32 replies to this topic

[urika]

i loaded a 3ds object into my program , i managed to load the texture as well but not as i mapped it in 3d studio max 5
the "preserve max's texture coordinates" is checked but still it kinda puts the jpg on the object without mapping
can anyone help?

[anubis]

well, without seeing any code it's hard to help you

[urika]

its basicly the 3ds loader from gametutorials (that can also read jpeg)
i changed the 3ds object to mine.
i can post code but since i dont know where the problem is i dont really know what to post :blush:
while i m looking 4 a solution myself i came across glTexCoordPointer
does this have something to do with it (or something like it)?

[anubis]

well, if you pass glTexCoordPointer the texture coordiantes from your max file i don't know why it doesn't work. it looks like some small bug in your code... which i can't fix for you ;)

[urika]

i did not use glTexCoordPointer yet!
i just saw it in the msdn help as i was looking for a solution.
can anyone post some code with glTexCoordPointer?
or just tell me where i can find something helpful.. :nod:

[anubis]

try to find out about opengl vertex buffers. you might want to google for the "opengl red book"

[urika]

here is some code that i think should texture correctly but doesnt
if(pObject->bHasTexture)
{

// Make sure there was a UVW map applied to the object or else it won't have tex coords.
if(pObject->pTexVerts)
{
glTexCoord2f(pObject->pTexVerts[ index ].x, pObject->pTexVerts[ index ].y);
}
}


i assume the info in pTexVerts is correct but still it doesnt texturize correctly

[urika]

after working on it and changing the order of things , the texture appears on the object but not as in 3d studio max, why ????? is there something in max that i need to change? :blink:

[davepermen]

how "different"? mirrored or what?

i don't know. we never had such problems, it... just worked.. :|

[urika]

first of all thanks for trying.
my object is a jet fighter, in max i put a texture using unwrap uvw so it would look lifelike.
when i use the object in opengl , it uses the same jpg allright but the coordinates have moved , for instance the back fin texture is smeared on the wing.
i don't know WHERE the problem is openGL? Max?(it looks good in max) :eek:

[davepermen]

hm.. comparison pics (hint: my webspace for hosting), or actual loading code could help i guess.. difficult without any info on WHAT is wrong, or HOW its wrong..

[urika]

it works!!!!
the problem was this:
there was glTexCoord2f(pObject->pTexVerts[ind].x, pObject->pTexVerts[ind].y);
and when i changed it to
glTexCoord2f(pObject->pTexVerts[ind].x, -pObject->pTexVerts[ind].y);
it works (the "-" made the differance).
i dont exactly understand why...
can any one enlighten me? B)

[anubis]

max has strange ways of dealing with coordinates in general... y - z axis mixed up, etc. i wouldn't know y it should store negative texture coordinates. also i never had that problem...

[davepermen]

hm... very weird.. what format is the texture? and what do you use to load it?

because some images are known to be stored "topdown" => you have to flip the y-coord (actually you have to calc 1-ycoord, but if you have GL_REPEAT, result is the same..)

[anubis]

hey... that might be the solution... why didn't i think of that ???
i bet he's using targas for textures...

[urika]

the texture format is jpg , i dont know what is "targas".
my loader is basically from gametutorials.com

[baldurk]

The Targa image format is quite common. The file extension is generally .tga

[anubis]

and very often they are stored upside-down

[urika]

nope, jpg

[davepermen]

well, all i know is jpg and bmp are upsidedown with relation to eachother.. i always "loved" that in DevIL.. but you could set there a mode to lode in the correct orientation..

i guess its that.. flip your jpgs..