When using UVW Xform parameters (offset/rotation/tiling), you use negative values for the parameters (for examples, find the tutorial in railclone "Next steps” manual {version 6 page 101}: UVW XForm Operator> Randomising existing UVWs). My understanding is that UV space starts from zero to one and anything outside that will not be rendered. Is it because you use multi tile UV mapping for UVW Xform?
I would like to understand how negative values is used in "UVW Xform" parameters in railclone?