Struct Solidity 

pub struct Solidity {
    pub bedrock_blocks: bool,
    pub passable: Option<fn(VoxColor) -> bool>,
}

What counts as solid for a collision probe.

Fields

bedrock_blocks: bool

Does the voxlap bedrock placeholder (chunk-local z = CHUNK_SIZE_Z - 1) block? Default false, matching the demos’ treat_z_max_as_air rendering. Set true for worlds whose bottom plane is genuinely solid ground rendered as such — collision and rendering must agree, or the player either hits an invisible wall or falls through a visible floor.

passable: Option<fn(VoxColor) -> bool>

The material hook (CC.4): a colour veto for visible voxels. Some(f) makes a voxel whose colour f approves passable — water, foliage, ladders — while everything else still blocks; None (default) blocks on any voxel. A plain fn (not a closure) so Solidity stays Copy; key it the way material maps key their colours (compare .rgb_part(), ignore the brightness byte — lighting bakes rewrite it).

Limitation, inherent to the voxlap slab format: hidden run interiors (Cube::UnexposedSolid) store no colour and always block. Rule of thumb: a pass-through wall/curtain works up to 2 voxels thick (every voxel still has an exposed face and carries its colour); at 3+ a colourless core appears and blocks. Filled pools are wade-through only near their visible surface. Also keep such geometry at least 1 voxel away from chunk-local x/y = 0 and the chunk’s far edge: the slab encoder treats out-of-chunk neighbours as solid, so edge voxels lose their side colours (they render, but classify as UnexposedSolid — both facts are pinned in this module’s tests).

Trait Implementations

impl Clone for Solidity

fn clone(&self) -> Solidity

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Solidity

impl Debug for Solidity

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Solidity

fn default() -> Solidity

Returns the “default value” for a type.