Add emission line gizmo

gizmo/gizmo.gd

@@ -0,0 +1,27 @@
+@tool
+extends EditorNode3DGizmoPlugin
+
+var editor_plugin : EditorPlugin
+
+func _init(_editor_plugin:EditorPlugin):
+	editor_plugin = _editor_plugin
+	create_material("main", Color(1,1,1), false, true, true)
+
+func _has_gizmo(node):
+	return node is GPUTrail3D
+
+# show gizmo name in visibility list
+func _get_gizmo_name():
+	return "GPUTrail3DGizmo"
+
+func _redraw(gizmo):
+	gizmo.clear()
+
+	var node3d : Node3D = gizmo.get_node_3d()
+
+	var lines = PackedVector3Array()
+
+	lines.push_back(Vector3(0,1,0))
+	lines.push_back(Vector3(0,-1,0))
+
+	gizmo.add_lines(lines, get_material("main", gizmo), false, Color(1,1,1,1))

plugin.gd

@@ -1,12 +1,19 @@
 @tool
 extends EditorPlugin
 
+const MyCustomGizmoPlugin = preload("gizmo/gizmo.gd")
+var gizmo_plugin = MyCustomGizmoPlugin.new(self)
+
 func _enter_tree():
 	# Initialization of the plugin goes here.
 	# Add the new type with a name, a parent type, a script and an icon.
 	add_custom_type("GPUTrail3D", "GPUParticles3D", preload("GPUTrail3D.gd"), preload("bounce.svg"))
+
+	add_node_3d_gizmo_plugin(gizmo_plugin)
 
 func _exit_tree():
 	# Clean-up of the plugin goes here.
 	# Always remember to remove it from the engine when deactivated.
 	remove_custom_type("GPUTrail3D")
+
+	remove_node_3d_gizmo_plugin(gizmo_plugin)