README

voxel-mesher

A voxel mesher for ndarrays that handles ambient occlusion and transparency.

Based on @mikolalysenko's ao-mesher

npm install voxel-mesher

var mesher = game.plugins.get('voxel-mesher');

var mesh = mesher.createVoxelMesh(voxels, voxelSideTextureIDs, voxelSideTextureSizes, position, pad)

Constructs a mesh for voxels.

voxels: 3D ndarray of voxels
voxelSideTextureIDs: 2D ndarray (15-bit voxel ID, side 0-6) to 16-bit texture ID, defaults to voxel ID
voxelSideTextureSizes: 2D ndarray (15-bit voxel ID, side 0-6) to log2(texture size), defaults to 4 (2^4=16)
position: vector [x,y,z] of this chunk's position
pad: twice the number of voxels to pad around each edge (4)

Returns a typed array encoding the mesh, or else null if there were no facets. This is in the same format that voxel-shader expects:

{
    vertexArrayObjects: {surface: ..., porous: ...},
    center: [x, y, z],
    radius: w,
    modelMatrix: mat4
}

Other plugins can add their own VAOs to vertexArrayObjects, by listening for the meshed event:

mesher.on('meshed', function(result, gl, vert_data, voxels) {
    result.vertexArrayObjects.myVAO = ...
});

voxel-registry is used to lookup voxel information for meshing, the following properties are supported:

transparent: if true, the voxel textures have transparency, otherwise assumed fully opaque
blockModel: if present, passed to block-models for custom non-cube models

These properties determines the voxel type and how they are meshed:

Solid: phase 1 rendering pass - included in surface VAO
Opaque: default, bit 15 set (example: dirt)
Transparent: property transparent true, bit 15 clear (example: glass)
Porous: phase 2 rendering pass - included in porous VAO
blockModel property present
Allows for translucent (example: stained glass) and custom model (example: slabs) blocks