Texture coord problem...

[M109uk]

Hi all,

I have yet another problem...
I have a simple quad, and i want to bind a texture to it.. nice and simple..
[pascal]
Textures.Bind('Path1');
glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex3f(0, 0.1, 12;

glTexCoord2f(1, 0);
glVertex3f(64, 0.1, 12;

glTexCoord2f(1, 1);
glVertex3f(64, 0.1, 192);

glTexCoord2f(0, 1);
glVertex3f(0, 0.1, 192);
glEnd;
[/pascal]

how ever instead of the texture turning out like:


it turns out like:


Iv messed around with the texture coords and the only result that i get is with:
0, 0
1, 0
0, 1
-1, 1

But this messes the edges of my textures up..

Im not sure if its the way OpenGL draws quads, but it seems to render as a 2 triangles..

Is there any OpenGL function that will cause this kinda thing??

[JSoftware]

try to load identity matrix into gl_texture matrix..

i've no ide if that may be the problem but the texture matrix can screw somethings up.

the code shows just fine when i fire it up in my engine

EDIT: if this doesn't solve it just switch the two texcoords in the middle so it becomes:

0,0
1,1
1,0
0,1

[M109uk]

Ok, i think i have done it right:
[pascal]
glMatrixMode(GL_TEXTURE);
glLoadIdentity;
glMatrixMode(GL_MODELVIEW);
[/pascal]
If so then it has no effect :s

I tried your tex coords, but that doesnt solve it either, it turns out worse

[JSoftware]

that's pretty weird-- :?

have you tried:

0,0
1,0
0,1
1,1

if you're not able to get it right when altering the texcoords like this then i would bet that your bmp laoder code is the problem

[M109uk]

I have no idea why its happening, im not accessing the texture matrix in any way, im creating new textures on the fly when i generate my terrain..

I am positive its not my texture loading, i have saved that particular texture in BMP,JPG,PNG and TGA and the same problem occours.. and i dont have the same problem in any of my other applications that use the textures.. I also have a function built in to extract a TBitmap from the texture (using the loaded data) and that looks right too...

I tried those coords too, and i had a similar effect as before...

I have a little maths involved when calculating where the tiles are in the terrain...
[pascal]
For i := 0 to 256-1 Do
For j := 0 To 256-1 Do
Begin
v1 := Vertex3f((64*i), 0, (64*j));
v2 := Vertex3f((64*i)+64, 0, (64*j));
v3 := Vertex3f((64*i)+64, 0, (64*j)+64);
v4 := Vertex3f((64*i), 0, (64*j)+64);

// Bind texture
glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex3fv(@v1);

glTexCoord2f(1, 0);
glVertex3fv(@v1);

glTexCoord2f(1, 1);
glVertex3fv(@v3);

glTexCoord2f(0, 1);
glVertex3fv(@v4);
glEnd;
[/pascal]
I am fairly sure this gives the correct coords, and i am assuming that it shouldnt effect the texture coords?!?
Maybe i have the maths the wrong way around??

[M109uk]

Ok i have solved it, was a really stupid mistake on my part..
It was the texture file itself it was supposed to be 128x128 but it was actually 119x119 :roll:

Thanx for your help

[JSoftware]

hehe no problem. i've done precisely the same thing some time ago but i just couldn't remember what i did to solve it!