debug_eye_uv.gd

## Debug: dump the UV cells used by the eye mesh and the palette colors there.
extends SceneTree

func _init() -> void:
	var scene: PackedScene = load("res://synty_assets/meshes/Species/Humans/SK_HUMN_BASE_01_05EYEL_HU01.fbx")
	var instance := scene.instantiate()
	var meshes: Array[MeshInstance3D] = []
	_collect(instance, meshes)
	var image := (load("res://synty_assets/textures/T_ColorMap.png") as Texture2D).get_image()

	for mesh_instance in meshes:
		var mesh := mesh_instance.mesh
		for surface in mesh.get_surface_count():
			var arrays := mesh.surface_get_arrays(surface)
			var uvs: PackedVector2Array = arrays[Mesh.ARRAY_TEX_UV]
			var min_uv := Vector2(INF, INF)
			var max_uv := Vector2(-INF, -INF)
			var cells := {}
			for uv in uvs:
				min_uv = min_uv.min(uv)
				max_uv = max_uv.max(uv)
				var cu := clampi(int(floor(uv.x * 16.0)), 0, 15)
				var cv := clampi(int(floor(uv.y * 16.0)), 0, 15)
				cells[Vector2i(cu, cv)] = cells.get(Vector2i(cu, cv), 0) + 1
			print("%s surface %d: %d verts, uv min=%s max=%s" % [mesh_instance.name, surface, uvs.size(), min_uv, max_uv])
			for cell: Vector2i in cells:
				# Godot images are top-left origin; UV.y=0 is the TOP of the image in Godot.
				var px := cell.x * 2
				var py := cell.y * 2
				var color := image.get_pixel(px, py)
				print("  godot-uv cell (%d,%d) -> pixel(%d,%d) color=%s  verts=%d" % [cell.x, cell.y, px, py, color.to_html(false), cells[cell]])
	instance.free()
	quit(0)


func _collect(node: Node, result: Array[MeshInstance3D]) -> void:
	if node is MeshInstance3D and (node as MeshInstance3D).mesh != null:
		result.append(node)
	for child in node.get_children():
		_collect(child, result)