diff --git a/animation.cm b/animation.cm
index f47fee5..0388de6 100644
--- a/animation.cm
+++ b/animation.cm
@@ -13,12 +13,12 @@ function prepare_animations(model) {
 
   var prepared = []
 
-  for (var ai = 0; ai < g.animations.length; ai++) {
+  for (var ai = 0; ai < length(g.animations); ai++) {
     var anim = g.animations[ai]
     var channels = []
     var duration = 0
 
-    for (var ci = 0; ci < anim.channels.length; ci++) {
+    for (var ci = 0; ci < length(anim.channels); ci++) {
       var chan = anim.channels[ci]
       var sampler = anim.samplers[chan.sampler]
       if (!sampler) continue
@@ -91,25 +91,25 @@ function create_instance(model, prepared_anims) {
 
 // Get clip count
 function clip_count(instance) {
-  return instance.animations ? instance.animations.length : 0
+  return instance.animations ? length(instance.animations) : 0
 }
 
 // Get clip duration
 function clip_duration(instance, clip_idx) {
-  if (!instance.animations || clip_idx >= instance.animations.length) return 0
+  if (!instance.animations || clip_idx >= length(instance.animations)) return 0
   return instance.animations[clip_idx].duration
 }
 
 // Get clip name
 function clip_name(instance, clip_idx) {
-  if (!instance.animations || clip_idx >= instance.animations.length) return null
+  if (!instance.animations || clip_idx >= length(instance.animations)) return null
   return instance.animations[clip_idx].name
 }
 
 // Find clip by name
 function find_clip(instance, name) {
   if (!instance.animations) return -1
-  for (var i = 0; i < instance.animations.length; i++) {
+  for (var i = 0; i < length(instance.animations); i++) {
     if (instance.animations[i].name == name) return i
   }
   return -1
@@ -158,16 +158,16 @@ function update(instance, dt) {
 // Apply animation to model nodes at current time
 // This samples all channels and updates node TRS values
 function apply(instance) {
-  if (!instance.animations || instance.clip_index >= instance.animations.length) return
+  if (!instance.animations || instance.clip_index >= length(instance.animations)) return
 
   var anim = instance.animations[instance.clip_index]
   var model = instance.model
   var t = instance.time
 
-  for (var ci = 0; ci < anim.channels.length; ci++) {
+  for (var ci = 0; ci < length(anim.channels); ci++) {
     var chan = anim.channels[ci]
     var node_idx = chan.node
-    if (node_idx == null || node_idx >= model.nodes.length) continue
+    if (node_idx == null || node_idx >= length(model.nodes)) continue
 
     var node = model.nodes[node_idx]
 
@@ -200,7 +200,7 @@ function apply(instance) {
   }
 
   // Mark all children dirty (propagate down hierarchy)
-  for (var ni = 0; ni < model.nodes.length; ni++) {
+  for (var ni = 0; ni < length(model.nodes); ni++) {
     var n = model.nodes[ni]
     if (n.dirty_world) {
       _mark_children_dirty(n)
@@ -209,7 +209,7 @@ function apply(instance) {
 }
 
 function _mark_children_dirty(node) {
-  for (var i = 0; i < node.children.length; i++) {
+  for (var i = 0; i < length(node.children); i++) {
     var child = node.children[i]
     child.dirty_world = true
     _mark_children_dirty(child)
diff --git a/collision.cm b/collision.cm
index 73b094f..25bbdba 100644
--- a/collision.cm
+++ b/collision.cm
@@ -39,7 +39,7 @@ function add_box(transform, sx, sy, sz, opts) {
 }
 
 function remove(collider) {
-  for (var i = 0; i < _colliders.length; i++) {
+  for (var i = 0; i < length(_colliders); i++) {
     if (_colliders[i].id == collider.id) {
       _colliders.splice(i, 1)
       return true
@@ -50,8 +50,8 @@ function remove(collider) {
 
 function overlaps(layer_mask_a, layer_mask_b) {
   var results = []
-  for (var i = 0; i < _colliders.length; i++) {
-    for (var j = i + 1; j < _colliders.length; j++) {
+  for (var i = 0; i < length(_colliders); i++) {
+    for (var j = i + 1; j < length(_colliders); j++) {
       var a = _colliders[i]
       var b = _colliders[j]
       
@@ -81,7 +81,7 @@ function raycast(ox, oy, oz, dx, dy, dz, opts) {
   var closest = null
   var closest_dist = max_dist
   
-  for (var i = 0; i < _colliders.length; i++) {
+  for (var i = 0; i < length(_colliders); i++) {
     var c = _colliders[i]
     if (!(c.layer_mask & layer_mask)) continue
     
@@ -104,7 +104,7 @@ function raycast(ox, oy, oz, dx, dy, dz, opts) {
 function _get_position(transform) {
   if (!transform) return {x: 0, y: 0, z: 0}
   // If transform is a matrix (array of 16), extract translation
-  if (transform.length == 16) {
+  if (length(transform) == 16) {
     return {x: transform[12], y: transform[13], z: transform[14]}
   }
   // If transform is an object with x,y,z
diff --git a/core.cm b/core.cm
index 1bfc0e7..ff1b14e 100644
--- a/core.cm
+++ b/core.cm
@@ -183,7 +183,7 @@ function stat(name) {
 
 function log_msg() {
   var args = []
-  for (var i = 0; i < arguments.length; i++) {
+  for (var i = 0; i < length(arguments); i++) {
     args.push(text(arguments[i]))
   }
   log.console("[lance3d] " + text(args, " "))
@@ -360,7 +360,7 @@ function anim_info(model) {
   if (!model || !model._internal) return []
   var internal = model._internal
   var result = []
-  for (var i = 0; i < internal.animations.length; i++) {
+  for (var i = 0; i < length(internal.animations); i++) {
     var anim = internal.animations[i]
     result.push({
       name: anim.name || ("clip_" + text(i)),
@@ -380,7 +380,7 @@ function sample_pose(model, name, time_val) {
   if (is_number(name)) {
     anim_idx = name
   } else {
-    for (var i = 0; i < internal.animations.length; i++) {
+    for (var i = 0; i < length(internal.animations); i++) {
       if (internal.animations[i].name == name) {
         anim_idx = i
         break
@@ -388,7 +388,7 @@ function sample_pose(model, name, time_val) {
     }
   }
   
-  if (anim_idx < 0 || anim_idx >= internal.animations.length) {
+  if (anim_idx < 0 || anim_idx >= length(internal.animations)) {
     return null
   }
   
@@ -413,17 +413,17 @@ function sample_pose(model, name, time_val) {
     node_matrices: []
   }
   
-  for (var ni = 0; ni < internal.nodes.length; ni++) {
+  for (var ni = 0; ni < length(internal.nodes); ni++) {
     pose.node_matrices.push(resources_mod.get_transform_world_matrix(internal.nodes[ni]))
   }
   
   // Build skin palettes if model has skins
-  if (internal.skins && internal.skins.length > 0) {
+  if (internal.skins && length(internal.skins) > 0) {
     pose.skin_palettes = []
-    for (var si = 0; si < internal.skins.length; si++) {
+    for (var si = 0; si < length(internal.skins); si++) {
       var skin = internal.skins[si]
       var world_matrices = []
-      for (var j = 0; j < skin.joints.length; j++) {
+      for (var j = 0; j < length(skin.joints); j++) {
         var node_idx = skin.joints[j]
         var jnode = internal.nodes[node_idx]
         if (jnode) {
@@ -456,11 +456,11 @@ function draw_model(model, transform, pose) {
   var skin_palettes = []
   if (pose && pose.skin_palettes) {
     skin_palettes = pose.skin_palettes
-  } else if (internal.skins && internal.skins.length > 0) {
-    for (var si = 0; si < internal.skins.length; si++) {
+  } else if (internal.skins && length(internal.skins) > 0) {
+    for (var si = 0; si < length(internal.skins); si++) {
       var skin = internal.skins[si]
       var world_matrices = []
-      for (var j = 0; j < skin.joints.length; j++) {
+      for (var j = 0; j < length(skin.joints); j++) {
         var node_idx = skin.joints[j]
         var jnode = internal.nodes[node_idx]
         if (jnode) {
@@ -479,7 +479,7 @@ function draw_model(model, transform, pose) {
   }
   
   // Draw each mesh in the model array
-  for (var i = 0; i < model.length; i++) {
+  for (var i = 0; i < length(model); i++) {
     var entry = model[i]
     var mesh = entry.mesh
     var mat = entry.material
@@ -502,7 +502,7 @@ function draw_model(model, transform, pose) {
     var uniforms = _build_uniforms(world_matrix, view_matrix, proj_matrix, mat)
     
     var palette = null
-    if (mesh.skinned && skin_palettes.length > 0) {
+    if (mesh.skinned && length(skin_palettes) > 0) {
       palette = skin_palettes[0]
     }
     
@@ -674,16 +674,16 @@ function _build_uniforms(model_mat, view_mat, proj_mat, mat) {
 }
 
 function _make_mesh_from_arrays(positions, normals, uvs, indices) {
-  var vertex_count = positions.length / 3
+  var vertex_count = length(positions) / 3
 
   var mesh = {
     vertex_count: vertex_count,
-    index_count: indices.length
+    index_count: length(indices)
   }
 
   mesh.positions = model_c.f32_blob(positions)
-  mesh.normals = normals && normals.length > 0 ? model_c.f32_blob(normals) : null
-  mesh.uvs = uvs && uvs.length > 0 ? model_c.f32_blob(uvs) : null
+  mesh.normals = normals && length(normals) > 0 ? model_c.f32_blob(normals) : null
+  mesh.uvs = uvs && length(uvs) > 0 ? model_c.f32_blob(uvs) : null
 
   mesh.indices = model_c.u16_blob(indices)
   mesh.index_type = "uint16"
diff --git a/examples/forest.ce b/examples/forest.ce
index ad010b3..8021477 100644
--- a/examples/forest.ce
+++ b/examples/forest.ce
@@ -137,7 +137,7 @@ function _draw() {
   lance3d.draw_mesh(ground_mesh, null, ground_mat)
 
   // Draw tree trunks
-  for (var i = 0; i < trees.length; i++) {
+  for (var i = 0; i < length(trees); i++) {
     var tree = trees[i]
     var trunk_transform = lance3d.trs_matrix(
       tree.x, tree.trunk_h / 2, tree.z,
@@ -148,7 +148,7 @@ function _draw() {
   }
 
   // Draw tree canopies
-  for (var i = 0; i < trees.length; i++) {
+  for (var i = 0; i < length(trees); i++) {
     var tree = trees[i]
     var canopy_transform = lance3d.trs_matrix(
       tree.x, tree.trunk_h + tree.canopy_s / 2, tree.z,
diff --git a/examples/modelview.ce b/examples/modelview.ce
index 36e64d6..a0c535f 100644
--- a/examples/modelview.ce
+++ b/examples/modelview.ce
@@ -52,12 +52,12 @@ function _init() {
     return
   }
 
-  log.console("Model loaded with " + text(model.length) + " mesh(es)")
+  log.console("Model loaded with " + text(length(model)) + " mesh(es)")
 
   // Get animation info
   animations = lance3d.anim_info(model)
-  log.console("  Animations: " + text(animations.length))
-  for (var i = 0; i < animations.length; i++) {
+  log.console("  Animations: " + text(length(animations)))
+  for (var i = 0; i < length(animations); i++) {
     log.console("    " + text(i) + ": " + animations[i].name + " (" + text(animations[i].duration) + "s)")
   }
 
@@ -127,17 +127,17 @@ function _update(dt) {
   }
 
   // Toggle animation with space
-  if (lance3d.keyp('space') && animations.length > 0) {
+  if (lance3d.keyp('space') && length(animations) > 0) {
     anim_playing = !anim_playing
     log.console(anim_playing ? "Animation resumed" : "Animation paused")
   }
 
   // Switch animation clips with number keys
-  if (animations.length > 0) {
+  if (length(animations) > 0) {
     for (var i = 1; i <= 9; i++) {
       if (lance3d.keyp(text(i))) {
         var clip_idx = i - 1
-        if (clip_idx < animations.length) {
+        if (clip_idx < length(animations)) {
           current_anim = clip_idx
           anim_time = 0
           log.console("Playing clip " + text(clip_idx) + ": " + animations[clip_idx].name)
@@ -158,7 +158,7 @@ function _update(dt) {
   }
 
   // Update animation time
-  if (anim_playing && animations.length > 0) {
+  if (anim_playing && length(animations) > 0) {
     anim_time += dt * anim_speed
     var duration = animations[current_anim].duration
     if (duration > 0) {
@@ -199,7 +199,7 @@ function _draw() {
   // Draw the model
   if (model) {
     var pose = null
-    if (animations.length > 0) {
+    if (length(animations) > 0) {
       pose = lance3d.sample_pose(model, current_anim, anim_time)
     }
     lance3d.draw_model(model, null, pose)
diff --git a/resources.cm b/resources.cm
index a658cc1..d659fa1 100644
--- a/resources.cm
+++ b/resources.cm
@@ -129,7 +129,7 @@ function load_model(path, style, tier) {
   var original_images = []
 
   // Load textures with platform-appropriate sizing
-  for (var ti = 0; ti < g.images.length; ti++) {
+  for (var ti = 0; ti < length(g.images); ti++) {
     var img = g.images[ti]
     var tex = null
     if (img && img.pixels) {
@@ -151,7 +151,7 @@ function load_model(path, style, tier) {
 
   // Create materials
   var gltf_mats = g.materials || []
-  for (var mi = 0; mi < gltf_mats.length; mi++) {
+  for (var mi = 0; mi < length(gltf_mats); mi++) {
     var gmat = gltf_mats[mi]
     
     var paint = [1, 1, 1, 1]
@@ -196,7 +196,7 @@ function load_model(path, style, tier) {
   }
 
   // Build node transforms
-  for (var ni = 0; ni < g.nodes.length; ni++) {
+  for (var ni = 0; ni < length(g.nodes); ni++) {
     var node = g.nodes[ni]
     var t = _make_internal_transform(node)
     t.mesh_index = node.mesh
@@ -206,27 +206,27 @@ function load_model(path, style, tier) {
   }
 
   // Set up parent-child relationships
-  for (var ni = 0; ni < internal_model.nodes.length; ni++) {
+  for (var ni = 0; ni < length(internal_model.nodes); ni++) {
     var t = internal_model.nodes[ni]
-    for (var ci = 0; ci < t.gltf_children.length; ci++) {
+    for (var ci = 0; ci < length(t.gltf_children); ci++) {
       var child_idx = t.gltf_children[ci]
-      if (child_idx < internal_model.nodes.length) {
+      if (child_idx < length(internal_model.nodes)) {
         _transform_set_parent(internal_model.nodes[child_idx], t)
       }
     }
   }
 
   // Find root nodes
-  for (var ni = 0; ni < internal_model.nodes.length; ni++) {
+  for (var ni = 0; ni < length(internal_model.nodes); ni++) {
     if (!internal_model.nodes[ni].parent) {
       internal_model.root_nodes.push(internal_model.nodes[ni])
     }
   }
 
   // Process meshes
-  for (var mi = 0; mi < g.meshes.length; mi++) {
+  for (var mi = 0; mi < length(g.meshes); mi++) {
     var mesh = g.meshes[mi]
-    for (var pi = 0; pi < mesh.primitives.length; pi++) {
+    for (var pi = 0; pi < length(mesh.primitives); pi++) {
       var prim = mesh.primitives[pi]
       var gpu_mesh = _process_gltf_primitive(g, buffer_blob, prim, textures)
       if (gpu_mesh) {
@@ -243,11 +243,11 @@ function load_model(path, style, tier) {
   internal_model.skins = skin_mod.prepare_skins(internal_model)
 
   // Build result array: [{mesh, material, node_index}]
-  for (var ni = 0; ni < internal_model.nodes.length; ni++) {
+  for (var ni = 0; ni < length(internal_model.nodes); ni++) {
     var node = internal_model.nodes[ni]
     if (node.mesh_index == null) continue
 
-    for (var mi = 0; mi < internal_model.meshes.length; mi++) {
+    for (var mi = 0; mi < length(internal_model.meshes); mi++) {
       var mesh = internal_model.meshes[mi]
       if (mesh.mesh_index != node.mesh_index) continue
 
@@ -273,7 +273,7 @@ function recalc_model_textures(model, style, tier) {
   if (!model || !model._internal) return
   var internal = model._internal
   
-  for (var ti = 0; ti < internal._original_images.length; ti++) {
+  for (var ti = 0; ti < length(internal._original_images); ti++) {
     var original = internal._original_images[ti]
     if (!original) continue
     
@@ -284,7 +284,7 @@ function recalc_model_textures(model, style, tier) {
   // Update material references
   var g = internal._gltf
   var gltf_mats = g.materials || []
-  for (var mi = 0; mi < gltf_mats.length; mi++) {
+  for (var mi = 0; mi < length(gltf_mats); mi++) {
     var gmat = gltf_mats[mi]
     if (gmat.pbr && gmat.pbr.base_color_texture) {
       var tex_info = gmat.pbr.base_color_texture
@@ -296,7 +296,7 @@ function recalc_model_textures(model, style, tier) {
   }
   
   // Update mesh textures
-  for (var mi = 0; mi < internal.meshes.length; mi++) {
+  for (var mi = 0; mi < length(internal.meshes); mi++) {
     var mesh = internal.meshes[mi]
     var mat_idx = mesh.material_index
     if (mat_idx != null && internal.materials[mat_idx]) {
@@ -305,7 +305,7 @@ function recalc_model_textures(model, style, tier) {
   }
   
   // Update result array materials
-  for (var i = 0; i < model.length; i++) {
+  for (var i = 0; i < length(model); i++) {
     var entry = model[i]
     var mat_idx = entry.mesh.material_index
     if (mat_idx != null && internal.materials[mat_idx]) {
diff --git a/sdl.cm b/sdl.cm
index f5b6487..0f6b3cc 100644
--- a/sdl.cm
+++ b/sdl.cm
@@ -231,7 +231,7 @@ function create_texture(w, h, pixels) {
 }
 
 function create_vertex_buffer(data) {
-  var size = data.length / 8
+  var size = length(data) / 8
   var buffer = new gpu_mod.buffer(_gpu, {
     size: size,
     vertex: true
@@ -258,7 +258,7 @@ function create_vertex_buffer(data) {
 }
 
 function create_index_buffer(data) {
-  var size = data.length / 8
+  var size = length(data) / 8
   var buffer = new gpu_mod.buffer(_gpu, {
     size: size,
     index: true
@@ -343,7 +343,7 @@ function submit_frame(draws, clear_color, clear_depth, style_id) {
   var triangles = 0
   var sampler = get_sampler(style_id)
 
-  for (var i = 0; i < draws.length; i++) {
+  for (var i = 0; i < length(draws); i++) {
     var d = draws[i]
 
     var skinned = d.mesh.skinned && d.palette
diff --git a/skin.cm b/skin.cm
index 847f482..3bd16a3 100644
--- a/skin.cm
+++ b/skin.cm
@@ -13,7 +13,7 @@ function prepare_skins(model) {
 
   var prepared = []
 
-  for (var si = 0; si < g.skins.length; si++) {
+  for (var si = 0; si < length(g.skins); si++) {
     var skin = g.skins[si]
 
     // Extract inverse bind matrices
@@ -37,7 +37,7 @@ function prepare_skins(model) {
     prepared.push({
       name: skin.name,
       joints: skin.joints,
-      joint_count: skin.joints.length,
+      joint_count: length(skin.joints),
       inv_bind: inv_bind_blob,
       skeleton: skin.skeleton,
       palette: null // Will be built each frame
@@ -50,11 +50,11 @@ function prepare_skins(model) {
 // Build joint palette for a skin
 // This computes world * inv_bind for each joint
 function build_palette(skin, model, retro3d) {
-  if (!skin || !skin.joints || skin.joints.length == 0) return null
+  if (!skin || !skin.joints || length(skin.joints) == 0) return null
 
   // Collect world matrices for each joint
   var world_matrices = []
-  for (var j = 0; j < skin.joints.length; j++) {
+  for (var j = 0; j < length(skin.joints); j++) {
     var node_idx = skin.joints[j]
     var node = model.nodes[node_idx]
     if (node) {
@@ -71,7 +71,7 @@ function build_palette(skin, model, retro3d) {
 
 // Get a joint's world matrix (for attachments)
 function get_joint_world(skin, joint_index, model, retro3d) {
-  if (!skin || joint_index >= skin.joints.length) {
+  if (!skin || joint_index >= length(skin.joints)) {
     return model_c.mat4_identity()
   }
 
@@ -86,7 +86,7 @@ function get_joint_world(skin, joint_index, model, retro3d) {
 function find_joint(skin, name, model) {
   if (!skin || !skin.joints) return -1
 
-  for (var j = 0; j < skin.joints.length; j++) {
+  for (var j = 0; j < length(skin.joints); j++) {
     var node_idx = skin.joints[j]
     var node = model.nodes[node_idx]
     if (node && node.name == name) return j
@@ -98,7 +98,7 @@ function find_joint(skin, name, model) {
 function joint_from_node(skin, node_idx) {
   if (!skin || !skin.joints) return -1
 
-  for (var j = 0; j < skin.joints.length; j++) {
+  for (var j = 0; j < length(skin.joints); j++) {
     if (skin.joints[j] == node_idx) return j
   }
   return -1
@@ -106,7 +106,7 @@ function joint_from_node(skin, node_idx) {
 
 // Get node index from joint index
 function node_from_joint(skin, joint_idx) {
-  if (!skin || !skin.joints || joint_idx >= skin.joints.length) return -1
+  if (!skin || !skin.joints || joint_idx >= length(skin.joints)) return -1
   return skin.joints[joint_idx]
 }