add falling_block entity

res/content/base/content.json

@@ -1,6 +1,8 @@
 {
-  "items": [
-    "bazalt_breaker"
+  "entities": [
+    "drop",
+    "player",
+    "falling_block"
   ],
   "blocks": [
     "dirt",
@@ -28,8 +30,7 @@
     "torch",
     "wooden_door"
   ],
-  "entities": [
-    "drop",
-    "player"
+  "items": [
+    "bazalt_breaker"
   ]
 }

res/content/base/entities/drop.json

@@ -6,7 +6,5 @@
     "sensors": [
         ["aabb", -0.2, -0.2, -0.2, 0.2, 0.2, 0.2],
         ["radius", 1.6]
-    ],
-    "save-rig-textures": true,
-    "save-rig-pose": true
+    ]
 }

res/content/base/entities/falling_block.json

@@ -0,0 +1,7 @@
+{
+    "components": [
+        "falling_block"
+    ],
+    "rig-name": "base:block",
+    "hitbox": [0.4, 0.4, 0.4]
+}

res/content/base/models/block.obj

@@ -0,0 +1,48 @@
+o Cube
+v 0.5 -0.5 -0.5
+v 0.5 -0.5 0.5
+v -0.5 -0.5 0.5
+v -0.5 -0.5 -0.5
+v 0.5 0.5 -0.5
+v 0.5 0.5 0.5
+v -0.5 0.5 0.5
+v -0.5 0.5 -0.5
+vt 0.0 0.0
+vt 1.0 0.0
+vt 1.0 1.0
+vt 0.0 1.0
+vt 0.0 0.0
+vt 1.0 0.0
+vt 1.0 1.0
+vt 0.0 1.0
+vt 1.0 0.0
+vt 1.0 1.0
+vt 0.0 0.0
+vt 1.0 0.0
+vt 0.0 1.0
+vt 0.0 0.0
+vt 0.0 1.0
+vt 1.0 0.0
+vt 1.0 1.0
+vt 1.0 1.0
+vt 0.0 1.0
+vt 0.0 0.0
+vn 0.0 -1.0 0.0
+vn 0.0 1.0 0.0
+vn 1.0 -0.0 0.0
+vn -1.0 -0.0 -0.0
+vn 0.0 0.0 -1.0
+vn -0.0 -0.0 1.0
+usemtl $2
+s off
+f 1/1/1 2/2/1 3/3/1 4/4/1
+usemtl $3
+f 5/5/2 8/6/2 7/7/2 6/8/2
+usemtl $0
+f 1/9/3 5/10/3 6/8/3 2/11/3
+usemtl $1
+f 3/12/4 7/7/4 8/13/4 4/14/4
+usemtl $4
+f 5/15/5 1/1/5 4/16/5 8/17/5
+usemtl $5
+f 2/2/6 6/18/6 7/19/6 3/20/6

res/content/base/preload.json

@@ -5,6 +5,7 @@
         "events/pickup"
     ],
     "models": [
+        "block",
         "drop-block",
         "drop-item"
     ]

res/content/base/rigs/block.json

@@ -0,0 +1,5 @@
+{
+    "root": {
+        "model": "block"
+    }
+}

res/content/base/scripts/components/falling_block.lua

@@ -0,0 +1,31 @@
+local tsf = entity.transform
+local body = entity.rigidbody
+local rig = entity.modeltree
+
+ARGS = ARGS or {}
+local blockid = ARGS.block
+if SAVED_DATA.block then
+    blockid = SAVED_DATA.block
+else
+    SAVED_DATA.block = blockid
+end
+
+do -- setup visuals
+    local textures = block.get_textures(block.index(blockid))
+    for i,t in ipairs(textures) do
+        rig:set_texture("$"..tostring(i-1), "blocks:"..textures[i])
+    end
+end
+
+function on_grounded()
+    local pos = tsf:get_pos()
+    local ix = math.floor(pos[1])
+    local iy = math.floor(pos[2])
+    local iz = math.floor(pos[3])
+    if block.is_replaceable_at(ix, iy, iz) then
+        block.set(ix, iy, iz, block.index(blockid))
+    else
+        entities.spawn("base:drop", pos, {item={id=item.index(blockid..".item"), count=1}}) 
+    end
+    entity:despawn()
+end

res/content/base/scripts/sand.lua

@@ -0,0 +1,14 @@
+local function update(x, y, z)
+    if block.is_replaceable_at(x, y-1, z) then
+        entities.spawn("base:falling_block", {x+0.5, y+0.5, z+0.5}, {block='base:sand'})
+        block.set(x, y, z, 0)
+    end
+end
+
+function on_update(x, y, z)
+    update(x, y, z)
+end
+
+function on_placed(x, y, z)
+    update(x, y, z)
+end

src/content/ContentLoader.cpp

@@ -344,6 +344,8 @@ void ContentLoader::loadEntity(EntityDef& def, const std::string& name, const fs
     if (auto bodyType = BodyType_from(bodyTypeName)) {
         def.bodyType = *bodyType;
     }
+
+    root->str("rig-name", def.rigName);
 }
 
 void ContentLoader::loadEntity(EntityDef& def, const std::string& full, const std::string& name) {