write something there

mods/minetest_game/player_api/init.lua

@@ -0,0 +1,26 @@
+dofile(minetest.get_modpath("player_api") .. "/api.lua")
+
+-- Default player appearance
+player_api.register_model("character.b3d", {
+	animation_speed = 30,
+	textures = {"character.png"},
+	animations = {
+		-- Standard animations.
+		stand     = {x = 0,   y = 79},
+		lay       = {x = 162, y = 166, eye_height = 0.3, override_local = true,
+			collisionbox = {-0.6, 0.0, -0.6, 0.6, 0.3, 0.6}},
+		walk      = {x = 168, y = 187},
+		mine      = {x = 189, y = 198},
+		walk_mine = {x = 200, y = 219},
+		sit       = {x = 81,  y = 160, eye_height = 0.8, override_local = true,
+			collisionbox = {-0.3, 0.0, -0.3, 0.3, 1.0, 0.3}}
+	},
+	collisionbox = {-0.3, 0.0, -0.3, 0.3, 1.7, 0.3},
+	stepheight = 0.6,
+	eye_height = 1.47,
+})
+
+-- Update appearance when the player joins
+minetest.register_on_joinplayer(function(player)
+	player_api.set_model(player, "character.b3d")
+end)