Apologies for the delay in replying. I've been running some tests here are there are several limitations when using automatic box mapping to create a seamless join between start, end, corner and evenly segments. At present it works best to create seamless mapping only across default segments. We'll try to improve it in the future,but due to limitations in the way it works I can't say if or when this will happen. In the meantime I propose a different approach:
1. UV map your 3 segments so that the mid section uses the whole U space from 0-1. The left segment aligns U coordinate 1 with its right edge. The left segment aligns U coordinate 0 with its left edge.
2 - Next add these to the corresponding slots in the A2S generator. Set the Generator's default
mode to Adaptive
3- To randomise the UVW offset, wire each segment to its own UVW XForm
operator. Export the U and V Fixed Offset
4 - Connect a single Random
number node to all the exported offsets and change Generate on
to Array Y Row
. This will randomly offset the UVs the same amount for all the segments in the same row.
I hope that helps out. I've attached a sample file so you can see how this works more clearly. If you have any further questions please let me know.