This is a WorldPainter plugin designed to add slab and stair detail to terrain and increase the effective resolution of the terrain. Current version: 1.0.0

Currently, the following is supported:

• Automatic stair and slab placement on terrain
• Support for Conquest Reforged shapes such as vertical slabs
• Bicubic and bilinear interpolation to upscale the internal heightmap

Place the SlabifyPlugin-X.X.X.jar into the WorldPainter plugins folder. On Windows, this would be %AppData%/Roaming/WorldPainter/plugins. Alternatively, you can click on “Open plugins folder” in the WorldPainter toolbar.

Creating a slab layer is done in a similar manner to a custom object layer.

Number	Name	Description
1	Name	The name of the layer.
2	Paint	The color of the layer.
3	Material	The material of the slab. This is not used if Option 5 is selected. The blocks must be full blocks. For example, minecraft:stone is correct, but minecraft:stone_slab will result in an error.
4	Replace non-solid blocks	Select this option to ensure slabs and other shapes will replace non-solid blocks like grass.
5	Mimic underlying blocks	Select this option to enable Options 10 to 15.
6	Height increase	The amount to increase the height by. Allowable values range from 0 to 1.5. Setting this value to 0 will result in both the removal and addition of blocks to the terrain. Setting this value to 0.5 will result in (typically) only the addition of blocks to the terrain. For reference, the WorldPainter frost layer increases the terrain height by 0.5.
7	Use Conquest blocks	Select this option to allow blocks from the conquest namespace. This option must be selected to enable the additional Conquest shapes.
8	Allowed shapes	Click this button to open a dialog to select the shapes to use (e.g., stairs and slabs).
9	Interpolation method	The interpolation method to use to inform slab and shape placement. Bilinear is faster and bicubic is slower. However, bicubic interpolation results in sharper images and may result in better-looking terrain in certain applications.
10	“Mimic” table	This table will only be active if Option 5 is selected. This allows the placement of a certain slab material on top of a terrain material. For instance, if the underlying block is minecraft:stone and the slab block is minecraft:diorite, diorite slabs and stairs will be placed on top stone blocks whereever needed. Like Option 3, the slab block must be a full block. minecraft:diorite is correct, but minecraft:diorite_slab is not!
11	Add table entry	Add an extra row to the table.
12	Remove table entry	Remove the last row of the table.
13	Load configuration	Load a previous table configuration from file.
14	Save configuration	Save the current table configuration to file.
15	Visualizer	Visualize how the slabs/stairs would look on the underlying block.

All the shapes should be self-explanatory. Note that in Vanilla Minecraft, the shape is only available for minecraft:snow_block (as snow layers). No issues will arise if a shape that is not available is selected.

Advanced: After running the plugin at least once, there should be a file %AppData%/Roaming/WorldPainter/mapping.csv. This file links together blocks and their slab and stair (and Conquest shape) variants. The first column represents the block to be entered and the remaining columns represent the variants connected to that block. If you are unsure which block to enter to get a certain slab material, this file is your guide. While you can also add your own rows to this file, it is comprehensive for both Vanilla Minecraft and Conquest Reforged.

This plugin is still under development. If a bug occurs, please contact me through Discord or create an issue. Files with layers created by older versions will be backwards compatible with newer versions unless noted otherwise. As my time is limited, contributions are highly welcome!

Slabify is open source software, licensed under the GPL version 3. This means that if you distribute it, original or in modified form, you must also distribute it (including your changes) as open source under the GPL version 3 (or later). See the LICENSE file for details.