chore: modifiers are aware of parent terrain

modules/terrain/terrain.cpp

@@ -9,16 +9,27 @@ void Terrain::_bind_methods() {
 	BIND_PROPERTY(Variant::INT, thread_count);
 }
 
-void Terrain::ready() {
+void Terrain::child_order_changed() {
-	construct_chunk_grid();
+	this->modifiers.clear();
+	for (Variant var : get_children()) {
+		if (TerrainModifier * mod{ cast_to<TerrainModifier>(var) }) {
+			mod->set_terrain(this);
+			this->modifiers.push_back(mod);
+		}
+	}
 }
 
 void Terrain::_notification(int what) {
 	switch (what) {
 		default:
 			return;
+		case NOTIFICATION_ENTER_TREE:
+			if (!is_ready()) {
+				connect("child_order_changed", callable_mp(this, &self_type::child_order_changed));
+			}
+			return;
 		case NOTIFICATION_READY:
-			ready();
+			construct_chunk_grid();
 			return;
 		case NOTIFICATION_EXIT_TREE:
 			this->workload_lock.lock();

modules/terrain/terrain.h

@@ -3,16 +3,14 @@
 #include "core/os/mutex.h"
 #include "core/os/thread.h"
 #include "core/templates/vector.h"
-#include "macros.h"
 #include "scene/main/node.h"
-#include "scene/main/timer.h"
 class TerrainChunkMesh;
 class TerrainModifier;
 
 class Terrain : public Node {
 	GDCLASS(Terrain, Node);
 	static void _bind_methods();
-	void ready();
+	void child_order_changed();
 
 protected:
 	void _notification(int what);

modules/terrain/terrain_modifier.h

@@ -5,6 +5,7 @@
 #include "macros.h"
 #include "scene/3d/marker_3d.h"
 #include "scene/resources/curve.h"
+class Terrain;
 
 class TerrainModifier : public Marker3D {
 	GDCLASS(TerrainModifier, Marker3D);
@@ -27,6 +28,7 @@ private:
 	BlendMode blend_mode{ Add };
 	Vector3 thread_safe_global_position{};
 	bool dirty{ false };
+	Terrain *terrain{ nullptr };
 
 public:
 	Vector3 get_thread_safe_global_position() const;
@@ -35,6 +37,7 @@ public:
 	void set_blend_mode(BlendMode mode);
 	BlendMode get_blend_mode() const;
 	GET_SET_FNS(bool, dirty);
+	GET_SET_FNS(Terrain *, terrain);
 
 	static String const sig_changed;
 };