Font 3D rendering problem

[Renato Lima]

I have been trying to use font3d with billboard effect for a while now, but I am having the following problem: after walking around my 3d world for a while, the fonts start to render in a very strange manner. Attached you will find an example of the problem I am having.




This is the code I am using:

A = viz.add(viz.TEXT3D, iso, B)
A.alignment(viz.TEXT_CENTER_CENTER)
A.translate(0, H/2.0 + 0.25, 0)
A.color(0, 0, 0)
A.scale(0.15, 0.15, 0.15)
A.billboard(viz.BILLBOARD_YAXIS)

ideas?? Thanks