diff --git a/include/minecraft_data.inc b/include/minecraft_data.inc
index 029829b..33db70e 100644
--- a/include/minecraft_data.inc
+++ b/include/minecraft_data.inc
@@ -16,4 +16,5 @@ struct {
   {1164, 36}, // fence.obj
   {1200, 36}, // torch.obj
   {1236, 24}, // wheat.obj
+  {1260, 1584}, // custom-mushroom.obj
 };
diff --git a/minecraft/configuration.idx b/minecraft/configuration.idx
index c9e0a02..82fa267 100644
Binary files a/minecraft/configuration.idx and b/minecraft/configuration.idx differ
diff --git a/minecraft/gen/custom-mushroom.obj b/minecraft/gen/custom-mushroom.obj
new file mode 100644
index 0000000..6306d2d
--- /dev/null
+++ b/minecraft/gen/custom-mushroom.obj
@@ -0,0 +1,853 @@
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+# www.blender.org
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diff --git a/minecraft/gen/mc.py b/minecraft/gen/mc.py
index 88e5d83..6fd4034 100644
--- a/minecraft/gen/mc.py
+++ b/minecraft/gen/mc.py
@@ -22,11 +22,11 @@ def wrap_n(nc, chunk_c):
         chunk_c = chunk_c + 1
     return nc, chunk_c
 
+# check vertex_buffer.py for model order
 custom_blocks = [
     { # "tallgrass" model
         data.BlockID.TALL_GRASS,
         data.BlockID.MUSHROOM_1,
-        data.BlockID.MUSHROOM_2,
         data.BlockID.FLOWER,
         data.BlockID.ROSE,
         data.BlockID.SAPLING,
@@ -40,6 +40,9 @@ custom_blocks = [
     { # "wheat" model
         data.BlockID.WHEAT,
     },
+    { # "custom-mushroom" model
+        data.BlockID.MUSHROOM_2,
+    },
 ]
 
 non_solid_blocks = set(chain.from_iterable(custom_blocks))
diff --git a/minecraft/gen/tallgrass.obj b/minecraft/gen/tallgrass.obj
index 32a4995..1ebe21b 100644
--- a/minecraft/gen/tallgrass.obj
+++ b/minecraft/gen/tallgrass.obj
@@ -1,22 +1,22 @@
 # Blender 5.0.0
 # www.blender.org
 o TallGrass
-v 0.800000 0.600000 0.800000
-v 0.800000 -1.000000 0.800000
-v -0.800000 -1.000000 0.800000
-v -0.800000 0.600000 0.800000
-v -0.800000 0.600000 -0.800000
-v -0.800000 -1.000000 -0.800000
-v 0.800000 -1.000000 -0.800000
-v 0.800000 0.600000 -0.800000
+v 1.000000 1.000000 1.000000
+v 1.000000 -1.000000 1.000000
+v -1.000000 -1.000000 1.000000
+v -1.000000 1.000000 1.000000
+v -1.000000 1.000000 -1.000000
+v -1.000000 -1.000000 -1.000000
+v 1.000000 -1.000000 -1.000000
+v 1.000000 1.000000 -1.000000
 vn 0.7071 -0.0000 0.7071
 vn 0.7071 -0.0000 -0.7071
-vt 1.000000 1.000000
 vt 0.000000 -0.000000
-vt 1.000000 0.000000
 vt 1.000000 1.000000
 vt -0.000000 1.000000
+vt 0.000000 -0.000000
 vt 1.000000 0.000000
+vt -0.000000 1.000000
 s 0
 f 3/1/1 8/2/1 4/3/1
 f 5/2/2 2/4/2 6/5/2
diff --git a/minecraft/gen/torch.obj b/minecraft/gen/torch.obj
index a619440..dd57590 100644
--- a/minecraft/gen/torch.obj
+++ b/minecraft/gen/torch.obj
@@ -15,16 +15,16 @@ vn -1.0000 -0.0000 -0.0000
 vn -0.0000 -1.0000 -0.0000
 vn 1.0000 -0.0000 -0.0000
 vn -0.0000 -0.0000 -1.0000
-vt 0.531250 0.406250
-vt 0.468750 0.468750
-vt 0.468750 0.406250
-vt 0.437500 0.375000
-vt 0.562500 1.000000
-vt 0.437500 1.000000
-vt 0.562500 0.875000
-vt 0.437500 0.875000
-vt 0.531250 0.468750
-vt 0.562500 0.375000
+vt 0.468750 0.593750
+vt 0.531250 0.531250
+vt 0.531250 0.593750
+vt 0.562500 0.625000
+vt 0.437500 0.000000
+vt 0.562500 0.000000
+vt 0.437500 0.125000
+vt 0.562500 0.125000
+vt 0.468750 0.531250
+vt 0.437500 0.625000
 s 0
 f 5/1/1 3/2/1 1/3/1
 f 3/4/2 8/5/2 4/6/2
diff --git a/minecraft/gen/vertex_buffer.py b/minecraft/gen/vertex_buffer.py
index 0e4cab3..c6c23b5 100644
--- a/minecraft/gen/vertex_buffer.py
+++ b/minecraft/gen/vertex_buffer.py
@@ -14,7 +14,7 @@ normals = [
     (1.0, 0.0, 0.0),
 ]
 
-def build_configuration_index_buffers(f, faces_by_normal, index_buffer):
+def build_configuration_index_buffers(faces_by_normal, index_buffer):
     assert(set(normals) == set(faces_by_normal.keys()))
 
     offset = 0
@@ -27,7 +27,7 @@ def build_configuration_index_buffers(f, faces_by_normal, index_buffer):
             normal = normals[i]
             indices = faces_by_normal[normal]
             for index in indices:
-                f.write(struct.pack("<B", index))
+                #f.write(struct.pack("<B", index))
                 index_buffer.append(index)
                 offset += 1
 
@@ -47,14 +47,16 @@ def main():
     obj_state.append_triangles(cube_state, vertex_buffer, tmp_index_buffer, index_lookup)
     cube_faces_by_normal = obj_state.build_faces_by_normal(vertex_buffer, tmp_index_buffer)
 
-    build_configuration_index_buffers(f, cube_faces_by_normal, index_buffer)
+    build_configuration_index_buffers(cube_faces_by_normal, index_buffer)
+    # check mc.py `custom_blocks` for model order
     obj_write.write_obj(vertex_buffer, index_buffer, index_lookup, "tallgrass.obj")
     obj_write.write_obj(vertex_buffer, index_buffer, index_lookup, "fence.obj")
     obj_write.write_obj(vertex_buffer, index_buffer, index_lookup, "torch.obj")
     obj_write.write_obj(vertex_buffer, index_buffer, index_lookup, "wheat.obj")
+    obj_write.write_obj(vertex_buffer, index_buffer, index_lookup, "custom-mushroom.obj")
 
     with open("../configuration.idx", "wb") as f:
-        obj_write.write_indices(f, "<B", index_buffer)
+        obj_write.write_indices(f, "<H", index_buffer)
 
     with open("../per_vertex.vtx", "wb") as f:
         obj_write.write_vertex_buffer(f, vertex_buffer)
diff --git a/minecraft/gen/wheat.obj b/minecraft/gen/wheat.obj
index 89c118a..412ae23 100644
--- a/minecraft/gen/wheat.obj
+++ b/minecraft/gen/wheat.obj
@@ -1,22 +1,22 @@
 # Blender 5.0.0
 # www.blender.org
 o Cube
-v -0.500000 -1.000000 -1.000000
-v -0.500000 1.000000 -1.000000
-v 1.000000 -1.000000 0.500000
-v 1.000000 1.000000 0.500000
-v 0.500000 1.000000 -1.000000
-v 0.500000 -1.000000 -1.000000
-v 0.500000 1.000000 1.000000
-v 0.500000 -1.000000 1.000000
-v 1.000000 1.000000 -0.500000
-v 1.000000 -1.000000 -0.500000
-v -1.000000 1.000000 -0.500000
-v -1.000000 -1.000000 -0.500000
 v -0.500000 1.000000 1.000000
 v -0.500000 -1.000000 1.000000
 v -1.000000 1.000000 0.500000
 v -1.000000 -1.000000 0.500000
+v 0.500000 -1.000000 1.000000
+v 0.500000 1.000000 1.000000
+v 0.500000 -1.000000 -1.000000
+v 0.500000 1.000000 -1.000000
+v -1.000000 -1.000000 -0.500000
+v -1.000000 1.000000 -0.500000
+v 1.000000 -1.000000 -0.500000
+v 1.000000 1.000000 -0.500000
+v -0.500000 -1.000000 -1.000000
+v -0.500000 1.000000 -1.000000
+v 1.000000 -1.000000 0.500000
+v 1.000000 1.000000 0.500000
 vn -0.0000 -0.0000 1.0000
 vn 1.0000 -0.0000 -0.0000
 vn -0.0000 -0.0000 -1.0000
diff --git a/minecraft/per_vertex.vtx b/minecraft/per_vertex.vtx
index f98518d..4a1da3b 100644
Binary files a/minecraft/per_vertex.vtx and b/minecraft/per_vertex.vtx differ
diff --git a/minecraft/region.-1.-1.instance.cfg b/minecraft/region.-1.-1.instance.cfg
index 1034088..ef07337 100644
Binary files a/minecraft/region.-1.-1.instance.cfg and b/minecraft/region.-1.-1.instance.cfg differ
diff --git a/minecraft/region.-1.-1.instance.vtx b/minecraft/region.-1.-1.instance.vtx
index 5d73e38..43f3c6c 100644
Binary files a/minecraft/region.-1.-1.instance.vtx and b/minecraft/region.-1.-1.instance.vtx differ
diff --git a/minecraft/region.-1.0.instance.cfg b/minecraft/region.-1.0.instance.cfg
index be3db08..a0c115e 100644
Binary files a/minecraft/region.-1.0.instance.cfg and b/minecraft/region.-1.0.instance.cfg differ
diff --git a/minecraft/region.-1.0.instance.vtx b/minecraft/region.-1.0.instance.vtx
index 81f7c4e..07df6c6 100644
Binary files a/minecraft/region.-1.0.instance.vtx and b/minecraft/region.-1.0.instance.vtx differ
diff --git a/minecraft/region.0.-1.instance.cfg b/minecraft/region.0.-1.instance.cfg
index dab0192..4c500e3 100644
Binary files a/minecraft/region.0.-1.instance.cfg and b/minecraft/region.0.-1.instance.cfg differ
diff --git a/minecraft/region.0.-1.instance.vtx b/minecraft/region.0.-1.instance.vtx
index 99e4c8f..90ec40b 100644
Binary files a/minecraft/region.0.-1.instance.vtx and b/minecraft/region.0.-1.instance.vtx differ
diff --git a/minecraft/region.0.0.instance.cfg b/minecraft/region.0.0.instance.cfg
index f190cc4..90f60d5 100644
Binary files a/minecraft/region.0.0.instance.cfg and b/minecraft/region.0.0.instance.cfg differ
diff --git a/minecraft/region.0.0.instance.vtx b/minecraft/region.0.0.instance.vtx
index 910d61d..b6c0c3b 100644
Binary files a/minecraft/region.0.0.instance.vtx and b/minecraft/region.0.0.instance.vtx differ
diff --git a/shader/minecraft.frag b/shader/minecraft.frag
index 34c6fd5..89103a6 100644
--- a/shader/minecraft.frag
+++ b/shader/minecraft.frag
@@ -51,7 +51,7 @@ void main()
   int terrain_x = terrain_ix % 16;
   int terrain_y = terrain_ix / 16;
   ivec2 coord = ivec2(terrain_x, terrain_y) * 16;
-  coord += ivec2(fs_in.Texture.xy * 16.0);
+  coord += ivec2(vec2(fs_in.Texture.x, 1.0 - fs_in.Texture.y) * 16.0);
 
   vec4 texture_color = texelFetch(TerrainSampler, coord, 0);
   if (texture_color.w != 1.0) {
diff --git a/src/inthash.c b/src/inthash.c
index fa28805..19444a4 100644
--- a/src/inthash.c
+++ b/src/inthash.c
@@ -1,3 +1,4 @@
+/* BDZ */
 /* generated with rurban/nbperf v3.1-0-g4379d4d -I <stdin> */
 /* seed[0]: 1469348094, seed[1]: 1956297539 */
 #include <stdint.h>
diff --git a/src/minecraft.cpp b/src/minecraft.cpp
index c161ea8..064a38c 100644
--- a/src/minecraft.cpp
+++ b/src/minecraft.cpp
@@ -58,7 +58,7 @@ namespace minecraft {
   static unsigned int index_buffer;
 
   // also update index_buffer_custom_offsets in data.inc
-  static const int custom_block_types = 4;
+  static const int custom_block_types = 5;
   static const int instance_cfg_length = 64 + custom_block_types;
 
   struct instance_cfg {
@@ -299,7 +299,7 @@ namespace minecraft {
       //////////////////////////////////////////////////////////////////////
       for (int configuration = 1; configuration < 64; configuration++) {
         int element_count = 6 * popcount(configuration);
-        const void * indices = (void *)((ptrdiff_t)index_buffer_configuration_offsets[configuration]); // index into configuration.idx
+        const void * indices = (void *)(2 * (ptrdiff_t)index_buffer_configuration_offsets[configuration]); // index into configuration.idx
 
         int instance_count = instance_cfg[region_index].cfg[configuration].instance_count;
         int base_instance = instance_cfg[region_index].cfg[configuration].offset / per_instance_size; // index into region.0.0.instance.vtx
@@ -307,7 +307,7 @@ namespace minecraft {
         if (instance_count == 0)
           continue;
 
-        glDrawElementsInstancedBaseInstance(GL_TRIANGLES, element_count, GL_UNSIGNED_BYTE, indices, instance_count, base_instance);
+        glDrawElementsInstancedBaseInstance(GL_TRIANGLES, element_count, GL_UNSIGNED_SHORT, indices, instance_count, base_instance);
       }
 
       //////////////////////////////////////////////////////////////////////
@@ -315,12 +315,12 @@ namespace minecraft {
       //////////////////////////////////////////////////////////////////////
       for (int i = 0; i < custom_block_types; i++) {
         int element_count = index_buffer_custom_offsets[i].count;
-        const void * indices = (void *)((ptrdiff_t)index_buffer_custom_offsets[i].offset);
+        const void * indices = (void *)(2 * (ptrdiff_t)index_buffer_custom_offsets[i].offset);
         int instance_count = instance_cfg[region_index].cfg[64 + i].instance_count;
         int base_instance = instance_cfg[region_index].cfg[64 + i].offset / per_instance_size; // index into region.0.0.instance.vtx
         if (instance_count == 0)
           continue;
-        glDrawElementsInstancedBaseInstance(GL_TRIANGLES, element_count, GL_UNSIGNED_BYTE, indices, instance_count, base_instance);
+        glDrawElementsInstancedBaseInstance(GL_TRIANGLES, element_count, GL_UNSIGNED_SHORT, indices, instance_count, base_instance);
       }
     }
   }