diff --git a/scripts/render.js b/scripts/render.js
index cd09b26..301bb51 100644
--- a/scripts/render.js
+++ b/scripts/render.js
@@ -58,7 +58,7 @@ var attr_map = {
   a_pos: 0,
   a_uv: 1,  
   a_norm: 2,
-  a_bone: 3,
+  a_joint: 3,
   a_weight: 4,
   a_color: 5,
   a_tan: 6,
@@ -361,6 +361,12 @@ function shader_apply_material(shader, material = {}, old = {})
     if (material[p] === old[p]) continue;
     assert(p in material, `shader ${shader.name} has no uniform for ${p}`);
     var s = shader.vs.unimap[p];
+    
+    if (p === 'bones') {
+      render.setunibones(0, s.slot, material[p]);
+      continue;
+    }
+
     shader_unisize[s.size](0, s.slot, material[p]);
   }
   
diff --git a/source/engine/jsffi.c b/source/engine/jsffi.c
index 820aa17..879e706 100644
--- a/source/engine/jsffi.c
+++ b/source/engine/jsffi.c
@@ -675,8 +675,10 @@ sg_bindings js2bind(JSValue v)
 {
   sg_bindings bind = {0};
   JSValue attrib = js_getpropstr(v, "attrib");
-  for (int i = 0; i < js_arrlen(attrib); i++)
+
+  for (int i = 0; i < js_arrlen(attrib); i++) {
     bind.vertex_buffers[i] = *js2sg_buffer(js_getpropidx(attrib,i));
+  }
     
   JSValue index = js_getpropstr(v, "index");
   if (!JS_IsUndefined(index))
@@ -870,19 +872,6 @@ sg_shader js2shader(JSValue v)
   return sh;
 }
 
-#define MAT_POS 0
-#define MAT_UV 1
-#define MAT_NORM 2
-#define MAT_BONE 3
-#define MAT_WEIGHT 4
-#define MAT_COLOR 5
-#define MAT_TAN 6
-#define MAT_ANGLE 7
-#define MAT_WH 8
-#define MAT_ST 9
-#define MAT_PPOS 10
-#define MAT_SCALE 11
-
 static int mat2type(int mat)
 {
   switch(mat) {
@@ -894,8 +883,8 @@ static int mat2type(int mat)
     case MAT_ST:
       return SG_VERTEXFORMAT_FLOAT2;
     case MAT_UV:
-    case MAT_TAN:
       return SG_VERTEXFORMAT_USHORT2N;
+    case MAT_TAN:
       return SG_VERTEXFORMAT_UINT10_N2;
     case MAT_BONE:
       return SG_VERTEXFORMAT_UBYTE4;
@@ -906,7 +895,8 @@ static int mat2type(int mat)
     case MAT_SCALE:
       return SG_VERTEXFORMAT_FLOAT;
   };
-  return 0;
+  
+  return -1;
 }
 
 sg_vertex_layout_state js2layout(JSValue v)
@@ -989,6 +979,11 @@ JSC_CCALL(render_setunivp,
   sg_apply_uniforms(js2number(argv[0]), js2number(argv[1]), SG_RANGE_REF(globalview.vp));
 )
 
+JSC_CCALL(render_setunibones,
+  skin *sk = js2skin(argv[2]);
+  sg_apply_uniforms(js2number(argv[0]), js2number(argv[1]), SG_RANGE_REF(sk->binds));
+)
+
 JSC_CCALL(render_setunim4,
   HMM_Mat4 m = MAT1;
   if (JS_IsArray(js, argv[2])) {
@@ -1146,6 +1141,7 @@ static const JSCFunctionListEntry js_render_funcs[] = {
   MIST_FUNC_DEF(render, setuniv3, 2),
   MIST_FUNC_DEF(render, setuniv, 2),
   MIST_FUNC_DEF(render, spdraw, 2),
+  MIST_FUNC_DEF(render, setunibones, 3),
   MIST_FUNC_DEF(render, setbind, 1),
   MIST_FUNC_DEF(render, setuniproj, 2),
   MIST_FUNC_DEF(render, setuniview, 2),
@@ -2957,11 +2953,15 @@ JSC_SCALL(os_gltf_skin,
   cgltf_parse_file(&options,str,&data);
   cgltf_load_buffers(&options,data,str);
 
+  printf("file %s has %d skins\n", str, data->skins_count);
+
   if (data->skins_count <= 0) {
     ret = (JS_UNDEFINED);
     goto CLEANUP;
   }
 
+  ret = skin2js(make_gltf_skin(data->skins+0));
+
   CLEANUP:
   cgltf_free(data);
 )
diff --git a/source/engine/model.c b/source/engine/model.c
index cfe697f..40a4986 100644
--- a/source/engine/model.c
+++ b/source/engine/model.c
@@ -88,6 +88,7 @@ uint32_t pack_int10_n2(float *norm)
   return ret;
 }
 
+// Pack an array of normals into 
 sg_buffer normal_floats(float *f, int n)
 {
   return float_buffer(f, n);
@@ -126,27 +127,24 @@ sg_buffer accessor2buffer(cgltf_accessor *a, int type)
   cgltf_accessor_unpack_floats(a, vs, n);
 
   switch(type) {
-    case cgltf_attribute_type_position:
+    case MAT_POS:
       return sg_make_buffer(&(sg_buffer_desc){
         .data.ptr = vs,
 	.data.size = sizeof(float)*n
       });
-    case cgltf_attribute_type_normal:
+    case MAT_NORM:
       return normal_floats(vs,n);
-    case cgltf_attribute_type_tangent:
+    case MAT_TAN:
       return normal_floats(vs,n); // TODO: MAKE A TANGENT READER
-      break;
-    case cgltf_attribute_type_color:
+    case MAT_COLOR:
       return ubyten_buffer(vs,n);
-    case cgltf_attribute_type_weights:
+    case MAT_WEIGHT:
       return ubyten_buffer(vs,n);
-    case cgltf_attribute_type_joints:
+    case MAT_BONE:
       return ubyte_buffer(vs,n);
-    case cgltf_attribute_type_texcoord:
+    case MAT_UV:
       return texcoord_floats(vs,n);
-    case cgltf_attribute_type_invalid:
-      break;
-    case 100:
+    case MAT_INDEX:
       return index_buffer(vs,n);
   }
 
diff --git a/source/engine/model.h b/source/engine/model.h
index e3c213d..f254d88 100644
--- a/source/engine/model.h
+++ b/source/engine/model.h
@@ -9,6 +9,20 @@
 #include "texture.h"
 #include "cgltf.h"
 
+#define MAT_POS 0
+#define MAT_UV 1
+#define MAT_NORM 2
+#define MAT_BONE 3
+#define MAT_WEIGHT 4
+#define MAT_COLOR 5
+#define MAT_TAN 6
+#define MAT_ANGLE 7
+#define MAT_WH 8
+#define MAT_ST 9
+#define MAT_PPOS 10
+#define MAT_SCALE 11
+#define MAT_INDEX 100
+
 typedef struct md5joint {
   struct md5joint *parent;
   HMM_Vec4 pos;