From f890e4e5504f8cca78676b6fc240fe0e6ce20987 Mon Sep 17 00:00:00 2001
From: Zack Buhman <zack@buhman.org>
Date: Sat, 7 Mar 2026 21:01:35 -0600
Subject: [PATCH] minecraft: custom meshes for torch and fence

---
 include/data.inc                    |   8 +++
 minecraft/configuration.idx         | Bin 1164 -> 1236 bytes
 minecraft/gen/fence.obj             |  48 ++++++++++++++++++
 minecraft/gen/mc.py                 |  75 ++++++++++++++++------------
 minecraft/gen/torch.obj             |  40 +++++++++++++++
 minecraft/gen/vertex_buffer.py      |  33 ++++++++----
 minecraft/per_vertex.vtx            | Bin 512 -> 1280 bytes
 minecraft/region.-1.-1.instance.cfg | Bin 520 -> 536 bytes
 minecraft/region.-1.-1.instance.vtx | Bin 5260952 -> 5261248 bytes
 minecraft/region.-1.0.instance.cfg  | Bin 520 -> 536 bytes
 minecraft/region.-1.0.instance.vtx  | Bin 5680672 -> 5680840 bytes
 minecraft/region.0.-1.instance.cfg  | Bin 520 -> 536 bytes
 minecraft/region.0.0.instance.cfg   | Bin 520 -> 536 bytes
 minecraft/region.0.0.instance.vtx   | Bin 6127680 -> 6127888 bytes
 src/test.cpp                        |  15 +++---
 15 files changed, 170 insertions(+), 49 deletions(-)
 create mode 100644 minecraft/gen/fence.obj
 create mode 100644 minecraft/gen/torch.obj

diff --git a/include/data.inc b/include/data.inc
index b6bef8b..c7e97c3 100644
--- a/include/data.inc
+++ b/include/data.inc
@@ -8,3 +8,11 @@ short index_buffer_configuration_offsets[] = {
   768,  780,  798,  816,  840,  858,  882,  906,
   936,  954,  978, 1002, 1032, 1056, 1086, 1116,
 };
+struct {
+  short offset;
+  short count;
+} index_buffer_custom_offsets[] = {
+  {1152, 12}, // tallgrass.obj
+  {1164, 36}, // fence.obj
+  {1200, 36}, // torch.obj
+};
diff --git a/minecraft/configuration.idx b/minecraft/configuration.idx
index 58df8cc2522c8352b95bda36383c9a2cebf74fd6..9dd0708fb1be37f4a9ac84f8cb35110ec0d3ae33 100644
GIT binary patch
delta 80
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delta 7
Ocmcb@*~7V^hXnu(6#}yW

diff --git a/minecraft/gen/fence.obj b/minecraft/gen/fence.obj
new file mode 100644
index 0000000..0b05179
--- /dev/null
+++ b/minecraft/gen/fence.obj
@@ -0,0 +1,48 @@
+# Blender 5.0.0
+# www.blender.org
+o Cube
+v 0.250000 1.000000 -0.250000
+v 0.250000 -1.000000 -0.250000
+v 0.250000 1.000000 0.250000
+v 0.250000 -1.000000 0.250000
+v -0.250000 1.000000 -0.250000
+v -0.250000 -1.000000 -0.250000
+v -0.250000 1.000000 0.250000
+v -0.250000 -1.000000 0.250000
+vn -0.0000 1.0000 -0.0000
+vn -0.0000 -0.0000 1.0000
+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 0.250000 1.250000
+vt 0.500000 1.000000
+vt 0.500000 1.250000
+vt 0.250050 0.000100
+vt 0.500000 0.999900
+vt 0.250050 0.999900
+vt 0.500000 0.000100
+vt 0.749950 0.999900
+vt 0.250000 0.000000
+vt 0.500000 -0.250000
+vt 0.500000 0.000000
+vt 0.000100 0.000100
+vt 0.000100 0.999900
+vt 0.749950 0.000100
+vt 0.999900 0.999900
+vt 0.250000 1.000000
+vt 0.250000 -0.250000
+vt 0.999900 0.000100
+s 0
+f 5/1/1 3/2/1 1/3/1
+f 3/4/2 8/5/2 4/6/2
+f 7/7/3 6/8/3 8/5/3
+f 2/9/4 8/10/4 6/11/4
+f 1/12/5 4/6/5 2/13/5
+f 5/14/6 2/15/6 6/8/6
+f 5/1/1 7/16/1 3/2/1
+f 3/4/2 7/7/2 8/5/2
+f 7/7/3 5/14/3 6/8/3
+f 2/9/4 4/17/4 8/10/4
+f 1/12/5 3/4/5 4/6/5
+f 5/14/6 1/18/6 2/15/6
diff --git a/minecraft/gen/mc.py b/minecraft/gen/mc.py
index b77c26d..5149a5c 100644
--- a/minecraft/gen/mc.py
+++ b/minecraft/gen/mc.py
@@ -4,12 +4,15 @@ from pprint import pprint
 from itertools import chain
 from collections import defaultdict
 import functools
+import os
 
 import mcregion
 import vec3
 import vertex_buffer
 import data
 
+FAST = "FAST" in os.environ
+
 def wrap_n(nc, chunk_c):
     if nc < 0:
         nc = 15
@@ -19,14 +22,24 @@ def wrap_n(nc, chunk_c):
         chunk_c = chunk_c + 1
     return nc, chunk_c
 
-non_solid_blocks = {
-    data.BlockID.TALL_GRASS,
-    data.BlockID.MUSHROOM_1,
-    data.BlockID.MUSHROOM_2,
-    data.BlockID.FLOWER,
-    data.BlockID.ROSE,
-    data.BlockID.SAPLING,
-}
+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,
+    },
+    { # "fence" model
+        data.BlockID.FENCE,
+    },
+    { # "torch" model
+        data.BlockID.TORCH,
+    },
+]
+
+non_solid_blocks = set(chain.from_iterable(custom_blocks))
 
 def neighbor_exists(level_table, chunk_x, chunk_z, nx, ny, nz):
     if ny > 127 or ny < 0:
@@ -67,6 +80,8 @@ def devoxelize_region(level_table, level_table_keys):
     for chunk_x, chunk_z in level_table_keys:
         for block_index in range(128 * 16 * 16):
             yield from block_neighbors(level_table, chunk_x, chunk_z, block_index)
+        if FAST:
+            return
 
 def build_level_table(level_table, mem, locations):
     for location in locations:
@@ -92,15 +107,6 @@ def build_block_configuration_table():
                 indices.extend(vertex_buffer.faces_by_normal[vertex_buffer.normals[j]])
         yield indices
 
-non_cube_blocks = {
-    data.BlockID.TALL_GRASS,
-    data.BlockID.MUSHROOM_1,
-    data.BlockID.MUSHROOM_2,
-    data.BlockID.FLOWER,
-    data.BlockID.ROSE,
-    data.BlockID.SAPLING,
-}
-
 def pack_instance_data(position, block_id):
     packed = struct.pack("<hhhBB",
                          position[0], position[1], position[2],
@@ -111,11 +117,18 @@ def pack_instance_data(position, block_id):
 def build_block_instances(blocks):
     by_configuration = defaultdict(list)
 
-    deferred_blocks = []
+    deferred_blocks = defaultdict(list)
+
+    def is_deferred_block(position, block_id):
+        for i, custom_block_types in enumerate(custom_blocks):
+            if block_id in custom_block_types:
+                deferred_blocks[i].append((position, block_id))
+                return True
+        return False
 
     for position, block_id, normal_indices in blocks:
-        if block_id in non_cube_blocks:
-            deferred_blocks.append((position, block_id))
+        if is_deferred_block(position, block_id):
+            assert block_id in non_solid_blocks
             continue
         configuration = normal_indices_as_block_configuration(normal_indices)
         by_configuration[configuration].append((position, block_id))
@@ -133,7 +146,7 @@ def build_block_instances(blocks):
             _blocks = by_configuration[configuration]
             configuration_instance_count_offset.append((len(_blocks), offset))
             for position, block_id in _blocks:
-                assert block_id not in non_cube_blocks, block_id
+                assert block_id not in non_solid_blocks, block_id
                 packed = pack_instance_data(position, block_id)
                 f.write(packed)
                 offset += len(packed)
@@ -141,16 +154,16 @@ def build_block_instances(blocks):
         ######################################################################
         # non-cubes
         ######################################################################
-        nc_offset = offset
-        nc_instance_count = 0
-        for position, block_id in deferred_blocks:
-            if block_id not in non_cube_blocks:
-                continue
-            packed = pack_instance_data(position, block_id)
-            f.write(packed)
-            offset += len(packed)
-            nc_instance_count += 1
-        configuration_instance_count_offset.append((nc_instance_count, nc_offset))
+        for custom_block_ix in range(len(custom_blocks)):
+            nc_offset = offset
+            nc_instance_count = 0
+            for position, block_id in deferred_blocks[custom_block_ix]:
+                assert block_id in non_solid_blocks, block_id
+                packed = pack_instance_data(position, block_id)
+                f.write(packed)
+                offset += len(packed)
+                nc_instance_count += 1
+            configuration_instance_count_offset.append((nc_instance_count, nc_offset))
 
     with open(f"{data_path}.instance.cfg", "wb") as f:
         for instance_count, offset in configuration_instance_count_offset:
diff --git a/minecraft/gen/torch.obj b/minecraft/gen/torch.obj
new file mode 100644
index 0000000..a619440
--- /dev/null
+++ b/minecraft/gen/torch.obj
@@ -0,0 +1,40 @@
+# Blender 5.0.0
+# www.blender.org
+o Cube
+v 0.125000 0.250000 -0.125000
+v 0.125000 -1.000000 -0.125000
+v 0.125000 0.250000 0.125000
+v 0.125000 -1.000000 0.125000
+v -0.125000 0.250000 -0.125000
+v -0.125000 -1.000000 -0.125000
+v -0.125000 0.250000 0.125000
+v -0.125000 -1.000000 0.125000
+vn -0.0000 1.0000 -0.0000
+vn -0.0000 -0.0000 1.0000
+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
+s 0
+f 5/1/1 3/2/1 1/3/1
+f 3/4/2 8/5/2 4/6/2
+f 7/4/3 6/5/3 8/6/3
+f 2/7/4 8/6/4 6/8/4
+f 1/4/5 4/5/5 2/6/5
+f 5/4/6 2/5/6 6/6/6
+f 5/1/1 7/9/1 3/2/1
+f 3/4/2 7/10/2 8/5/2
+f 7/4/3 5/10/3 6/5/3
+f 2/7/4 4/5/4 8/6/4
+f 1/4/5 3/10/5 4/5/5
+f 5/4/6 1/10/6 2/5/6
diff --git a/minecraft/gen/vertex_buffer.py b/minecraft/gen/vertex_buffer.py
index 93a5d88..6669193 100644
--- a/minecraft/gen/vertex_buffer.py
+++ b/minecraft/gen/vertex_buffer.py
@@ -13,7 +13,7 @@ normals = [
     (1.0, 0.0, 0.0),
 ]
 
-def build_configuration_index_buffers(f, faces_by_normal):
+def build_configuration_index_buffers(f, faces_by_normal, index_buffer):
     assert(set(normals) == set(faces_by_normal.keys()))
 
     offset = 0
@@ -27,6 +27,7 @@ def build_configuration_index_buffers(f, faces_by_normal):
             indices = faces_by_normal[normal]
             for index in indices:
                 f.write(struct.pack("<B", index))
+                index_buffer.append(index)
                 offset += 1
 
     for i, offset in enumerate(configuration_offsets):
@@ -43,25 +44,35 @@ def write_indices(f, index_buffer, start, count):
     for i in range(count):
         f.write(struct.pack("<B", index_buffer[start + i]))
 
+def write_custom_obj(f, vertex_buffer, index_buffer, index_lookup, path):
+    index_start = len(index_buffer)
+    state = obj.parse_obj_from_filename(path)
+    obj_state.append_triangles(state, vertex_buffer, index_buffer, index_lookup)
+    index_count = len(index_buffer) - index_start
+    write_indices(f, index_buffer, index_start, index_count)
+    print(f"{index_start}, {index_count}, // {path}")
+
 def main():
+    cube_index_buffer = []
+    cube_index_lookup = {}
+
     vertex_buffer = []
     index_buffer = []
     index_lookup = {}
 
     cube_state = obj.parse_obj_from_filename("cube.obj")
 
-    obj_state.append_triangles(cube_state, vertex_buffer, index_buffer, index_lookup)
-    cube_faces_by_normal = obj_state.build_faces_by_normal(vertex_buffer, index_buffer)
-
-    tallgrass_index_start = len(index_buffer)
-    tallgrass_state = obj.parse_obj_from_filename("tallgrass.obj")
-    obj_state.append_triangles(tallgrass_state, vertex_buffer, index_buffer, index_lookup)
-    tallgrass_index_count = len(index_buffer) - tallgrass_index_start
-    print(tallgrass_index_start, tallgrass_index_count)
+    obj_state.append_triangles(cube_state, vertex_buffer, cube_index_buffer, cube_index_lookup)
+    cube_faces_by_normal = obj_state.build_faces_by_normal(vertex_buffer, cube_index_buffer)
 
     with open("../configuration.idx", "wb") as f:
-        build_configuration_index_buffers(f, cube_faces_by_normal)
-        write_indices(f, index_buffer, tallgrass_index_start, tallgrass_index_count)
+        build_configuration_index_buffers(f, cube_faces_by_normal, index_buffer)
+        index_lookup = {}
+        write_custom_obj(f, vertex_buffer, index_buffer, index_lookup, "tallgrass.obj")
+        index_lookup = {}
+        write_custom_obj(f, vertex_buffer, index_buffer, index_lookup, "fence.obj")
+        index_lookup = {}
+        write_custom_obj(f, vertex_buffer, index_buffer, index_lookup, "torch.obj")
 
     with open("../per_vertex.vtx", "wb") as f:
         build_vertex_buffer(f, vertex_buffer)
diff --git a/minecraft/per_vertex.vtx b/minecraft/per_vertex.vtx
index 497b4a4084ed2f1fa008839546de15d6ac16f60a..bf18c313c39d8293312d098cb18f9b82a850c4a0 100644
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diff --git a/minecraft/region.-1.-1.instance.cfg b/minecraft/region.-1.-1.instance.cfg
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diff --git a/minecraft/region.-1.-1.instance.vtx b/minecraft/region.-1.-1.instance.vtx
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diff --git a/minecraft/region.-1.0.instance.cfg b/minecraft/region.-1.0.instance.cfg
index a50501e6b295ebf3277e945a3b505e35d106d2ea..e59d84ba902100571e76693dedbddfde9f7a140a 100644
GIT binary patch
literal 536
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literal 520
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diff --git a/minecraft/region.-1.0.instance.vtx b/minecraft/region.-1.0.instance.vtx
index c678e5724f3dae1a42432187254ede6e1a6ffb44..dc3f540fd83e1467f5d0d75143a64ad708c2b0f4 100644
GIT binary patch
delta 812
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delta 706
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S=HUt~z*Sgef!%9;Z~p*US^A^^

diff --git a/minecraft/region.0.-1.instance.cfg b/minecraft/region.0.-1.instance.cfg
index f74e23d9f4d1d6bb409b6176094467463828d52b..774146baf22101d9454d81ca8f30b40912325a2f 100644
GIT binary patch
delta 24
YcmeBRnZdGwgGqn^2n<3aKopn;05$3ZtpET3

delta 7
OcmbQi(!sKUg9!i$Apzq6

diff --git a/minecraft/region.0.0.instance.cfg b/minecraft/region.0.0.instance.cfg
index 150cbfdcce7c5844cd79097dba6007387c7c3132..c913078bf2b028206a8dc27e10eb575ce3a60a27 100644
GIT binary patch
literal 536
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literal 520
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diff --git a/minecraft/region.0.0.instance.vtx b/minecraft/region.0.0.instance.vtx
index d6c02eb4baa69e29a80aafcb5284802cbe830aec..033158d3d4e84ac7953e643faad999111f7a061b 100644
GIT binary patch
delta 1729
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delta 1554
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diff --git a/src/test.cpp b/src/test.cpp
index f4e794f..c3d900c 100644
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -49,7 +49,8 @@ static unsigned int per_vertex_buffer;
 static const int vertex_size = 8;
 static const int per_vertex_size = (3 + 3 + 2) * 2;
 
-static const int instance_cfg_length = 64 + 1;
+static const int custom_block_types = 3;
+static const int instance_cfg_length = 64 + custom_block_types;
 
 struct instance_cfg {
   struct region_instance {
@@ -327,13 +328,13 @@ void draw()
     }
 
     //////////////////////////////////////////////////////////////////////
-    // non-cube blocks
+    // custom blocks
     //////////////////////////////////////////////////////////////////////
-    {
-      int element_count = 6 * 2;
-      const void * indices = (void *)((ptrdiff_t)1152);
-      int instance_count = instance_cfg[region_index].cfg[64].instance_count;
-      int base_instance = instance_cfg[region_index].cfg[64].offset / vertex_size; // index into region.0.0.instance.vtx
+    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);
+      int instance_count = instance_cfg[region_index].cfg[64 + i].instance_count;
+      int base_instance = instance_cfg[region_index].cfg[64 + i].offset / vertex_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);