Game Development

Game Development RSS

Applying texture to sphere turns it blue

Thread Solved

•

Join Date: Jan 2008

Posts: 79

Reputation: orangejuice2005 is an unknown quantity at this point

Solved Threads: 0

orangejuice2005 orangejuice2005 is offline

Offline

Junior Poster in Training

Applying texture to sphere turns it blue

Jul 5th, 2009

Hello. I've been messing around with applying textures and i managed to apply one with no hiccups. By subsequent attempts , however, keeps turning my spheres blue! I don't know what to do.

I'm attaching what i've done so far because it's kind of long. If anyone can help me i would really appreciate it.

Attached Files

Solar System.cpp (13.3 KB, 4 views)

•

Join Date: Jun 2009

Posts: 830

Reputation: wildgoose is a name known to all

Solved Threads: 94

wildgoose

Offline

Practically a Posting Shark

Re: Applying texture to sphere turns it blue

Jul 6th, 2009

You may want to mention it is OpenGL.
I cut in my own textures and Kind of cool, but I only see one blue planet.

Adding your textures would be cool. If you're worried about copy cats, Put a big X or something on your textures so that they still look about right, though contaminated with debris!

In my code I typically have the following Render...

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
  cgGLSetTextureParameter( cg_BlinnTexture, iTex );
 
  cgGLEnableTextureParameter( cg_BlinnTexture );
  glEnable( GL_TEXTURE_2D );
  glBindTexture(GL_TEXTURE_2D, iTex);
 
  glEnableClientState( GL_TEXTURE_COORD_ARRAY );
  glTexCoordPointer( 2, GL_FLOAT, 0, pUVAry );		
 
  // other vertex information then draw
 
  glDisableClientState( GL_TEXTURE_COORD_ARRAY );
 
  glBindTexture(GL_TEXTURE_2D, 0);    // not necessary but I include it anyway!
  gllDisable( GL_TEXTURE_2D );
 
  cgGLDisableTextureParameter( cg_BlinnTexture );
  cgGLSetTextureParameter( cg_BlinnTexture, iTex );

  cgGLEnableTextureParameter( cg_BlinnTexture );
  glEnable( GL_TEXTURE_2D );
  glBindTexture(GL_TEXTURE_2D, iTex);

  glEnableClientState( GL_TEXTURE_COORD_ARRAY );
  glTexCoordPointer( 2, GL_FLOAT, 0, pUVAry );		

  // other vertex information then draw

  glDisableClientState( GL_TEXTURE_COORD_ARRAY );

  glBindTexture(GL_TEXTURE_2D, 0);    // not necessary but I include it anyway!
  gllDisable( GL_TEXTURE_2D );

  cgGLDisableTextureParameter( cg_BlinnTexture );

Last edited by wildgoose; Jul 6th, 2009 at 3:13 am. Reason: addendum

•

Join Date: Jan 2008

Posts: 79

Reputation: orangejuice2005 is an unknown quantity at this point

Solved Threads: 0

orangejuice2005 orangejuice2005 is offline

Offline

Junior Poster in Training

Re: Applying texture to sphere turns it blue

Jul 6th, 2009

Hey wildgoose! Thanks for replying. I did forget to say it was in opengl but you were smart enough to realize that it was =). I can upload the textures..its no big deal. They aren't personally made so i don't care. The only planet that should be remotely blue is the last one in the outer ring. The ones with the textures are orginallt colored white but when i apply the textures, they turn blue for some weird reason. Your render code looks similiar to mines minus a few different function calls.

Last edited by orangejuice2005; Jul 6th, 2009 at 3:54 am.

Attached Images

	mercury1.bmp (16.8 KB, 7 views)
	earth2.bmp (29.3 KB, 6 views)
	venus1.bmp (58.6 KB, 4 views)
	mars1.bmp (29.3 KB, 5 views)

•

Join Date: Jun 2009

Posts: 830

Reputation: wildgoose is a name known to all

Solved Threads: 94

wildgoose

Offline

Practically a Posting Shark

Re: Applying texture to sphere turns it blue

Jul 6th, 2009

Big possible problem.\
Your textures are not 2^N, and not all square.
Some video cards require square, but most definitely 2^N, with few exceptions. Try stretching the bitmap to 128x128, etc.

•

Join Date: Jan 2008

Posts: 79

Reputation: orangejuice2005 is an unknown quantity at this point

Solved Threads: 0

orangejuice2005 orangejuice2005 is offline

Offline

Junior Poster in Training

Re: Applying texture to sphere turns it blue

Jul 6th, 2009

Yes your right! Theres something definately wrong with the pictures here. I tried mapping the earth texture to another planet and it turned out ok. I' just tried changing the aspect ratio to what you recommended but that doesn't seem to be fixing the problem. I'll need to tinker with this in the morning or maybe get a different picture or resize it using a different program.

•

Join Date: Jan 2008

Posts: 79

Reputation: orangejuice2005 is an unknown quantity at this point

Solved Threads: 0

orangejuice2005 orangejuice2005 is offline

Offline

Junior Poster in Training

Re: Applying texture to sphere turns it blue

Jul 6th, 2009

I'm using images that adhere to that 2^N rule but am still getting the same problem. I do not believe this to be a power-of-2 issue or problem loading a texture that is beyond what my opengl implementation can do. I've also tried converting the images to .raw format to see if that changed anything but i just ended up with image distortions and you literally can't make anything out.

•

Join Date: Jun 2009

Posts: 830

Reputation: wildgoose is a name known to all

Solved Threads: 94

wildgoose

Offline

Practically a Posting Shark

Re: Applying texture to sphere turns it blue

Jul 6th, 2009

I can't examine your code right now, but have you tried increasing your radius to 4.0 or so, stopped the orbits, and rotated in place to see your planets better?

•

Join Date: Jun 2009

Posts: 830

Reputation: wildgoose is a name known to all

Solved Threads: 94

wildgoose

Offline

Practically a Posting Shark

Re: Applying texture to sphere turns it blue

Jul 6th, 2009

I normally don't use the glQuad stuff. I use my own meshes, even for sphere's.

•

Join Date: Jan 2008

Posts: 79

Reputation: orangejuice2005 is an unknown quantity at this point

Solved Threads: 0

orangejuice2005 orangejuice2005 is offline

Offline

Junior Poster in Training

Re: Applying texture to sphere turns it blue

Jul 7th, 2009

•

Originally Posted by wildgoose

I can't examine your code right now, but have you tried increasing your radius to 4.0 or so, stopped the orbits, and rotated in place to see your planets better?

Have i tried inceasing what radius to 4.0?

•

Originally Posted by wildgoose

I normally don't use the glQuad stuff. I use my own meshes, even for sphere's.

I am not that good with opengl so i like to use and tinker with already built in functions

•

Join Date: Jun 2009

Posts: 830

Reputation: wildgoose is a name known to all

Solved Threads: 94

wildgoose

Offline

Practically a Posting Shark

Re: Applying texture to sphere turns it blue

#10

Jul 7th, 2009

The planets. They're pretty small to make out on screen and making them larger for testing purposes, and making them stationary infront of the viewport.