diff --git a/prismarine-viewer/package.json b/prismarine-viewer/package.json
index 6fb40075..2832224f 100644
--- a/prismarine-viewer/package.json
+++ b/prismarine-viewer/package.json
@@ -8,7 +8,7 @@
     "pretest": "npm run lint",
     "lint": "standard",
     "fix": "standard --fix",
-    "postinstall": "node viewer/generateTextures.js && node buildWorker.mjs"
+    "postinstall": "tsx viewer/prepare/generateTextures.ts && node buildWorker.mjs"
   },
   "author": "PrismarineJS",
   "license": "MIT",
diff --git a/prismarine-viewer/viewer/generateTextures.js b/prismarine-viewer/viewer/generateTextures.js
deleted file mode 100644
index 796c5652..00000000
--- a/prismarine-viewer/viewer/generateTextures.js
+++ /dev/null
@@ -1,31 +0,0 @@
-const path = require('path')
-const { makeTextureAtlas } = require('./lib/atlas')
-const { prepareBlocksStates } = require('./lib/modelsBuilder')
-const mcAssets = require('minecraft-assets')
-const fs = require('fs-extra')
-
-const texturesPath = path.resolve(__dirname, '../public/textures')
-if (fs.existsSync(texturesPath) && !process.argv.includes('-f')) {
-  console.log('textures folder already exists, skipping...')
-  process.exit(0)
-}
-fs.mkdirSync(texturesPath, { recursive: true })
-
-const blockStatesPath = path.resolve(__dirname, '../public/blocksStates')
-fs.mkdirSync(blockStatesPath, { recursive: true })
-
-for (const version of mcAssets.versions) {
-  const assets = mcAssets(version)
-  const atlas = makeTextureAtlas(assets)
-  const out = fs.createWriteStream(path.resolve(texturesPath, version + '.png'))
-  const stream = atlas.canvas.pngStream()
-  stream.on('data', (chunk) => out.write(chunk))
-  stream.on('end', () => console.log('Generated textures/' + version + '.png'))
-
-  const blocksStates = JSON.stringify(prepareBlocksStates(assets, atlas))
-  fs.writeFileSync(path.resolve(blockStatesPath, version + '.json'), blocksStates)
-
-  fs.copySync(assets.directory, path.resolve(texturesPath, version), { overwrite: true })
-}
-
-fs.writeFileSync(path.resolve(__dirname, '../public/supportedVersions.json'), '[' + mcAssets.versions.map(v => `"${v}"`).toString() + ']')
diff --git a/prismarine-viewer/viewer/lib/entities.js b/prismarine-viewer/viewer/lib/entities.js
index 9c2c0029..ed9459d9 100644
--- a/prismarine-viewer/viewer/lib/entities.js
+++ b/prismarine-viewer/viewer/lib/entities.js
@@ -5,26 +5,26 @@ const Entity = require('./entity/Entity')
 const { dispose3 } = require('./dispose')
 
 function getUsernameTexture(username, { fontFamily = 'sans-serif' }) {
-const canvas = document.createElement('canvas');
-const ctx = canvas.getContext('2d');
+  const canvas = document.createElement('canvas')
+  const ctx = canvas.getContext('2d')
 
-const fontSize = 50;
-const padding = 5
-ctx.font = `${fontSize}px ${fontFamily}`;
+  const fontSize = 50
+  const padding = 5
+  ctx.font = `${fontSize}px ${fontFamily}`
 
-const textWidth = ctx.measureText(username).width + padding * 2;
+  const textWidth = ctx.measureText(username).width + padding * 2
 
-canvas.width = textWidth;
-canvas.height = fontSize + padding * 2;
+  canvas.width = textWidth
+  canvas.height = fontSize + padding * 2
 
-ctx.fillStyle = 'rgba(0, 0, 0, 0.3)';
-ctx.fillRect(0, 0, canvas.width, canvas.height);
+  ctx.fillStyle = 'rgba(0, 0, 0, 0.3)'
+  ctx.fillRect(0, 0, canvas.width, canvas.height)
 
-ctx.font = `${fontSize}px ${fontFamily}`;
-ctx.fillStyle = 'white'
-ctx.fillText(username, padding, fontSize);
+  ctx.font = `${fontSize}px ${fontFamily}`
+  ctx.fillStyle = 'white'
+  ctx.fillText(username, padding, fontSize)
 
-return canvas;
+  return canvas
 }
 
 function getEntityMesh (entity, scene, options) {
@@ -33,7 +33,7 @@ function getEntityMesh (entity, scene, options) {
       const e = new Entity('1.16.4', entity.name, scene)
 
       if (entity.username !== undefined) {
-        const canvas = getUsernameTexture(entity.username, options);
+        const canvas = getUsernameTexture(entity.username, options)
         const tex = new THREE.Texture(canvas)
         tex.needsUpdate = true
         const spriteMat = new THREE.SpriteMaterial({ map: tex })
@@ -51,7 +51,7 @@ function getEntityMesh (entity, scene, options) {
 
   const geometry = new THREE.BoxGeometry(entity.width, entity.height, entity.width)
   geometry.translate(0, entity.height / 2, 0)
-  const material = new THREE.MeshBasicMaterial({ color: 0xff00ff })
+  const material = new THREE.MeshBasicMaterial({ color: 0xff_00_ff })
   const cube = new THREE.Mesh(geometry, material)
   return cube
 }
diff --git a/prismarine-viewer/viewer/lib/models.ts b/prismarine-viewer/viewer/lib/models.ts
index bf5841e0..605cf2e9 100644
--- a/prismarine-viewer/viewer/lib/models.ts
+++ b/prismarine-viewer/viewer/lib/models.ts
@@ -484,7 +484,7 @@ function matchProperties (block, properties) {
 
 function getModelVariants (block) {
   // air, cave_air, void_air and so on...
-  if (block.name.endsWith('air')) return []
+  if (block.name === 'air' || block.name.endsWith('_air')) return []
   const state = blockStates[block.name] ?? blockStates.missing_texture
   if (!state) return []
   if (state.variants) {
diff --git a/prismarine-viewer/viewer/lib/modelsBuilder.js b/prismarine-viewer/viewer/lib/modelsBuilder.js
deleted file mode 100644
index 58aca167..00000000
--- a/prismarine-viewer/viewer/lib/modelsBuilder.js
+++ /dev/null
@@ -1,139 +0,0 @@
-function cleanupBlockName (name) {
-  if (name.startsWith('block') || name.startsWith('minecraft:block')) return name.split('/')[1]
-  return name
-}
-
-function getModel (name, blocksModels) {
-  name = cleanupBlockName(name)
-  const data = blocksModels[name]
-  if (!data) {
-    return null
-  }
-
-  let model = { textures: {}, elements: [], ao: true }
-
-  for (const axis in ['x', 'y', 'z']) {
-    if (axis in data) {
-      model[axis] = data[axis]
-    }
-  }
-
-  if (data.parent) {
-    model = getModel(data.parent, blocksModels)
-  }
-  if (data.textures) {
-    Object.assign(model.textures, JSON.parse(JSON.stringify(data.textures)))
-  }
-  if (data.elements) {
-    model.elements = JSON.parse(JSON.stringify(data.elements))
-  }
-  if (data.ambientocclusion !== undefined) {
-    model.ao = data.ambientocclusion
-  }
-  return model
-}
-
-function prepareModel (model, texturesJson) {
-  // resolve texture names eg west: #all -> blocks/stone
-  for (const tex in model.textures) {
-    let root = model.textures[tex]
-    while (root.charAt(0) === '#') {
-      root = model.textures[root.substr(1)]
-    }
-    model.textures[tex] = root
-  }
-  for (const tex in model.textures) {
-    let name = model.textures[tex]
-    name = cleanupBlockName(name)
-    model.textures[tex] = texturesJson[name]
-  }
-  for (const elem of model.elements) {
-    for (const sideName of Object.keys(elem.faces)) {
-      const face = elem.faces[sideName]
-
-      if (face.texture.charAt(0) === '#') {
-        face.texture = JSON.parse(JSON.stringify(model.textures[face.texture.substr(1)]))
-      } else {
-        let name = face.texture
-        name = cleanupBlockName(name)
-        face.texture = JSON.parse(JSON.stringify(texturesJson[name]))
-      }
-
-      let uv = face.uv
-      if (!uv) {
-        const _from = elem.from
-        const _to = elem.to
-
-        // taken from https://github.com/DragonDev1906/Minecraft-Overviewer/
-        uv = {
-          north: [_to[0], 16 - _to[1], _from[0], 16 - _from[1]],
-          east: [_from[2], 16 - _to[1], _to[2], 16 - _from[1]],
-          south: [_from[0], 16 - _to[1], _to[0], 16 - _from[1]],
-          west: [_from[2], 16 - _to[1], _to[2], 16 - _from[1]],
-          up: [_from[0], _from[2], _to[0], _to[2]],
-          down: [_to[0], _from[2], _from[0], _to[2]]
-        }[sideName]
-      }
-
-      const su = (uv[2] - uv[0]) * face.texture.su / 16
-      const sv = (uv[3] - uv[1]) * face.texture.sv / 16
-      face.texture.bu = face.texture.u + 0.5 * face.texture.su
-      face.texture.bv = face.texture.v + 0.5 * face.texture.sv
-      face.texture.u += uv[0] * face.texture.su / 16
-      face.texture.v += uv[1] * face.texture.sv / 16
-      face.texture.su = su
-      face.texture.sv = sv
-    }
-  }
-}
-
-function resolveModel (name, blocksModels, texturesJson) {
-  const model = getModel(name, blocksModels)
-  prepareModel(model, texturesJson.textures)
-  return model
-}
-
-function prepareBlocksStates (mcAssets, atlas) {
-  const blocksStates = mcAssets.blocksStates
-  mcAssets.blocksStates["missing_texture"] = {
-    "variants": {
-      "normal": {
-        "model": "missing_texture"
-      }
-    }
-  },
-    mcAssets.blocksModels["missing_texture"] = {
-      "parent": "block/cube_all",
-      "textures": {
-        "all": "blocks/missing_texture"
-      }
-    }
-  for (const block of Object.values(blocksStates)) {
-    if (!block) continue
-    if (block.variants) {
-      for (const variant of Object.values(block.variants)) {
-        if (variant instanceof Array) {
-          for (const v of variant) {
-            v.model = resolveModel(v.model, mcAssets.blocksModels, atlas.json)
-          }
-        } else {
-          variant.model = resolveModel(variant.model, mcAssets.blocksModels, atlas.json)
-        }
-      }
-    }
-    if (block.multipart) {
-      for (const variant of block.multipart) {
-        if (variant.apply instanceof Array) {
-          for (const v of variant.apply) {
-            v.model = resolveModel(v.model, mcAssets.blocksModels, atlas.json)
-          }
-        } else {
-          variant.apply.model = resolveModel(variant.apply.model, mcAssets.blocksModels, atlas.json)
-        }
-      }
-    }
-  }
-  return blocksStates
-}
-
-module.exports = { prepareBlocksStates }
diff --git a/prismarine-viewer/viewer/lib/atlas.js b/prismarine-viewer/viewer/prepare/atlas.ts
similarity index 57%
rename from prismarine-viewer/viewer/lib/atlas.js
rename to prismarine-viewer/viewer/prepare/atlas.ts
index d36ccca3..23a93707 100644
--- a/prismarine-viewer/viewer/lib/atlas.js
+++ b/prismarine-viewer/viewer/prepare/atlas.ts
@@ -1,6 +1,6 @@
-const fs = require('fs')
-const { Canvas, Image } = require('canvas')
-const path = require('path')
+import fs from 'fs'
+import path from 'path'
+import { Canvas, Image } from 'canvas'
 
 function nextPowerOfTwo (n) {
   if (n === 0) return 1
@@ -13,44 +13,50 @@ function nextPowerOfTwo (n) {
   return n + 1
 }
 
+const localTextures = ['missing_texture.png']
+
 function readTexture (basePath, name) {
-  if (name === 'missing_texture.png') {
+  if (localTextures.includes(name)) {
     // grab ./missing_texture.png
     basePath = __dirname
   }
   return fs.readFileSync(path.join(basePath, name), 'base64')
 }
 
-function makeTextureAtlas (mcAssets) {
+export function makeTextureAtlas (mcAssets) {
   const blocksTexturePath = path.join(mcAssets.directory, '/blocks')
   const textureFiles = fs.readdirSync(blocksTexturePath).filter(file => file.endsWith('.png'))
-  textureFiles.unshift('missing_texture.png')
+  textureFiles.unshift(...localTextures)
 
   const texSize = nextPowerOfTwo(Math.ceil(Math.sqrt(textureFiles.length)))
   const tileSize = 16
 
   const imgSize = texSize * tileSize
-  const canvas = new Canvas(imgSize, imgSize, 'png')
+  const canvas = new Canvas(imgSize, imgSize, 'png' as any)
   const g = canvas.getContext('2d')
 
   const texturesIndex = {}
 
+  let offset = 0
   for (const i in textureFiles) {
-    const x = (i % texSize) * tileSize
-    const y = Math.floor(i / texSize) * tileSize
+    const pos = +i + offset
+    const x = (pos % texSize) * tileSize
+    const y = Math.floor(pos / texSize) * tileSize
 
     const name = textureFiles[i].split('.')[0]
 
-    texturesIndex[name] = { u: x / imgSize, v: y / imgSize, su: tileSize / imgSize, sv: tileSize / imgSize }
-
     const img = new Image()
     img.src = 'data:image/png;base64,' + readTexture(blocksTexturePath, textureFiles[i])
-    g.drawImage(img, 0, 0, 16, 16, x, y, 16, 16)
+    const needsMoreWidth = img.width > tileSize
+    if (needsMoreWidth) {
+      console.log('needs more', name, img.width, img.height)
+      offset++
+    }
+    const renderWidth = needsMoreWidth ? tileSize * 2 : tileSize
+    g.drawImage(img, 0, 0, img.width, img.height, x, y, renderWidth, tileSize)
+
+    texturesIndex[name] = { u: x / imgSize, v: y / imgSize, su: renderWidth / imgSize, sv: tileSize / imgSize }
   }
 
   return { image: canvas.toBuffer(), canvas, json: { size: tileSize / imgSize, textures: texturesIndex } }
 }
-
-module.exports = {
-  makeTextureAtlas
-}
diff --git a/prismarine-viewer/viewer/prepare/generateTextures.ts b/prismarine-viewer/viewer/prepare/generateTextures.ts
new file mode 100644
index 00000000..3a0b4388
--- /dev/null
+++ b/prismarine-viewer/viewer/prepare/generateTextures.ts
@@ -0,0 +1,37 @@
+import path from 'path'
+import { makeTextureAtlas } from './atlas'
+import { McAssets, prepareBlocksStates } from './modelsBuilder'
+import mcAssets from 'minecraft-assets'
+import fs from 'fs-extra'
+
+const publicPath = path.resolve(__dirname, '../../public')
+
+const texturesPath = path.join(publicPath, 'textures')
+if (fs.existsSync(texturesPath) && !process.argv.includes('-f')) {
+  console.log('textures folder already exists, skipping...')
+  process.exit(0)
+}
+fs.mkdirSync(texturesPath, { recursive: true })
+
+const blockStatesPath = path.join(publicPath, 'blocksStates')
+fs.mkdirSync(blockStatesPath, { recursive: true })
+
+Promise.resolve().then(async () => {
+  for (const version of mcAssets.versions) {
+    const assets = mcAssets(version)
+    // #region texture atlas
+    const atlas = makeTextureAtlas(assets)
+    const out = fs.createWriteStream(path.resolve(texturesPath, version + '.png'))
+    const stream = (atlas.canvas as any).pngStream()
+    stream.on('data', (chunk) => out.write(chunk))
+    stream.on('end', () => console.log('Generated textures/' + version + '.png'))
+    // #endregion
+
+    const blocksStates = JSON.stringify(prepareBlocksStates(assets, atlas))
+    fs.writeFileSync(path.resolve(blockStatesPath, version + '.json'), blocksStates)
+
+    fs.copySync(assets.directory, path.resolve(texturesPath, version), { overwrite: true })
+  }
+
+  fs.writeFileSync(path.join(publicPath, 'supportedVersions.json'), '[' + mcAssets.versions.map(v => `"${v}"`).toString() + ']')
+})
diff --git a/prismarine-viewer/viewer/lib/missing_texture.png b/prismarine-viewer/viewer/prepare/missing_texture.png
similarity index 100%
rename from prismarine-viewer/viewer/lib/missing_texture.png
rename to prismarine-viewer/viewer/prepare/missing_texture.png
diff --git a/prismarine-viewer/viewer/prepare/modelsBuilder.ts b/prismarine-viewer/viewer/prepare/modelsBuilder.ts
new file mode 100644
index 00000000..00fbdf94
--- /dev/null
+++ b/prismarine-viewer/viewer/prepare/modelsBuilder.ts
@@ -0,0 +1,251 @@
+type ModelBasic = {
+  model: string
+  x?: number
+  y?: number
+  uvlock?: boolean
+}
+
+type BlockApplyModel = ModelBasic | (ModelBasic & { weight })[]
+
+type BlockStateCondition = {
+  [name: string]: string | number
+}
+
+type BlockState = {
+  variants?: {
+    [name: string | ""]: BlockApplyModel
+  }
+  multipart?: {
+    when: {
+      [name: string]: string | number
+    } & {
+      OR?: BlockStateCondition[]
+    }
+    apply: BlockApplyModel
+  }[]
+}
+
+type BlockModel = {
+  parent?: string
+  textures?: {
+    [name: string]: string
+  }
+  elements?: {
+    from: number[]
+    to: number[]
+    faces: {
+      [name: string]: {
+        texture: string
+        uv?: number[]
+        cullface?: string
+      }
+    }
+  }[]
+  ambientocclusion?: boolean
+  x?: number
+  y?: number
+  z?: number
+  ao?: boolean
+}
+
+export type McAssets = {
+  blocksStates: {
+    [x: string]: BlockState
+  }
+  blocksModels: {
+    [x: string]: BlockModel
+  }
+  directory: string
+  version: string
+}
+
+export type BlockStatesOutput = {
+  // states: {
+  [blockName: string]: ResolvedModel
+  // }
+  // defaults: {
+  //   su: number
+  //   sv: number
+  // }
+}
+
+export type ResolvedModel = {
+  textures: {
+    [name: string]: {
+      u: number
+      v: number
+      su: number
+      sv: number
+      bu: number
+      bv: number
+    }
+  }
+  elements: {
+    from: number[]
+    to: number[]
+    faces: {
+      [name: string]: {
+        texture: {
+          u: number
+          v: number
+          su: number
+          sv: number
+          bu: number
+          bv: number
+        }
+      }
+    }
+  }[]
+  ao: boolean
+  x?: number
+  y?: number
+  z?: number
+}
+
+export const addBlockAllModel = (mcAssets: McAssets, name: string, texture = name) => {
+  mcAssets.blocksStates[name] = {
+    "variants": {
+      "": {
+        "model": name
+      }
+    }
+  }
+  mcAssets.blocksModels[name] = {
+    "parent": "block/cube_all",
+    "textures": {
+      "all": `blocks/${texture}`
+    }
+  }
+}
+
+function cleanupBlockName (name: string) {
+  if (name.startsWith('block') || name.startsWith('minecraft:block')) return name.split('/')[1]
+  return name
+}
+
+const objectAssignStrict = <T extends Record<string, any>>(target: T, source: Partial<T>) => Object.assign(target, source)
+
+function getFinalModel (name: string, blocksModels: { [x: string]: BlockModel }) {
+  name = cleanupBlockName(name)
+  const input = blocksModels[name]
+  if (!input) {
+    return null
+  }
+
+  let out: BlockModel | null = {
+    textures: {},
+    elements: [],
+    ao: true,
+    x: input.x,
+    y: input.y,
+    z: input.z,
+  }
+
+  if (input.parent) {
+    out = getFinalModel(input.parent, blocksModels)
+    if (!out) return null
+  }
+  if (input.textures) {
+    Object.assign(out.textures!, deepCopy(input.textures))
+  }
+  if (input.elements) out.elements = deepCopy(input.elements)
+  if (input.ao !== undefined) out.ao = input.ao
+  return out
+}
+
+const deepCopy = (obj) => JSON.parse(JSON.stringify(obj))
+
+function prepareModel (model: BlockModel, texturesJson) {
+  const newModel = {}
+
+  const getFinalTexture = (originalBlockName) => {
+    // texture name e.g. blocks/anvil_base
+    const cleanBlockName = cleanupBlockName(originalBlockName);
+    return {...texturesJson[cleanBlockName], __debugName: cleanBlockName}
+  }
+
+  const finalTextures = []
+
+  // resolve texture names eg west: #all -> blocks/stone
+  for (const side in model.textures) {
+    let texture = model.textures[side]
+
+    while (texture.charAt(0) === '#') {
+      texture = model.textures[texture.slice(1)]
+    }
+
+    finalTextures[side] = getFinalTexture(texture)
+  }
+
+  for (const elem of model.elements!) {
+    for (const sideName of Object.keys(elem.faces)) {
+      const face = elem.faces[sideName]
+
+      const finalTexture = deepCopy(
+        face.texture.charAt(0) === '#'
+          ? finalTextures![face.texture.slice(1)]
+          : getFinalTexture(face.texture)
+      )
+
+      const _from = elem.from
+      const _to = elem.to
+      // taken from https://github.com/DragonDev1906/Minecraft-Overviewer/
+      const uv = face.uv || {
+        // default UVs
+        // format: [u1, v1, u2, v2] (u = x, v = y)
+        north: [_to[0], 16 - _to[1], _from[0], 16 - _from[1]],
+        east: [_from[2], 16 - _to[1], _to[2], 16 - _from[1]],
+        south: [_from[0], 16 - _to[1], _to[0], 16 - _from[1]],
+        west: [_from[2], 16 - _to[1], _to[2], 16 - _from[1]],
+        up: [_from[0], _from[2], _to[0], _to[2]],
+        down: [_to[0], _from[2], _from[0], _to[2]]
+      }[sideName]!
+
+      const su = (uv[2] - uv[0]) / 16 * finalTexture.su
+      const sv = (uv[3] - uv[1]) / 16 * finalTexture.sv
+      finalTexture.u += uv[0] / 16 * finalTexture.su
+      finalTexture.v += uv[1] / 16 * finalTexture.sv
+      finalTexture.su = su
+      finalTexture.sv = sv
+      face.texture = finalTexture
+    }
+  }
+  return model
+}
+
+function resolveModel (name, blocksModels, texturesJson) {
+  const model = getFinalModel(name, blocksModels)
+  return prepareModel(model, texturesJson.textures)
+}
+
+export function prepareBlocksStates (mcAssets: McAssets, atlas: { json: any }) {
+  addBlockAllModel(mcAssets, 'missing_texture')
+
+  const blocksStates = mcAssets.blocksStates
+  for (const block of Object.values(blocksStates)) {
+    if (!block) continue
+    if (block.variants) {
+      for (const variant of Object.values(block.variants)) {
+        if (variant instanceof Array) {
+          for (const v of variant) {
+            v.model = resolveModel(v.model, mcAssets.blocksModels, atlas.json) as any
+          }
+        } else {
+          variant.model = resolveModel(variant.model, mcAssets.blocksModels, atlas.json) as any
+        }
+      }
+    }
+    if (block.multipart) {
+      for (const variant of block.multipart) {
+        if (variant.apply instanceof Array) {
+          for (const v of variant.apply) {
+            v.model = resolveModel(v.model, mcAssets.blocksModels, atlas.json) as any
+          }
+        } else {
+          variant.apply.model = resolveModel(variant.apply.model, mcAssets.blocksModels, atlas.json) as any
+        }
+      }
+    }
+  }
+  return blocksStates
+}