new terrain plugin

addons/terrain_3d/src/region_gizmo.gd

@@ -0,0 +1,68 @@
+# Copyright © 2025 Cory Petkovsek, Roope Palmroos, and Contributors.
+# Editor Region Gizmos for Terrain3D
+extends EditorNode3DGizmo
+	
+var material: StandardMaterial3D
+var selection_material: StandardMaterial3D
+var region_position: Vector2
+var region_size: float
+var grid: Array[Vector2i]
+var use_secondary_color: bool = false
+var show_rect: bool = true
+
+var main_color: Color = Color.GREEN_YELLOW
+var secondary_color: Color = Color.RED
+var grid_color: Color = Color.WHITE
+var border_color: Color = Color.BLUE
+
+
+func _init() -> void:
+	material = StandardMaterial3D.new()
+	material.set_flag(BaseMaterial3D.FLAG_DISABLE_DEPTH_TEST, true)
+	material.set_flag(BaseMaterial3D.FLAG_ALBEDO_FROM_VERTEX_COLOR, true)
+	material.set_shading_mode(BaseMaterial3D.SHADING_MODE_UNSHADED)
+	material.set_albedo(Color.WHITE)
+	
+	selection_material = material.duplicate()
+	selection_material.set_render_priority(0)
+
+
+func _redraw() -> void:
+	clear()
+	
+	var rect_position = region_position * region_size
+
+	if show_rect:
+		var modulate: Color = main_color if !use_secondary_color else secondary_color
+		if abs(region_position.x) > Terrain3DData.REGION_MAP_SIZE*.5 or abs(region_position.y) > Terrain3DData.REGION_MAP_SIZE*.5:
+			modulate = Color.GRAY
+		draw_rect(Vector2(region_size,region_size)*.5 + rect_position, region_size, selection_material, modulate)
+	
+	for pos in grid:
+		var grid_tile_position = Vector2(pos) * region_size
+		if show_rect and grid_tile_position == rect_position:
+			# Skip this one, otherwise focused region borders are not always visible due to draw order
+			continue
+			
+		draw_rect(Vector2(region_size,region_size)*.5 + grid_tile_position, region_size, material, grid_color)
+		
+	draw_rect(Vector2.ZERO, region_size * Terrain3DData.REGION_MAP_SIZE, material, border_color)
+
+
+func draw_rect(p_pos: Vector2, p_size: float, p_material: StandardMaterial3D, p_modulate: Color) -> void:
+	var lines: PackedVector3Array = [
+		Vector3(-1, 0, -1),
+		Vector3(-1, 0, 1),
+		Vector3(1, 0, 1),
+		Vector3(1, 0, -1),
+		Vector3(-1, 0, 1),
+		Vector3(1, 0, 1),
+		Vector3(1, 0, -1),
+		Vector3(-1, 0, -1),
+	]
+	
+	for i in lines.size():
+		lines[i] = ((lines[i] / 2.0) * p_size) + Vector3(p_pos.x, 0, p_pos.y)
+	
+	add_lines(lines, p_material, false, p_modulate)
+