Check this out.
So I have a little app (top left) that shows me the block I’m looking at (left) and a list of blocks which don’t have gradients mapped to them (because I cant for the life of me figure out how they are mapped in the game data).
How it works
The block on the right is the selected item in the middle list. I look at the debug coordinates in game to find the block in my list and look at it. The save button turns red when I’m looking at a block with an unsaved gradient. then I drag the third slider to find a suitable gradient then hit save.
In this video I find that some bevelled blocks don’t have the right gradient and the beacon is a special case that I"m dealing with later. then I can hit render and get a top-down view of the chunk (16x16 area) as a png.
As I go on there are less and less blocks that don’t have gradients mapped. I should be on my way to producing high-res maps of the world in no-time =D.