I have noticed that the quality of my texture is not any where as good once loaded into my game. I use something like this to load my texture: - The texture is used for a large terrain map, so it is "stretched" over many triangles. This is the source texture: - This what it looks like once it is applied as a texture: - I have tried playing around with glTexParameter to no avail. I don't know if the solution lies in ILUT or GLUT... I have looked through the ILUT documentation, and also played around with iluBuildMipmaps, but I don't know if that's what's needed or if I'm using it correctly. (Calling iluBuildMipmaps() just after calling ilutGLBindTexImage()) What can I do to increase the quality of the texture? Note that the enum "GL_TEXTURE_LOD_BIAS" does not compile - an error occurs explaining that it has not been defined. Thanks for any help If this helps, my extensions string includes: - GL_ARB_depth_texture GL_ARB_shadow GL_EXT_texture_lod

Ok, I've played around with the following: -

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST) ; glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST) ;

and

glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ) ;
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ) ;

The terrain texture is a 2500 x 2500 pixel bitmap (17.8 MB) - (the "source texture" shown in my previous post was a small sample of the whole texture)
The small coloured square is a 4 x 4 pixel jpeg ( 1.6 KB )

This is with LINEAR: -


This is with NEAREST: -


All screenshots can be found here.

Regarding the large terrain texture... is there a limit to the size of a texture? It seems like the true texture resolution is not being represented in-game. How do I achieve a highly detailed terrain texture?

With the various calls to glGetString and MARS_999's max texture retrieval, I get this: -

Vendor : NVIDIA Corporation
Renderer : GeForce 7600 GT/PCI/SSE2
Version : 2.1.2
Max Texture size : 4096


If I wanted a really detailed terrain, I would have to use many different textures and tile them across it...?

In game, the size of the map is 680 x 800 (OpenGL units), although, this is very likely to change (I have a vector of vectors storing the map data).

To me, the texture on your terrain looked like a 128x128 texture. Perhaps you shouldn't use ILUT and look for an alternative or just use IL to get the pixels and upload to GL by yourself.