Körperbewegung

mods/character_anim/workaround.lua

@@ -0,0 +1,54 @@
+-- See https://github.com/luanti-org/luanti/issues/15692
+
+local mod = modlib.mod
+local b3d = modlib.b3d
+
+local media_paths = modlib.minetest.media.paths
+
+local function is_perfect(quat)
+	local mat = modlib.matrix4.rotation(quat)
+	local diag_abs_sum = 0
+	for i = 1, 3 do
+		diag_abs_sum = diag_abs_sum + math.abs(mat[i][i])
+	end
+	return math.abs(diag_abs_sum - 3) < 1e-5
+end
+
+return function(name)
+	local stream = assert(io.open(media_paths[name], "rb"))
+	local character = assert(b3d.read(stream))
+	stream:close()
+
+	local function wiggle_rotation(quat)
+		if math.abs(quat[1]) + math.abs(quat[2]) + math.abs(quat[3]) < 1e-5 then return quat end -- identity
+		if not is_perfect(quat) then return quat end
+		local wiggled = {}
+		for i = 1, 4 do
+			wiggled[i] = quat[i] + 1e-3
+		end
+		wiggled = modlib.quaternion.normalize(wiggled)
+		if not is_perfect(wiggled) then return wiggled end
+		for i = 1, 4 do
+			wiggled[i] = quat[i] - 1e-3
+		end
+		wiggled = modlib.quaternion.normalize(wiggled)
+		if not is_perfect(wiggled) then return wiggled end
+		return quat -- this shouldn't happen
+	end
+
+	local function wiggle_rotations(node)
+		node.rotation = wiggle_rotation(node.rotation)
+		node.keys = {}
+		for _, child in ipairs(node.children) do
+			wiggle_rotations(child)
+		end
+	end
+
+	wiggle_rotations(character.node)
+
+	local rope = {}
+	character:write({write = function(_, str)
+		table.insert(rope, str)
+	end})
+	return table.concat(rope)
+end