Thanks Puybaret,

I could write code to access CatalogTexture object using texture name. I am writing code to undo texture changes in my plugin.
i can see that undo code gets called and it is able to invoke wall.setLeftSideColour() method where i am changing colour of the wall.

though this method is invoked the change is not reflected in 3d model display screen. if i double click on wall i could see that left side colour checkbox is checked..but colour change is not getting reflected in 3d display.......

what could be the problem...do i need to call some extra method besides calling settter methods for changing colour and textures..so that the changes are reflected in 3d model...

please reply