Hi,
In the latest version you can control the filter mode of textures. So in your case you would do something like this:
Code:
tex = viz.add('texture.jpg')
tex.filter(viz.MIN_FILTER,viz.NEAREST)
tex.filter(viz.MAG_FILTER,viz.NEAREST)
object.texture(tex)
However, this method seems like it would be very inefficient if you have a lot of textures that you want to change. So, I'm going to add a new appearance mode,
viz.TEXMIPMAP and
viz.TEXNEAREST. We are planning on creating an installer for the latest version today, so you can test it out tomorrow morning.