diff --git a/entities/weapons/space_gun/projectile.tscn b/entities/weapons/space_gun/projectile.tscn index f760ff9..87037d4 100644 --- a/entities/weapons/space_gun/projectile.tscn +++ b/entities/weapons/space_gun/projectile.tscn @@ -23,11 +23,10 @@ radius = 0.15 script = ExtResource("1_4j1dp") EXPLOSION = ExtResource("2_llml6") -[node name="Trail3D" type="MeshInstance3D" parent="."] +[node name="ProjectileTrail" type="MeshInstance3D" parent="."] material_override = SubResource("StandardMaterial3D_4a265") script = ExtResource("3_ygqbh") -_from_width = 0.15 -_scale_acceleration = 0.5 +_start_width = 0.15 _lifespan = 0.25 _start_color = Color(0, 0.498039, 0.854902, 1) _end_color = Color(1, 1, 1, 0) diff --git a/entities/weapons/space_gun/projectile_trail.gd b/entities/weapons/space_gun/projectile_trail.gd index a5b36bf..60112a3 100644 --- a/entities/weapons/space_gun/projectile_trail.gd +++ b/entities/weapons/space_gun/projectile_trail.gd @@ -14,16 +14,12 @@ # along with this program. If not, see . class_name Trail3D extends MeshInstance3D -var _points : Array = [] # 3D points of trail -var _widths : Array = [] # Calculated widths of trail -var _lifespans : Array = [] # Trail point lifespans +@export var _trail_enabled : bool = true -@export var _trail_enabled : bool = true # Is trail shown? +@export var _start_width : float = 0.5 +@export var _end_width : float = 0.0 -@export var _from_width : float = 0.5 # Starting width -@export var _to_width : float = 0.0 # Ending width - -@export_range(0.5, 1.5) var _scale_acceleration : float = 1.0 # Scaling speed +@export_range(0.5, 1.5) var _scaling_acceleration : float = 0.5 @export var _motion_delta : float = 0.1 # Smoothness of trail @export var _lifespan : float = 1.0 # Duration of trail @@ -31,64 +27,70 @@ var _lifespans : Array = [] # Trail point lifespans @export var _start_color : Color = Color(1.0, 1.0, 1.0, 1.0) # Start color @export var _end_color : Color = Color(1.0, 1.0, 1.0, 1.0) # End color -var _old_pos : Vector3 # Previous pos +var _previous_position : Vector3 +var _points : Array + +class PointData: + var position : Vector3 + var width_0 : Vector3 + var width_1 : Vector3 + var lifespan : float = 0.0 func _append_point() -> void: - _points.append(get_global_transform().origin) - _widths.append([ - get_global_transform().basis.x * _from_width, - get_global_transform().basis.x * _from_width - get_global_transform().basis.x * _to_width - ]) - _lifespans.append(0.0) + var point_data : PointData = PointData.new() + point_data.position = global_position + point_data.width_0 = global_basis.x * _start_width + point_data.width_1 = global_basis.x * _start_width - global_basis.x * _end_width -func _remove_point(i : int) -> void: - _points.remove_at(i) - _widths.remove_at(i) - _lifespans.remove_at(i) + _points.append(point_data) func _ready() -> void: - _old_pos = get_global_transform().origin + _previous_position = global_position mesh = ImmediateMesh.new() func _process(delta : float) -> void: - if(_old_pos - get_global_transform().origin).length() > _motion_delta and _trail_enabled: - _append_point() # Create new point - _old_pos = get_global_transform().origin # Update previous position to current position coordinates + if(_previous_position - global_position).length() > _motion_delta and _trail_enabled: + _append_point() + _previous_position = global_position - # Update the lifespan - var p : int = 0 - var max_points : int = _points.size() - while p < max_points: - _lifespans[p] += delta - if _lifespans[p] > _lifespan: - _remove_point(p) - p -= 1 - if (p < 0): p = 0 + _update_lifespans(delta) + _render_trail() - max_points = _points.size() - p += 1 +# Update all lifespans and use a mark-and-sweep algorithm to remove "expired" points +func _update_lifespans(delta : float) -> void: + var points_to_remove : Array = [] + for point_data : PointData in _points: + point_data.lifespan += delta + if point_data.lifespan > _lifespan: + points_to_remove.append(point_data) + for point_data : PointData in points_to_remove: + _points.erase(point_data) + +func _render_trail() -> void: mesh.clear_surfaces() - # If less than 2 points, stop rendering trail - if _points.size() < 2: + var number_of_points : int = _points.size() + if number_of_points < 2: return - # Render new mesh for each point + # Render new mesh for each point, triangle strips draw 2 triangles each 4 points + # which is perfect for a trail mesh.surface_begin(Mesh.PRIMITIVE_TRIANGLE_STRIP) - for i in range(_points.size()): - var t : float = float(i) / (_points.size() - 1.0) - var curr_color : Color = _start_color.lerp(_end_color, 1 - t) - mesh.surface_set_color(curr_color) + for point_index in range(number_of_points): + var point_data : PointData = _points[point_index] + var t : float = float(point_index) / (number_of_points - 1.0) + var current_color : Color = _start_color.lerp(_end_color, 1 - t) + mesh.surface_set_color(current_color) - var curr_width : Vector3 = _widths[i][0] - pow(1 - t, _scale_acceleration) * _widths[i][1] + var current_width : Vector3 = point_data.width_0 - pow(1 - t, _scaling_acceleration) * point_data.width_1 - var t0 : float = i / _points.size() + var t0 : float = float(point_index) / float(number_of_points) var t1 : float = t mesh.surface_set_uv(Vector2(t0, 0)) - mesh.surface_add_vertex(to_local(_points[i] + curr_width)) + mesh.surface_add_vertex(to_local(point_data.position + current_width)) mesh.surface_set_uv(Vector2(t1, 1)) - mesh.surface_add_vertex(to_local(_points[i] - curr_width)) + mesh.surface_add_vertex(to_local(point_data.position - current_width)) mesh.surface_end()