From 765da0a365b63cef3e3459467e14e5206d7164e4 Mon Sep 17 00:00:00 2001
From: Markus Sauermann <6299227+Sauermann@users.noreply.github.com>
Date: Tue, 22 Aug 2023 08:22:38 +0200
Subject: [PATCH] Document mouse-picking limit of 64 objects

---
 doc/classes/Viewport.xml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/doc/classes/Viewport.xml b/doc/classes/Viewport.xml
index 101717966ec..43640916f44 100644
--- a/doc/classes/Viewport.xml
+++ b/doc/classes/Viewport.xml
@@ -298,10 +298,12 @@
 		</member>
 		<member name="physics_object_picking" type="bool" setter="set_physics_object_picking" getter="get_physics_object_picking" default="false">
 			If [code]true[/code], the objects rendered by viewport become subjects of mouse picking process.
+			[b]Note:[/b] The number of simultaneously pickable objects is limited to 64 and they are selected in a non-deterministic order, which can be different in each picking process.
 		</member>
 		<member name="physics_object_picking_sort" type="bool" setter="set_physics_object_picking_sort" getter="get_physics_object_picking_sort" default="false">
 			If [code]true[/code], objects receive mouse picking events sorted primarily by their [member CanvasItem.z_index] and secondarily by their position in the scene tree. If [code]false[/code], the order is undetermined.
 			[b]Note:[/b] This setting is disabled by default because of its potential expensive computational cost.
+			[b]Note:[/b] Sorting happens after selecting the pickable objects. Because of the limitation of 64 simultaneously pickable objects, it is not guaranteed that the object with the highest [member CanvasItem.z_index] receives the picking event.
 		</member>
 		<member name="positional_shadow_atlas_16_bits" type="bool" setter="set_positional_shadow_atlas_16_bits" getter="get_positional_shadow_atlas_16_bits" default="true">
 			Use 16 bits for the omni/spot shadow depth map. Enabling this results in shadows having less precision and may result in shadow acne, but can lead to performance improvements on some devices.