face
glVertex3f(50.0f, 0.0f, 50.0f);
glVertex3f(-50.0f, 0.0f, 50.0f);
glVertex3f(50.0f, 0.0f, -50.0f);
glVertex3f(-50.0f, 0.0f, -50.0f);
//Front face
glColor3f(0.0f, 1.0f, 0.0f);
glVertex3f(50.0f, 50.0f, -50.0f);
glVertex3f(-50.0f, 50.0f, -50.0f);
glVertex3f(50.0f, 0.0f, -50.0f);
glVertex3f(-50.0f, 0.0f, -50.0f);
//Back face
glColor3f(1.0f, 0.0f, 0.0f);
glVertex3f(50.0f, 50.0f, 50.0f);
glVertex3f(-50.0f, 50.0f, 50.0f);
glVertex3f(-50.0f, 0.0f, 50.0f);
glVertex3f(50.0f, 0.0f, 50.0f);
//Left face
glVertex3f(-50.0f, 50.0f, 50.0f);
glVertex3f(-50.0f, 50.0f, -50.0f);
glVertex3f(-50.0f, 0.0f, -50.0f);
glVertex3f(-50.0f, 0.0f, 50.0f);
//Right face
glVertex3f(50.0f, 50.0f, 50.0f);
glVertex3f(50.0f, 50.0f, -50.0f);
glVertex3f(50.0f, 0.0f, -50.0f);
glVertex3f(50.0f, 0.0f, 50.0f);
glEnd();
Any ideas? thank you
FIRSTLY, why is the box so big? a two-unit box shows up exactly the same. Did you forget to disable depth testing? How exactly is it ''messed up''?
even before FIRSTLY!
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Why are you using a triangle strip if they''re quads?
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how does it look exactly? all white I would be guessing, also... you aren''t specifying any texture coordinates.
The fault you made is that you used tri strips.
They depend on the last two written vertexes and therefore will mess things up big time, use quads.
So, to help you out a little, here is the skybox rendering function i use.
cam.p cam.h cam.b are xyz camera rotations in degrees, replace as needed.
unsigned int skyboxtex[6]; is the texture reference, replace if needed.
the skybox textures should be loaded with these setting's.
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);
---------------------------------
For an overdose of l33tness, flashbang.nu
[edited by - lc_overlord on March 5, 2004 6:02:54 PM]
They depend on the last two written vertexes and therefore will mess things up big time, use quads.
So, to help you out a little, here is the skybox rendering function i use.
cam.p cam.h cam.b are xyz camera rotations in degrees, replace as needed.
unsigned int skyboxtex[6]; is the texture reference, replace if needed.
void draw::rendersky(void){ glDisable(GL_CULL_FACE); glPushMatrix(); glDisable(GL_DEPTH_TEST); glDisable(GL_LIGHTING); glLoadIdentity(); // Reset The Current Modelview Matrix glRotated(-cam.p,1,0,0); glRotated(-cam.h,0,1,0); glRotated(-cam.b,0,0,1); glEnable( GL_TEXTURE_2D ); glBindTexture( GL_TEXTURE_2D, skyboxtex[1]); //sets the current skin glBegin(GL_QUADS); // Begin Drawing Quads // Floor glNormal3f(0.0f, 1.0f, 0.0f); // Normal Pointing Up glTexCoord2f(1,0); glVertex3f(-10.0f,-10.0f,-10.0f); // Back Left glTexCoord2f(1,1); glVertex3f(-10.0f,-10.0f, 10.0f); // Front Left glTexCoord2f(0,1); glVertex3f( 10.0f,-10.0f, 10.0f); // Front Right glTexCoord2f(0,0); glVertex3f( 10.0f,-10.0f,-10.0f); // Back Right glEnd(); glBindTexture( GL_TEXTURE_2D, skyboxtex[0]); //sets the current skin glBegin(GL_QUADS); // Ceiling glNormal3f(0.0f,-1.0f, 0.0f); // Normal Point Down glTexCoord2f(1,0); glVertex3f(-10.0f, 10.0f, 10.0f); // Front Left glTexCoord2f(1,1); glVertex3f(-10.0f, 10.0f,-10.0f); // Back Left glTexCoord2f(0,1); glVertex3f( 10.0f, 10.0f,-10.0f); // Back Right glTexCoord2f(0,0); glVertex3f( 10.0f, 10.0f, 10.0f); // Front Right glEnd(); glBindTexture( GL_TEXTURE_2D, skyboxtex[2]); //sets the current skin glBegin(GL_QUADS); // Front Wall glNormal3f(0.0f, 0.0f, 1.0f); // Normal Pointing Away From Viewer glTexCoord2f(0,1); glVertex3f(-10.0f, 10.0f,-10.0f); // Top Left glTexCoord2f(0,0); glVertex3f(-10.0f,-10.0f,-10.0f); // Bottom Left glTexCoord2f(1,0); glVertex3f( 10.0f,-10.0f,-10.0f); // Bottom Right glTexCoord2f(1,1); glVertex3f( 10.0f, 10.0f,-10.0f); // Top Right glEnd(); glBindTexture( GL_TEXTURE_2D, skyboxtex[3]); //sets the current skin glBegin(GL_QUADS); // Back Wall glNormal3f(0.0f, 0.0f,-1.0f); // Normal Pointing Towards Viewer glTexCoord2f(0,1); glVertex3f( 10.0f, 10.0f, 10.0f); // Top Right glTexCoord2f(0,0); glVertex3f( 10.0f,-10.0f, 10.0f); // Bottom Right glTexCoord2f(1,0); glVertex3f(-10.0f,-10.0f, 10.0f); // Bottom Left glTexCoord2f(1,1); glVertex3f(-10.0f, 10.0f, 10.0f); // Top Left glEnd(); glBindTexture( GL_TEXTURE_2D, skyboxtex[4]); //sets the current skin glBegin(GL_QUADS); // Left Wall glNormal3f(1.0f, 0.0f, 0.0f); // Normal Pointing Right glTexCoord2f(0,1); glVertex3f(-10.0f, 10.0f, 10.0f); // Top Front glTexCoord2f(0,0); glVertex3f(-10.0f,-10.0f, 10.0f); // Bottom Front glTexCoord2f(1,0); glVertex3f(-10.0f,-10.0f,-10.0f); // Bottom Back glTexCoord2f(1,1); glVertex3f(-10.0f, 10.0f,-10.0f); // Top Back glEnd(); glBindTexture( GL_TEXTURE_2D, skyboxtex[5]); //sets the current skin glBegin(GL_QUADS); // Right Wall glNormal3f(-1.0f, 0.0f, 0.0f); // Normal Pointing Left glTexCoord2f(0,1); glVertex3f( 10.0f, 10.0f,-10.0f); // Top Back glTexCoord2f(0,0); glVertex3f( 10.0f,-10.0f,-10.0f); // Bottom Back glTexCoord2f(1,0); glVertex3f( 10.0f,-10.0f, 10.0f); // Bottom Front glTexCoord2f(01,1); glVertex3f( 10.0f, 10.0f, 10.0f); // Top Front glEnd(); // Done Drawing Quads glPopMatrix(); glEnable(GL_DEPTH_TEST); glEnable(GL_CULL_FACE); }the skybox textures should be loaded with these setting's.
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP);
---------------------------------
For an overdose of l33tness, flashbang.nu
[edited by - lc_overlord on March 5, 2004 6:02:54 PM]
here is co-ords for a skybox using triangles
//Format X,Y,Z ,U,V
//Where to tris make up one quad it is the same side -- duh
// Skybox
// Front
TEXTURE=6
-40.0 -40.0 -40.0 0.0 0.0
-40.0 40.0 -40.0 0.0 1.0
40.0 40.0 -40.0 1.0 1.0
TEXTURE=6
40.0 40.0 -40.0 1.0 1.0
40.0 -40.0 -40.0 1.0 0.0
-40.0 -40.0 -40.0 0.0 0.0
// Right
TEXTURE=9
40.0 -40.0 -40.0 0.0 0.0
40.0 40.0 -40.0 0.0 1.0
40.0 40.0 40.0 1.0 1.0
TEXTURE=9
40.0 40.0 40.0 1.0 1.0
40.0 -40.0 40.0 1.0 0.0
40.0 -40.0 -40.0 0.0 0.0
// Back
TEXTURE=8
-40.0 -40.0 40.0 1.0 0.0
-40.0 40.0 40.0 1.0 1.0
40.0 40.0 40.0 0.0 1.0
TEXTURE=8
40.0 40.0 40.0 0.0 1.0
40.0 -40.0 40.0 0.0 0.0
-40.0 -40.0 40.0 1.0 0.0
// Left
TEXTURE=7
-40.0 -40.0 -40.0 1.0 0.0
-40.0 40.0 -40.0 1.0 1.0
-40.0 40.0 40.0 0.0 1.0
TEXTURE=7
-40.0 40.0 40.0 0.0 1.0
-40.0 -40.0 40.0 0.0 0.0
-40.0 -40.0 -40.0 1.0 0.0
// Bottom
TEXTURE=11
-40.0 -40.0 -40.0 0.0 0.0
40.0 -40.0 -40.0 0.0 1.0
40.0 -40.0 40.0 1.0 1.0
TEXTURE=11
40.0 -40.0 40.0 1.0 1.0
-40.0 -40.0 40.0 1.0 0.0
-40.0 -40.0 -40.0 0.0 0.0
// Top
TEXTURE=10
-40.0 40.0 -40.0 0.0 1.0
40.0 40.0 -40.0 0.0 0.0
40.0 40.0 40.0 1.0 0.0
TEXTURE=10
40.0 40.0 40.0 1.0 0.0
-40.0 40.0 40.0 1.0 1.0
-40.0 40.0 -40.0 0.0 1.0
//Format X,Y,Z ,U,V
//Where to tris make up one quad it is the same side -- duh
// Skybox
// Front
TEXTURE=6
-40.0 -40.0 -40.0 0.0 0.0
-40.0 40.0 -40.0 0.0 1.0
40.0 40.0 -40.0 1.0 1.0
TEXTURE=6
40.0 40.0 -40.0 1.0 1.0
40.0 -40.0 -40.0 1.0 0.0
-40.0 -40.0 -40.0 0.0 0.0
// Right
TEXTURE=9
40.0 -40.0 -40.0 0.0 0.0
40.0 40.0 -40.0 0.0 1.0
40.0 40.0 40.0 1.0 1.0
TEXTURE=9
40.0 40.0 40.0 1.0 1.0
40.0 -40.0 40.0 1.0 0.0
40.0 -40.0 -40.0 0.0 0.0
// Back
TEXTURE=8
-40.0 -40.0 40.0 1.0 0.0
-40.0 40.0 40.0 1.0 1.0
40.0 40.0 40.0 0.0 1.0
TEXTURE=8
40.0 40.0 40.0 0.0 1.0
40.0 -40.0 40.0 0.0 0.0
-40.0 -40.0 40.0 1.0 0.0
// Left
TEXTURE=7
-40.0 -40.0 -40.0 1.0 0.0
-40.0 40.0 -40.0 1.0 1.0
-40.0 40.0 40.0 0.0 1.0
TEXTURE=7
-40.0 40.0 40.0 0.0 1.0
-40.0 -40.0 40.0 0.0 0.0
-40.0 -40.0 -40.0 1.0 0.0
// Bottom
TEXTURE=11
-40.0 -40.0 -40.0 0.0 0.0
40.0 -40.0 -40.0 0.0 1.0
40.0 -40.0 40.0 1.0 1.0
TEXTURE=11
40.0 -40.0 40.0 1.0 1.0
-40.0 -40.0 40.0 1.0 0.0
-40.0 -40.0 -40.0 0.0 0.0
// Top
TEXTURE=10
-40.0 40.0 -40.0 0.0 1.0
40.0 40.0 -40.0 0.0 0.0
40.0 40.0 40.0 1.0 0.0
TEXTURE=10
40.0 40.0 40.0 1.0 0.0
-40.0 40.0 40.0 1.0 1.0
-40.0 40.0 -40.0 0.0 1.0
Author
Hi, yeah sorry i didnt realise i used GL_TRIANGLE_STRIP for it.. I quickly changed it too polygon, but this didnt make much difference. The box was ok for the front face and left face but it had diaganols running all over on the other faces. Thanks for that code im gonna give it go now!
Ill keep you posted on how it goes!
Thanks
Ill keep you posted on how it goes!
Thanks
Author
Doh I''m an Idiot! Yeah it was a case of just changin it too GL_QUADS, i was thinking the GL_POLYGON was the way you did it... anyways thanks again!
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