dust particles for hooves

2026-05-10 17:01:18 +03:00
parent c587b9877f
commit 4f1126563c
2 changed files with 104 additions and 7 deletions
@@ -3,16 +3,24 @@ extends CharacterBody3D
 const WALK_SPEED    = 6.0
 const CHARGE_SPEED  = 18.0
 const WALK_ACCEL    = 14.0
-const CHARGE_ACCEL  = 40.0   # snaps to charge speed quickly — burst feel
+const CHARGE_ACCEL  = 40.0
 const DECELERATION  = 12.0
-const CHARGE_DECEL  = 3.5    # momentum lingers after releasing shift
+const CHARGE_DECEL  = 3.5

-const WALK_TURN_FAST = 8.0   # rad/s at rest
-const WALK_TURN_SLOW = 3.5   # rad/s at full walk speed
-const CHARGE_TURN    = 0.55  # rad/s — ~31 deg/s, very wide committed arc
+const WALK_TURN_FAST = 8.0
+const WALK_TURN_SLOW = 3.5
+const CHARGE_TURN    = 0.55

 const JUMP_VELOCITY = 4.5

+# Hoof positions in bull_v10 local space — tweak y/z if hooves don't line up with the model
+const HOOF_OFFSETS: Array = [
+	Vector3(-0.30, -0.25, -0.50),
+	Vector3( 0.30, -0.25, -0.50),
+	Vector3(-0.30, -0.25,  0.60),
+	Vector3( 0.30, -0.25,  0.60),
+]
+
@export var visual_turn_speed: float = 12.0

@onready var camera_pivot: Node3D = $SpringArmPivot
@@ -21,6 +29,86 @@ const JUMP_VELOCITY = 4.5
 var current_speed: float = 0.0
 var facing_angle:  float = 0.0

+var _hoof_emitters: Array[CPUParticles3D] = []
+
+enum _DustState { NONE, WALK, CHARGE }
+var _dust_state: _DustState = _DustState.NONE
+
+
+func _ready() -> void:
+	_setup_hoof_dust()
+
+
+func _setup_hoof_dust() -> void:
+	var mat := StandardMaterial3D.new()
+	mat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
+	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
+	mat.vertex_color_use_as_albedo = true
+	mat.cull_mode = BaseMaterial3D.CULL_DISABLED
+
+	# 4×2 sphere = chunky low-poly diamond shape
+	var sphere := SphereMesh.new()
+	sphere.radius = 0.10
+	sphere.height = 0.20
+	sphere.radial_segments = 4
+	sphere.rings = 2
+	sphere.material = mat
+
+	# sand colour, fades to transparent over lifetime
+	var ramp := Gradient.new()
+	ramp.set_color(0, Color(0.80, 0.69, 0.46, 1.0))
+	ramp.set_color(1, Color(0.80, 0.69, 0.46, 0.0))
+
+	# puff blooms up then vanishes
+	var scale_curve := Curve.new()
+	scale_curve.add_point(Vector2(0.0, 0.2))
+	scale_curve.add_point(Vector2(0.4, 1.0))
+	scale_curve.add_point(Vector2(1.0, 0.0))
+
+	for offset: Vector3 in HOOF_OFFSETS:
+		var p := CPUParticles3D.new()
+		p.position = offset
+		p.emitting = false
+		p.amount = 12
+		p.lifetime = 0.9
+		p.explosiveness = 0.35
+		p.randomness = 0.6
+		p.local_coords = false
+		p.direction = Vector3(0.0, 1.0, 0.0)
+		p.spread = 45.0
+		p.gravity = Vector3(0.0, -1.5, 0.0)
+		p.initial_velocity_min = 0.8
+		p.initial_velocity_max = 1.8
+		p.scale_amount_min = 0.4
+		p.scale_amount_max = 0.7
+		p.mesh = sphere
+		p.color_ramp = ramp
+		p.scale_amount_curve = scale_curve
+		cube_guy.add_child(p)
+		_hoof_emitters.append(p)
+
+
+func _set_dust_state(new_state: _DustState) -> void:
+	if new_state == _dust_state:
+		return
+	_dust_state = new_state
+	for p: CPUParticles3D in _hoof_emitters:
+		match new_state:
+			_DustState.NONE:
+				p.emitting = false
+			_DustState.WALK:
+				p.scale_amount_min = 0.35
+				p.scale_amount_max = 0.65
+				p.initial_velocity_min = 0.8
+				p.initial_velocity_max = 1.8
+				p.emitting = true
+			_DustState.CHARGE:
+				p.scale_amount_min = 1.0
+				p.scale_amount_max = 2.2
+				p.initial_velocity_min = 2.8
+				p.initial_velocity_max = 5.5
+				p.emitting = true
+

 func _physics_process(delta: float) -> void:
 	if not is_on_floor():
@@ -35,11 +123,9 @@ func _physics_process(delta: float) -> void:
 	var flat_right   :=  Vector3(cam_basis.x.x, 0.0, cam_basis.x.z).normalized()
 	var direction    := (flat_forward * -input_dir.y + flat_right * input_dir.x).normalized()

-	# Logic for mimicking 4 legged animal movement
 	if direction:
 		var target_angle := atan2(direction.x, direction.z)

-		# Snap on first movement so there is no startup arc from 0
 		if current_speed < 0.01:
 			facing_angle = target_angle

@@ -64,3 +150,9 @@ func _physics_process(delta: float) -> void:
 	cube_guy.rotation.y = lerp_angle(cube_guy.rotation.y, facing_angle, delta * visual_turn_speed)

 	move_and_slide()
+
+	var charging := Input.is_key_pressed(KEY_SHIFT)
+	if current_speed > 0.5 and is_on_floor():
+		_set_dust_state(_DustState.CHARGE if charging else _DustState.WALK)
+	else:
+		_set_dust_state(_DustState.NONE)