Textures Scrambled

[lionfish]

I've another graphics problem (different computer this time - indeed the laptop I was having trouble with in the other thread doesn't have this problem).

On a couple of computers I've run my vizard environment on, I find the textures become horribly scrambled: there's gaps at the edges of tiles, and textures from one object are being drawn on another - such that one fades into the other texture as you approach (see attached images).

It often appears that the font becomes scrambled too.

I'm wondering if it's because I'm only using OpenGL 1.4? Is there a minimum OpenGL version that Vizard will be happy with?

The objects are exports from 3DSM (in .WRL format, using default export settings). The textures are in png and jpg formats - their dimensions aren't necessarily powers of 2.

The environment looks fine on a brand new laptop we recently bought. Other graphics applications have looked fine on this computer (e.g. Google Earth).

Thanks!

Mike.

System Details:
Graphics adapter: Intel(R) 945/G Express.
Driver: I've the latest version of the Intel graphics driver installed (6.14.10.4543)
OS: XP Professional (32 bit)
OpenGL: version 1.4
(features beyond 1.4 appear mostly unsupported).

OpenGL Extensions Viewer highlighted a few issues:
-No texture edge clamp support
(This feature adds clamping control to edge texel filtering. Some programs may not render textures correctly (black line on borders.) )
-No OpenGL Shading Language support
(This may break compatibility for applications using per pixel shading.)
-No Frame buffer object support
(This may break compatibility for applications using render to texture functions.)