Added footsteps, new tree, various other tweaks

addons/proton_scatter/src/shapes/sphere_shape.gd

@@ -0,0 +1,71 @@
+@tool
+class_name ProtonScatterSphereShape
+extends ProtonScatterBaseShape
+
+
+@export var radius := 1.0:
+	set(val):
+		radius = val
+		_radius_squared = val * val
+		emit_changed()
+
+var _radius_squared := 0.0
+
+
+func get_copy():
+	var copy = ProtonScatterSphereShape.new()
+	copy.radius = radius
+	return copy
+
+
+func is_point_inside(point: Vector3, global_transform: Transform3D) -> bool:
+	var shape_center = global_transform * Vector3.ZERO
+	return shape_center.distance_squared_to(point) < _radius_squared
+
+
+func get_corners_global(gt: Transform3D) -> Array:
+	var res := []
+
+	var corners := [
+		Vector3(-1, -1, -1),
+		Vector3(-1, -1, 1),
+		Vector3(1, -1, 1),
+		Vector3(1, -1, -1),
+		Vector3(-1, 1, -1),
+		Vector3(-1, 1, 1),
+		Vector3(1, 1, 1),
+		Vector3(1, 1, -1),
+	]
+
+	for c in corners:
+		c *= radius
+		res.push_back(gt * c)
+
+	return res
+
+
+
+# Returns the circle matching the intersection between the scatter node XZ plane
+# and the sphere. Returns an empty array if there's no intersection.
+func get_closed_edges(shape_t: Transform3D) -> Array[PackedVector2Array]:
+	var edge := PackedVector2Array()
+	var plane := Plane(Vector3.UP, 0.0)
+
+	var sphere_center := shape_t.origin
+	var dist2plane = plane.distance_to(sphere_center)
+	var radius_at_ground_level := sqrt(pow(radius, 2) - pow(dist2plane, 2))
+
+	# No intersection with plane
+	if radius_at_ground_level <= 0.0 or radius_at_ground_level > radius:
+		return []
+
+	var origin := Vector2(sphere_center.x, sphere_center.z)
+	var steps: int = max(16, int(radius_at_ground_level * 12))
+	var angle: float = TAU / steps
+
+	for i in steps + 1:
+		var theta = angle * i
+		var point := origin + Vector2(cos(theta), sin(theta)) * radius_at_ground_level
+		edge.push_back(point)
+
+	return [edge]