Add editor freelook navigation scheme settings

Depending on what one is trying to achieve, a different freelook mode
may be more desirable.

This closes #34034.

editor/editor_settings.cpp

@@ -559,6 +559,8 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 	hints["editors/3d/navigation_feel/manipulation_translation_inertia"] = PropertyInfo(Variant::FLOAT, "editors/3d/navigation_feel/manipulation_translation_inertia", PROPERTY_HINT_RANGE, "0.0, 1, 0.01");
 
 	// 3D: Freelook
+	_initial_set("editors/3d/freelook/freelook_navigation_scheme", false);
+	hints["editors/3d/freelook/freelook_navigation_scheme"] = PropertyInfo(Variant::INT, "editors/3d/freelook/freelook_navigation_scheme", PROPERTY_HINT_ENUM, "Default,Partially Axis-Locked (id Tech),Fully Axis-Locked (Minecraft)");
 	_initial_set("editors/3d/freelook/freelook_inertia", 0.1);
 	hints["editors/3d/freelook/freelook_inertia"] = PropertyInfo(Variant::FLOAT, "editors/3d/freelook/freelook_inertia", PROPERTY_HINT_RANGE, "0.0, 1, 0.01");
 	_initial_set("editors/3d/freelook/freelook_base_speed", 5.0);

editor/plugins/node_3d_editor_plugin.cpp

@@ -2287,9 +2287,27 @@ void Node3DEditorViewport::_update_freelook(real_t delta) {
 		return;
 	}
 
-	const Vector3 forward = camera->get_transform().basis.xform(Vector3(0, 0, -1));
+	const FreelookNavigationScheme navigation_scheme = (FreelookNavigationScheme)EditorSettings::get_singleton()->get("editors/3d/freelook/freelook_navigation_scheme").operator int();
+
+	Vector3 forward;
+	if (navigation_scheme == FREELOOK_FULLY_AXIS_LOCKED) {
+		// Forward/backward keys will always go straight forward/backward, never moving on the Y axis.
+		forward = Vector3(0, 0, -1).rotated(Vector3(0, 1, 0), camera->get_rotation().y);
+	} else {
+		// Forward/backward keys will be relative to the camera pitch.
+		forward = camera->get_transform().basis.xform(Vector3(0, 0, -1));
+	}
+
 	const Vector3 right = camera->get_transform().basis.xform(Vector3(1, 0, 0));
-	const Vector3 up = camera->get_transform().basis.xform(Vector3(0, 1, 0));
+
+	Vector3 up;
+	if (navigation_scheme == FREELOOK_PARTIALLY_AXIS_LOCKED || navigation_scheme == FREELOOK_FULLY_AXIS_LOCKED) {
+		// Up/down keys will always go up/down regardless of camera pitch.
+		up = Vector3(0, 1, 0);
+	} else {
+		// Up/down keys will be relative to the camera pitch.
+		up = camera->get_transform().basis.xform(Vector3(0, 1, 0));
+	}
 
 	Vector3 direction;
 

editor/plugins/node_3d_editor_plugin.h

@@ -241,6 +241,12 @@ public:
 		NAVIGATION_MODO,
 	};
 
+	enum FreelookNavigationScheme {
+		FREELOOK_DEFAULT,
+		FREELOOK_PARTIALLY_AXIS_LOCKED,
+		FREELOOK_FULLY_AXIS_LOCKED,
+	};
+
 private:
 	float cpu_time_history[FRAME_TIME_HISTORY];
 	int cpu_time_history_index;