Hardware shading limitations

Projected textures or 3D texture placement on NURBS

Projected textures or 3D texture placement on NURBS surfaces may not reflect the correct placement in the views after you transform the shapes.

Workaround

Make an insignificant change to any of the texture’s parameters to force a proper update after the transformation.

Mapped 3D texture on polygonal object

If a polygonal object has a mapped 3D texture then hardware texturing requires that the surface have a regular grid of unique UVs between 0 and 1 for sampling the texture over the surface.

Default texture resolution issues

Default texture resolution issues (which can be modified by switching quality in the material’s Attribute Editor) include the following limitations:

The 2D file texture attempts to use the full resolution (rounded to a base 2 number) of the file, but some configurations of texture placement will result in the use of a 64x64 hardware texture (for example, if you set the Coverage to less than one this occurs).
All 2D procedural textures are represented by a 64x64 swatch.
All 3D textures are represented by a 32x32 swatch, but a dynamic attribute named resolution may be added to configure this setting.