From b8f66d58b6d03274788e31cd67f22b9d15c8632c Mon Sep 17 00:00:00 2001
From: Aaron Franke <arnfranke@yahoo.com>
Date: Fri, 9 Apr 2021 08:52:10 -0400
Subject: [PATCH] Show a message when trying to zoom farther than the limit

---
 editor/plugins/node_3d_editor_plugin.cpp | 17 +++++++++++++++++
 editor/plugins/node_3d_editor_plugin.h   |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/editor/plugins/node_3d_editor_plugin.cpp b/editor/plugins/node_3d_editor_plugin.cpp
index 0db57b1d9d7..25fb637fb8c 100644
--- a/editor/plugins/node_3d_editor_plugin.cpp
+++ b/editor/plugins/node_3d_editor_plugin.cpp
@@ -2215,6 +2215,12 @@ void Node3DEditorViewport::scale_cursor_distance(real_t scale) {
 		cursor.distance = CLAMP(cursor.distance * scale, min_distance, max_distance);
 	}
 
+	if (cursor.distance == max_distance || cursor.distance == min_distance) {
+		zoom_failed_attempts_count++;
+	} else {
+		zoom_failed_attempts_count = 0;
+	}
+
 	zoom_indicator_delay = ZOOM_FREELOOK_INDICATOR_DELAY_S;
 	surface->update();
 }
@@ -2396,6 +2402,7 @@ void Node3DEditorViewport::_notification(int p_what) {
 			zoom_indicator_delay -= delta;
 			if (zoom_indicator_delay <= 0) {
 				surface->update();
+				zoom_limit_label->hide();
 			}
 		}
 
@@ -2775,6 +2782,7 @@ void Node3DEditorViewport::_draw() {
 
 			} else {
 				// Show zoom
+				zoom_limit_label->set_visible(zoom_failed_attempts_count > 15);
 
 				real_t min_distance = MAX(camera->get_near() * 4, ZOOM_FREELOOK_MIN);
 				real_t max_distance = MIN(camera->get_far() / 4, ZOOM_FREELOOK_MAX);
@@ -4137,6 +4145,15 @@ Node3DEditorViewport::Node3DEditorViewport(Node3DEditor *p_spatial_editor, Edito
 	locked_label->set_text(TTR("View Rotation Locked"));
 	locked_label->hide();
 
+	zoom_limit_label = memnew(Label);
+	zoom_limit_label->set_anchors_and_offsets_preset(LayoutPreset::PRESET_BOTTOM_LEFT);
+	zoom_limit_label->set_offset(Side::SIDE_TOP, -28 * EDSCALE);
+	zoom_limit_label->set_text(TTR("To zoom further, change the camera's clipping planes (View -> Settings...)"));
+	zoom_limit_label->set_name("ZoomLimitMessageLabel");
+	zoom_limit_label->add_theme_color_override("font_color", Color(1, 1, 1, 1));
+	zoom_limit_label->hide();
+	surface->add_child(zoom_limit_label);
+
 	frame_time_gradient = memnew(Gradient);
 	// The color is set when the theme changes.
 	frame_time_gradient->add_point(0.5, Color());
diff --git a/editor/plugins/node_3d_editor_plugin.h b/editor/plugins/node_3d_editor_plugin.h
index ff4a941b06c..70329f90c7d 100644
--- a/editor/plugins/node_3d_editor_plugin.h
+++ b/editor/plugins/node_3d_editor_plugin.h
@@ -295,6 +295,7 @@ private:
 	Label *info_label;
 	Label *cinema_label;
 	Label *locked_label;
+	Label *zoom_limit_label;
 
 	VBoxContainer *top_right_vbox;
 	ViewportRotationControl *rotation_control;
@@ -418,6 +419,7 @@ private:
 	void scale_freelook_speed(real_t scale);
 
 	real_t zoom_indicator_delay;
+	int zoom_failed_attempts_count = 0;
 
 	RID move_gizmo_instance[3], move_plane_gizmo_instance[3], rotate_gizmo_instance[4], scale_gizmo_instance[3], scale_plane_gizmo_instance[3];