Add the intro cutscene, a start to the map, and various other things.

mods/artifact_characters/vix.lua

@@ -0,0 +1,99 @@
+local ns = artifact
+
+minetest.register_entity(":artifact:burst", {
+    initial_properties = {
+        visual = "sprite",
+        textures = {"blank.png"},
+        pointable = false,
+        physical = true,
+        collide_with_objects = false,
+        collisionbox = {
+            -0.2, -0.2, -0.2,
+            0.2, 0.2, 0.2
+        },
+        static_save = false,
+    },
+    on_activate = function(e, rot)
+        e.object:set_armor_groups{immortal = 1}
+    end,
+    on_deactivate = function(e)
+        for _, x in ipairs(e._particles) do
+            minetest.delete_particlespawner(x)
+        end
+    end,
+    on_step = function(e, dtime, movement)
+        if movement.collides then
+            minetest.add_particlespawner {
+                pos = e.object:get_pos(),
+                radius = 0.1,
+                texture = {
+                    name = "artifact_light.png",
+                    alpha_tween = {1, 0}
+                },
+                glow = 8,
+                size_tween = {
+                    {min = 2, max = 3},
+                    {min = 4, max = 5}
+                },
+                attract = {
+                    kind = "point",
+                    strength = {
+                        min = -50,
+                        max = -20,
+                    },
+                    origin = e.object:get_pos()
+                },
+                amount = 25,
+                exptime = 0.5,
+                drag = 1,
+                time = 0.1,
+            }
+            e.object:remove()
+        end
+    end,
+    impulse = function(e, vel)
+        -- The documentation said that `vel` is relative to the parent entity...
+        -- I guess the documentation is wrong?
+        local rot = vel:normalize():dir_to_rotation()
+        local min, max = vector.sort(vector.new(-1,-1,-1):rotate(rot), vector.new(1,1,0):rotate(rot))
+        e._particles = {
+            -- Tail
+            minetest.add_particlespawner {
+                attached = e.object,
+                pos = {
+                    min = vector.new(-1,-1,-1) *0.2,
+                    max = vector.new(1,1,1) *0.2
+                },
+                vel = {
+                    min = min,
+                    max = max
+                },
+                texture = {
+                    name = "artifact_light.png",
+                    alpha_tween = {1, 0}
+                },
+                size = 0.4,
+                glow = 10,
+                amount = 450,
+                time = 0
+            },
+            -- Head
+            minetest.add_particlespawner {
+                attached = e.object,
+                pos = vector.zero(),
+                vel = vel,
+                texture = "[fill:16x16:0,0:#fff",
+                size = 3,
+                glow = 14,
+                amount = 150,
+                time = 0,
+                exptime = 0.1
+            }
+        }
+        e.object:set_velocity(vel)
+    end
+})
+
+function ns.do_shoot(m)
+    minetest.add_entity(m.pos +m.dir, "artifact:burst", tostring(m.yaw)):get_luaentity():impulse(m.dir *30)
+end