hello again,

 I'm loading a 3d object from a .3ds file. I'm doing it successfully so I
can see over the marker my object. The problem is that I'm also loading the
texture (a .bmp file) for that object and when drawing the object I go thru
this two lines (more or less )for rendering the texture :
glEnable(GL_TEXTURE_2D) and glBindTexture( GL_TEXTURE_2D, ID), where ID is
the identification of the texture.....but....... this is not working!!!

I've been surfing on the web and I could find some examples for mapping
textures using OpenGl and actually I could get an example to work==> this
just create a regular window, load the 3d object, apply lights and
render....sooo, this is making me think that there must be some option when
drawing the video frame or even when creating the window that disable the
texture for the object.....did anyone try it before?? I don't know too much
about OpenGl so....I don't know where in the whole code I have to look for,
please help!!!!

BSS schrieb:
> hello again,

Hi,

>  I'm loading a 3d object from a .3ds file. I'm doing it successfully so I
> can see over the marker my object. The problem is that I'm also loading the
> texture (a .bmp file) for that object and when drawing the object I go thru
> this two lines (more or less )for rendering the texture :
> glEnable(GL_TEXTURE_2D) and glBindTexture( GL_TEXTURE_2D, ID), where ID is
> the identification of the texture.....but....... this is not working!!!
> I've been surfing on the web and I could find some examples for mapping
> textures using OpenGl and actually I could get an example to work==> this
> just create a regular window, load the 3d object, apply lights and
> render....sooo, this is making me think that there must be some option when
> drawing the video frame or even when creating the window that disable the
> texture for the object.....did anyone try it before?? I don't know too much
> about OpenGl so....I don't know where in the whole code I have to look for,
> please help!!!!

Hm, is your texture size (height and width, not filesize) a power of 2? 
(128x128, 256x256, 512x512, etc.)
If not, then that might be your problem. OpenGL usually requires 
textures to have a width and height which is a power of 2...
By the way, you can find several good OpenGL tutorials at:
   http://nehe.gamedev.net
(that site has nothing to do with augmented reality, but you can find 
examples for many OpenGL related topics there...)

Hope I could help,
   Robert

thanks robert, but when I load the same object and the same texture in the
example I can get to work, I can see it, so.... It must be any other stuff.
By the way, right now I'm loading a simple sphere with a regular picture as
texture..so I don't know what is wrong  when I try to do it in my
application.
any other clues?

Begona.-

-----Mensaje original-----
De: owner-artoolkit@h ..................
[mailto:owner-artoolkit@h ..................]En nombre de Robert Hinn
Enviado el: miercoles, 19 de mayo de 2004 23:35
CC: artoolkit@h ..................
Asunto: Re: I need to aply a texture to my 3D object


BSS schrieb:
> hello again,

Hi,

>  I'm loading a 3d object from a .3ds file. I'm doing it successfully so I
> can see over the marker my object. The problem is that I'm also loading
the
> texture (a .bmp file) for that object and when drawing the object I go
thru
> this two lines (more or less )for rendering the texture :
> glEnable(GL_TEXTURE_2D) and glBindTexture( GL_TEXTURE_2D, ID), where ID is
> the identification of the texture.....but....... this is not working!!!
> I've been surfing on the web and I could find some examples for mapping
> textures using OpenGl and actually I could get an example to work==> this
> just create a regular window, load the 3d object, apply lights and
> render....sooo, this is making me think that there must be some option
when
> drawing the video frame or even when creating the window that disable the
> texture for the object.....did anyone try it before?? I don't know too
much
> about OpenGl so....I don't know where in the whole code I have to look
for,
> please help!!!!

Hm, is your texture size (height and width, not filesize) a power of 2?
(128x128, 256x256, 512x512, etc.)
If not, then that might be your problem. OpenGL usually requires
textures to have a width and height which is a power of 2...
By the way, you can find several good OpenGL tutorials at:
   http://nehe.gamedev.net
(that site has nothing to do with augmented reality, but you can find
examples for many OpenGL related topics there...)

Hope I could help,
   Robert

BSS schrieb:
> thanks robert, but when I load the same object and the same texture in the
> example I can get to work, I can see it, so.... It must be any other stuff.
> By the way, right now I'm loading a simple sphere with a regular picture as
> texture..so I don't know what is wrong  when I try to do it in my
> application.
> any other clues?

Well, I just tried some simple texture mapping in the simpleTest example 
that comes with ARToolKit and it seems to work. Maybe you can just check 
if your texture works with a simple polygon before trying to apply it to 
your .3ds object, e.g.: (instead of "glutSolidCube(50.0);" in the 
"draw()" function in "simple.c")

   glEnable( GL_TEXTURE_2D );
   glBindTexture( GL_TEXTURE_2D, texture[0] );
   glTexImage2D( GL_TEXTURE_2D, 0, 3, textureWidth, textureHeight, 0, 
GL_RGB, GL_UNSIGNED_BYTE, textureData );
   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
   glBegin( GL_POLYGON );
   glVertex3f( -25.0f, -25.0f, 0.0f );
   glTexCoord2f( 0.0f, 0.0f );
   glVertex3f(  25.0f, -25.0f, 0.0f );
   glTexCoord2f( 1.0f, 0.0f );
   glVertex3f(  25.0f,  25.0f, 0.0f );
   glTexCoord2f( 1.0f, 1.0f );
   glVertex3f( -25.0f,  25.0f, 0.0f );
   glTexCoord2f( 0.0f, 1.0f );
   glEnd();

That way you can make sure that your texture works. There could be 
several reasons why your texture isn't working, e.g.:
- your texture width and height are not a power of 2 and your example 
program uses a workaround (e.g. internally using a larger texture (like 
1024x1024), copying your image into it and then using texture 
coordinates to only select the part of the large texture with your image 
in it... this is a popular trick for using textures that have an invalid 
size)
- your .3ds object doesn't set texture coordinates (the glTexCoord2f() 
calls in the above code tell OpenGL which point of the texture image 
corresponds to which object vertex)

I haven't worked with .3ds objects, yet (at least not directly with 
OpenGL)...

Cheers,
   Robert


> Begona.-
> 
> -----Mensaje original-----
> De: owner-artoolkit@h ..................
> [mailto:owner-artoolkit@h ..................]En nombre de Robert Hinn
> Enviado el: miercoles, 19 de mayo de 2004 23:35
> CC: artoolkit@h ..................
> Asunto: Re: I need to aply a texture to my 3D object
> 
> 
> BSS schrieb:
> 
>>hello again,
> 
> 
> Hi,
> 
> 
>> I'm loading a 3d object from a .3ds file. I'm doing it successfully so I
>>can see over the marker my object. The problem is that I'm also loading
> 
> the
> 
>>texture (a .bmp file) for that object and when drawing the object I go
> 
> thru
> 
>>this two lines (more or less )for rendering the texture :
>>glEnable(GL_TEXTURE_2D) and glBindTexture( GL_TEXTURE_2D, ID), where ID is
>>the identification of the texture.....but....... this is not working!!!
>>I've been surfing on the web and I could find some examples for mapping
>>textures using OpenGl and actually I could get an example to work==> this
>>just create a regular window, load the 3d object, apply lights and
>>render....sooo, this is making me think that there must be some option
> 
> when
> 
>>drawing the video frame or even when creating the window that disable the
>>texture for the object.....did anyone try it before?? I don't know too
> 
> much
> 
>>about OpenGl so....I don't know where in the whole code I have to look
> 
> for,
> 
>>please help!!!!
> 
> 
> Hm, is your texture size (height and width, not filesize) a power of 2?
> (128x128, 256x256, 512x512, etc.)
> If not, then that might be your problem. OpenGL usually requires
> textures to have a width and height which is a power of 2...
> By the way, you can find several good OpenGL tutorials at:
>    http://nehe.gamedev.net
> (that site has nothing to do with augmented reality, but you can find
> examples for many OpenGL related topics there...)
> 
> Hope I could help,
>    Robert
> 
> 

guys!!!!! don't know why but this thing suddenly worked !!!!

well, I just discover I was loading the texture before creating the window,
a fact I didn't think was so important...uppsss

now, I'm able to see the texture in the simple sphere...so my challenge will
be mapping different textures in a virtual laboratory I have made using 3ds
max. wish me luck!!! otherwise I'll be around here and other forums
bothering people. Thanks a lot to all you guys!!!

sincerely

Begona.- the happiest one, right now!! hehe

-----Mensaje original-----
De: owner-artoolkit@h ..................
[mailto:owner-artoolkit@h ..................]En nombre de Robert Hinn
Enviado el: jueves, 20 de mayo de 2004 17:26
Para: artoolkit@h ..................
Asunto: Re: I need to aply a texture to my 3D object


BSS schrieb:
> thanks robert, but when I load the same object and the same texture in the
> example I can get to work, I can see it, so.... It must be any other
stuff.
> By the way, right now I'm loading a simple sphere with a regular picture
as
> texture..so I don't know what is wrong  when I try to do it in my
> application.
> any other clues?

Well, I just tried some simple texture mapping in the simpleTest example
that comes with ARToolKit and it seems to work. Maybe you can just check
if your texture works with a simple polygon before trying to apply it to
your .3ds object, e.g.: (instead of "glutSolidCube(50.0);" in the
"draw()" function in "simple.c")

   glEnable( GL_TEXTURE_2D );
   glBindTexture( GL_TEXTURE_2D, texture[0] );
   glTexImage2D( GL_TEXTURE_2D, 0, 3, textureWidth, textureHeight, 0,
GL_RGB, GL_UNSIGNED_BYTE, textureData );
   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
   glBegin( GL_POLYGON );
   glVertex3f( -25.0f, -25.0f, 0.0f );
   glTexCoord2f( 0.0f, 0.0f );
   glVertex3f(  25.0f, -25.0f, 0.0f );
   glTexCoord2f( 1.0f, 0.0f );
   glVertex3f(  25.0f,  25.0f, 0.0f );
   glTexCoord2f( 1.0f, 1.0f );
   glVertex3f( -25.0f,  25.0f, 0.0f );
   glTexCoord2f( 0.0f, 1.0f );
   glEnd();

That way you can make sure that your texture works. There could be
several reasons why your texture isn't working, e.g.:
- your texture width and height are not a power of 2 and your example
program uses a workaround (e.g. internally using a larger texture (like
1024x1024), copying your image into it and then using texture
coordinates to only select the part of the large texture with your image
in it... this is a popular trick for using textures that have an invalid
size)
- your .3ds object doesn't set texture coordinates (the glTexCoord2f()
calls in the above code tell OpenGL which point of the texture image
corresponds to which object vertex)

I haven't worked with .3ds objects, yet (at least not directly with
OpenGL)...

Cheers,
   Robert


> Begona.-
>
> -----Mensaje original-----
> De: owner-artoolkit@h ..................
> [mailto:owner-artoolkit@h ..................]En nombre de Robert Hinn
> Enviado el: miercoles, 19 de mayo de 2004 23:35
> CC: artoolkit@h ..................
> Asunto: Re: I need to aply a texture to my 3D object
>
>
> BSS schrieb:
>
>>hello again,
>
>
> Hi,
>
>
>> I'm loading a 3d object from a .3ds file. I'm doing it successfully so I
>>can see over the marker my object. The problem is that I'm also loading
>
> the
>
>>texture (a .bmp file) for that object and when drawing the object I go
>
> thru
>
>>this two lines (more or less )for rendering the texture :
>>glEnable(GL_TEXTURE_2D) and glBindTexture( GL_TEXTURE_2D, ID), where ID is
>>the identification of the texture.....but....... this is not working!!!
>>I've been surfing on the web and I could find some examples for mapping
>>textures using OpenGl and actually I could get an example to work==> this
>>just create a regular window, load the 3d object, apply lights and
>>render....sooo, this is making me think that there must be some option
>
> when
>
>>drawing the video frame or even when creating the window that disable the
>>texture for the object.....did anyone try it before?? I don't know too
>
> much
>
>>about OpenGl so....I don't know where in the whole code I have to look
>
> for,
>
>>please help!!!!
>
>
> Hm, is your texture size (height and width, not filesize) a power of 2?
> (128x128, 256x256, 512x512, etc.)
> If not, then that might be your problem. OpenGL usually requires
> textures to have a width and height which is a power of 2...
> By the way, you can find several good OpenGL tutorials at:
>    http://nehe.gamedev.net
> (that site has nothing to do with augmented reality, but you can find
> examples for many OpenGL related topics there...)
>
> Hope I could help,
>    Robert
>
>