## Import From SimpleGrassTextured
# 
# This script demonstrates how to import transforms from SimpleGrassTextured. To use it:
#
# 1. Setup the mesh asset you wish to use in the asset dock.
# 1. Select your Terrain3D node.
# 1. In the inspector, click Script (very bottom) and Quick Load import_sgt.gd.
# 1. At the very top, assign your SimpleGrassTextured node.
# 1. Input the desired mesh asset ID.
# 1. Click import. The output window and console will report when finished.
# 1. Clear the script from your Terrain3D node, and save your scene. 
#
# The instance transforms are now stored in your region files.
#
# Use clear_instances to erase all instances that match the assign_mesh_id.
#
# The add_transforms function (called by add_multimesh) applies the height_offset specified in the 
# Terrain3DMeshAsset. 
# Once the transforms are imported, you can reassign any mesh you like into this mesh slot.

@tool
extends Terrain3D

@export var simple_grass_textured: MultiMeshInstance3D
@export var assign_mesh_id: int
@export var import: bool = false : set = import_sgt
@export var clear_instances: bool = false : set = clear_multimeshes


func clear_multimeshes(value: bool) -> void:
	get_instancer().clear_by_mesh(assign_mesh_id)


func import_sgt(value: bool) -> void:
	var sgt_mm: MultiMesh = simple_grass_textured.multimesh
	var global_xform: Transform3D = simple_grass_textured.global_transform	
	print("Starting to import %d instances from SimpleGrassTextured using mesh id %d" % [ sgt_mm.instance_count, assign_mesh_id])
	var time: int = Time.get_ticks_msec()
	get_instancer().add_multimesh(assign_mesh_id, sgt_mm, simple_grass_textured.global_transform)	
	print("Import complete in %.2f seconds" % [ float(Time.get_ticks_msec() - time)/1000. ])