extends Particles

export var rows = 64.0 setget set_rows, get_rows
func set_rows( value ):
    rows = value
    amount = rows * rows
    update_aabb()
    if process_material:
        process_material.set_shader_param( "rows", rows )
func get_rows():
    return rows
    

export var spacing = 1.0 setget set_spacing, get_spacing
func set_spacing( value ):
    spacing = value
    update_aabb()
    if process_material:
        process_material.set_shader_param( "spacing", spacing )
func get_spacing():
    return spacing
    

func update_aabb():
    var size = self.rows * self.spacing
    self.visibility_aabb = AABB( -Vector3(0.5*size, 50.0, 0.5*size), Vector3(size, 100.0, size) )

func _ready():
    self.set_rows( self.rows )
    self.set_spacing( self.spacing )

func _process( delta ):

    var viewport = self.get_viewport()
    var camera = viewport.get_camera()
    if camera:
        var pos = camera.global_transform.origin
        pos.y = 0.0
        self.global_transform.origin = pos