Vertical slabs

Evidence

Ran on Kiln's test stand (2026-11-04): VerticalSlabs did not start: java.lang.NoClassDefFoundError: net/minecraft/world/level/block/state/BlockBehaviour$StateArgumentPredicate; VerticalSlabsClient did not start: java.lang.NoClassDefFoundError: net/minecraft/client/data/models/blockstates/PropertyDispatch.

What it needs from Kiln

• net.fabricmc.fabric.api.registry.OxidizableBlocksRegistry
• net.minecraft.client.data.models.BlockModelGenerators
• net.minecraft.client.data.models.blockstates.MultiVariantGenerator
• net.minecraft.client.data.models.blockstates.PropertyDispatch
• net.minecraft.client.data.models.blockstates.PropertyDispatch.C2
• net.minecraft.client.data.models.model.ModelTemplate
• net.minecraft.client.data.models.model.TextureMapping
• net.minecraft.client.data.models.model.TextureSlot
• net.minecraft.client.renderer.block.dispatch.VariantMutator
• net.minecraft.client.renderer.block.dispatch.VariantMutator.VariantProperty
• net.minecraft.client.resources.model.sprite.Material
• net.minecraft.core.Direction.Axis
• net.minecraft.tags.FluidTags
• net.minecraft.world.item.DyeColor
• net.minecraft.world.level.block.ColorCollection
• net.minecraft.world.level.block.HorizontalDirectionalBlock
• net.minecraft.world.level.block.RenderShape
• net.minecraft.world.level.block.SimpleWaterloggedBlock
• net.minecraft.world.level.block.WeatheringCopper
• net.minecraft.world.level.block.WeatheringCopper.WeatherState
• net.minecraft.world.level.block.WeatheringCopperCollection
• net.minecraft.world.level.block.WeatheringCopperCollection.ByState
• net.minecraft.world.level.block.state.BlockBehaviour.StateArgumentPredicate
• net.minecraft.world.level.material.FlowingFluid
• net.minecraft.world.level.material.FluidState
• net.minecraft.world.level.material.Fluids
• net.minecraft.world.phys.AABB
• net.minecraft.world.phys.shapes.Shapes
• net.minecraft.world.phys.shapes.VoxelShape
• FabricCreativeModeTabOutput.insertAfter()
• Direction.getAxis()
• ItemStack.is()
• Items.ACACIA_PLANKS
• Items.ACACIA_SLAB
• Items.ANDESITE
• Items.ANDESITE_SLAB
• Items.BAMBOO_MOSAIC
• Items.BAMBOO_MOSAIC_SLAB
• Items.BAMBOO_PLANKS
• Items.BAMBOO_SLAB
• and 49 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3)

In the author's words

Vertical slabs for each vanilla slab

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file vertical-slabs-2.2.0-26.3.jar. The scan reads the mod's classes; it does not run them.