extends MeshInstance3D

@export_group("Animation")
@export var life_time: float = 8.0
@export var fade_in_time: float = 4.0
@export var max_base_alpha: float = 1.0

func _ready():
	var mat = get_active_material(0).duplicate()
	set_surface_override_material(0, mat)
	
	#add_to_group("camere")
	
	#set alpha to 0 before first frame to avoid "pop"
	mat.set_shader_parameter("base_alpha", 0.0)
	
	animate_godray(mat)

func animate_godray(mat: ShaderMaterial):
	var tween_alpha = create_tween()
	tween_alpha.tween_property(mat, "shader_parameter/base_alpha", max_base_alpha, fade_in_time).from(0.0)

	var tween_intensity = create_tween()
	#tween from 1.0 to 2.0
	tween_intensity.tween_property(mat, "shader_parameter/intensity_multiplier", 0.2, life_time * 0.3).from(1.0)
	#tween to 0.5
	tween_intensity.tween_property(mat, "shader_parameter/intensity_multiplier", 0.5, life_time * 0.3)
	#tween to 0.0
	tween_intensity.tween_property(mat, "shader_parameter/intensity_multiplier", 0.0, life_time * 0.4)
	
	tween_intensity.tween_callback(queue_free)

	var tween_edge = create_tween()
	tween_edge.tween_property(mat, "shader_parameter/edge_fade_power", 0.5, life_time * 0.5).from(2.0)
	tween_edge.tween_property(mat, "shader_parameter/edge_fade_power", 2.0, life_time * 0.5)