Hello, if you haven't tried this already, have a go at altering the mapping mode in Bryce.

In Bryce, select the cube you've shown

Click on the M on the menu that shows up beside the cube. This takes you to the MAT lab

You'll see the material preview in the image at top left of the MAT lab, and this will alter as you adjust the mapping

At top right of the display there are 3 little images showing colour, value and bump previews. Below these is a drop-down arrow. Click this to get a list of mapping modes.

The mode will probably be set to Parametric as default

Try changing to some of the other modes, such as Object Top or Object Space, and see what happens. Try the mapping modifier Scale Pict Size on top of each of these as well and see if that helps.

You can also nudge, rotate and scale textures using the Edit Texture tool (click top left button above the right-hand pane in the MAT lab display).

I think it's worth giving the above a try, but to be honest I'm not optimistic. I've never tried to do this sort of thing in Bryce, and I think that the UV mapping may simply override what you try to do with the native mapping modes.

Another thing you could think about is putting your OBJ through a half-way house application that is more of an age match with Bryce - Hexagon springs to mind. Hexagon is free to download if you sign up to the DAZ3d website. It has been updated a fair bit recently but has its own UV mapping that Bryce is more likely to understand. You can adjust the UVs in Hexagon if necessary, although its mapping tools are very simple compared to Zbrush.