138 lines
5.1 KiB
GDScript
138 lines
5.1 KiB
GDScript
extends MultiMeshInstance3D
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## A whole stand of cheering spectators rendered as camera-facing billboards in a
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## single draw call — the performant replacement for dozens of skinned crowd skeletons.
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## The sprite sheet is baked from the existing crowd figure by tools/bake_crowd_sheet.gd.
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##
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## Placement mirrors an existing crowd node (default: the sibling PublikNode) so the
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## billboards land exactly where the crowd was authored; if that node is missing it
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## falls back to a generated tribune so the scene still populates.
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const SHEET_PATH := "res://Assets/crowd_clap_sheet.png"
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const SHADER_PATH := "res://crowd_billboard.gdshader"
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## Node whose descendant figures (names starting with `figure_prefix`) donate their
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## world positions. Empty = use the generated fallback stand.
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@export var source_path: NodePath = ^"../PublikNode"
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@export var figure_prefix: String = "mees"
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## World height of a spectator billboard, in metres. Sheet aspect sets the width.
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@export var figure_height: float = 2.0
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@export var frames: int = 8
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@export var clap_fps: float = 10.0
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## Subtle per-spectator brightness spread so the crowd doesn't read as clones.
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@export_range(0.0, 0.5) var tint_variation: float = 0.18
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# Fallback tribune (used only when source_path resolves to nothing) — concentric arcs
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# of seats ringing the arena.
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@export_group("Fallback stand")
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@export var fallback_count: int = 120
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@export var fallback_inner_radius: float = 26.0
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@export var fallback_rows: int = 6
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@export var fallback_row_rise: float = 1.6
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@export var fallback_row_step: float = 2.2
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@export var fallback_seat_step: float = 2.4
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var _rng := RandomNumberGenerator.new()
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func _ready() -> void:
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_rng.seed = hash("bullosseum-crowd") # deterministic layout/phases across runs
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_build()
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func _build() -> void:
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var sheet := load(SHEET_PATH) as Texture2D
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if sheet == null:
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push_warning("crowd_billboards: missing sheet %s — run tools/bake_crowd_sheet.gd" % SHEET_PATH)
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return
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# Sheet holds `frames` columns and 2 rows (front / back), so a cell is half-height.
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var aspect := (float(sheet.get_width()) / float(frames)) / (float(sheet.get_height()) / 2.0)
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var quad := QuadMesh.new()
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quad.size = Vector2(figure_height * aspect, figure_height)
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quad.center_offset = Vector3(0.0, figure_height * 0.5, 0.0) # pivot at the feet
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var mat := ShaderMaterial.new()
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mat.shader = load(SHADER_PATH) as Shader
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mat.set_shader_parameter("sheet", sheet)
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mat.set_shader_parameter("hframes", frames)
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mat.set_shader_parameter("fps", clap_fps)
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material_override = mat
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var seats := _seat_positions()
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var center := _arena_center(seats)
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var mm := MultiMesh.new()
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mm.transform_format = MultiMesh.TRANSFORM_3D
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mm.use_custom_data = true
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mm.mesh = quad
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mm.instance_count = seats.size()
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for i in seats.size():
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var s := 1.0 + _rng.randf_range(-0.06, 0.06) # slight height variety
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mm.set_instance_transform(i, Transform3D(_facing_basis(seats[i], center, s), seats[i]))
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var b := 1.0 + _rng.randf_range(-tint_variation, tint_variation)
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mm.set_instance_custom_data(i, Color(_rng.randf(), b, b * 0.99, b * 0.98))
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multimesh = mm
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# Orientation for a seat: the sprite's forward (+Z, the quad's face) points horizontally
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# inward at the arena centre, so each ring segment faces the action instead of the
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# camera. Upright (world +Y), uniformly scaled by `s`.
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func _facing_basis(seat: Vector3, center: Vector3, s: float) -> Basis:
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var look := center - seat
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look.y = 0.0
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look = look.normalized() if look.length() > 0.001 else Vector3(0.0, 0.0, -1.0)
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var up := Vector3.UP
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var right := up.cross(look).normalized()
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var basis := Basis()
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basis.x = right
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basis.y = up
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basis.z = look
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return basis.scaled(Vector3.ONE * s)
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# Horizontal centre the crowd faces — the mean of the seat positions (the ring/stand
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# centroid), which for an arena crowd is the middle of the pitch.
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func _arena_center(seats: PackedVector3Array) -> Vector3:
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if seats.is_empty():
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return global_position
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var sum := Vector3.ZERO
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for p in seats:
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sum += p
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return sum / float(seats.size())
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# Global feet-positions for every spectator: harvested from the source crowd if present,
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# otherwise the generated fallback tribune.
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func _seat_positions() -> PackedVector3Array:
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var out := PackedVector3Array()
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var src := get_node_or_null(source_path)
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if src != null:
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_collect_figures(src, out)
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if out.is_empty():
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_fallback_stand(out)
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return out
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func _collect_figures(node: Node, out: PackedVector3Array) -> void:
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if node is Node3D and node != self and (node as Node3D).name.begins_with(figure_prefix):
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out.append((node as Node3D).global_position)
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return # don't descend into a figure's own rig
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for c in node.get_children():
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_collect_figures(c, out)
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func _fallback_stand(out: PackedVector3Array) -> void:
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var placed := 0
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for row in fallback_rows:
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var radius := fallback_inner_radius + float(row) * fallback_row_step
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var y := float(row) * fallback_row_rise
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var circumference := TAU * radius
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var seats_in_row := int(circumference / fallback_seat_step)
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for s in seats_in_row:
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if placed >= fallback_count:
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return
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var ang := TAU * float(s) / float(seats_in_row)
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out.append(Vector3(cos(ang) * radius, y, sin(ang) * radius))
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placed += 1
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