7 files changed, 15 insertions, 12 deletions
diff --git a/scene/3d/audio_stream_player_3d.cpp b/scene/3d/audio_stream_player_3d.cpp
index 27f16f7601..05ae281cc1 100644
--- a/scene/3d/audio_stream_player_3d.cpp
+++ b/scene/3d/audio_stream_player_3d.cpp
@@ -836,6 +836,7 @@ void AudioStreamPlayer3D::set_emission_angle(float p_angle) {
 	ERR_FAIL_COND(p_angle < 0 || p_angle > 90);
 	emission_angle = p_angle;
 	update_gizmo();
+	_change_notify("emission_angle");
 }
 
 float AudioStreamPlayer3D::get_emission_angle() const {
diff --git a/scene/3d/baked_lightmap.cpp b/scene/3d/baked_lightmap.cpp
index c5ff4dadbc..4b1eccb40d 100644
--- a/scene/3d/baked_lightmap.cpp
+++ b/scene/3d/baked_lightmap.cpp
@@ -88,7 +88,7 @@ float BakedLightmapData::get_energy() const {
 
 void BakedLightmapData::add_user(const NodePath &p_path, const Ref<Texture> &p_lightmap, int p_instance) {
 
-	ERR_FAIL_COND(p_lightmap.is_null());
+	ERR_FAIL_COND_MSG(p_lightmap.is_null(), "It's not a reference to a valid Texture object.");
 	User user;
 	user.path = p_path;
 	user.lightmap = p_lightmap;
@@ -215,6 +215,7 @@ float BakedLightmap::get_capture_cell_size() const {
 void BakedLightmap::set_extents(const Vector3 &p_extents) {
 	extents = p_extents;
 	update_gizmo();
+	_change_notify("bake_extents");
 }
 
 Vector3 BakedLightmap::get_extents() const {
@@ -359,7 +360,7 @@ BakedLightmap::BakeError BakedLightmap::bake(Node *p_from_node, bool p_create_vi
 		//check for valid save path
 		DirAccessRef d = DirAccess::open(save_path);
 		if (!d) {
-			ERR_PRINTS("Invalid Save Path: " + save_path);
+			ERR_PRINTS("Invalid Save Path '" + save_path + "'.");
 			return BAKE_ERROR_NO_SAVE_PATH;
 		}
 	}
diff --git a/scene/3d/cpu_particles.cpp b/scene/3d/cpu_particles.cpp
index fc16bc36cb..93ff60bc4e 100644
--- a/scene/3d/cpu_particles.cpp
+++ b/scene/3d/cpu_particles.cpp
@@ -53,7 +53,7 @@ void CPUParticles::set_emitting(bool p_emitting) {
 
 void CPUParticles::set_amount(int p_amount) {
 
-	ERR_FAIL_COND(p_amount < 1);
+	ERR_FAIL_COND_MSG(p_amount < 1, "Amount of particles must be greater than 0.");
 
 	particles.resize(p_amount);
 	{
@@ -71,7 +71,7 @@ void CPUParticles::set_amount(int p_amount) {
 }
 void CPUParticles::set_lifetime(float p_lifetime) {
 
-	ERR_FAIL_COND(p_lifetime <= 0);
+	ERR_FAIL_COND_MSG(p_lifetime <= 0, "Particles lifetime must be greater than 0.");
 	lifetime = p_lifetime;
 }
 
@@ -915,8 +915,8 @@ void CPUParticles::_particles_process(float p_delta) {
 		}
 
 		//scale by scale
-		float base_scale = Math::lerp(parameters[PARAM_SCALE] * tex_scale, 1.0f, p.scale_rand * randomness[PARAM_SCALE]);
-		if (base_scale == 0.0) base_scale = 0.000001;
+		float base_scale = tex_scale * Math::lerp(parameters[PARAM_SCALE], 1.0f, p.scale_rand * randomness[PARAM_SCALE]);
+		if (base_scale < 0.000001) base_scale = 0.000001;
 
 		p.transform.basis.scale(Vector3(1, 1, 1) * base_scale);
 
@@ -1193,7 +1193,7 @@ void CPUParticles::_notification(int p_what) {
 void CPUParticles::convert_from_particles(Node *p_particles) {
 
 	Particles *particles = Object::cast_to<Particles>(p_particles);
-	ERR_FAIL_COND(!particles);
+	ERR_FAIL_COND_MSG(!particles, "Only Particles nodes can be converted to CPUParticles.");
 
 	set_emitting(particles->is_emitting());
 	set_amount(particles->get_amount());
diff --git a/scene/3d/gi_probe.cpp b/scene/3d/gi_probe.cpp
index a04f156d80..ccc87b924c 100644
--- a/scene/3d/gi_probe.cpp
+++ b/scene/3d/gi_probe.cpp
@@ -243,6 +243,7 @@ void GIProbe::set_extents(const Vector3 &p_extents) {
 
 	extents = p_extents;
 	update_gizmo();
+	_change_notify("extents");
 }
 
 Vector3 GIProbe::get_extents() const {
diff --git a/scene/3d/navigation.cpp b/scene/3d/navigation.cpp
index 12d562c0c6..ba0460d47c 100644
--- a/scene/3d/navigation.cpp
+++ b/scene/3d/navigation.cpp
@@ -230,7 +230,7 @@ void Navigation::navmesh_set_transform(int p_id, const Transform &p_xform) {
 }
 void Navigation::navmesh_remove(int p_id) {
 
-	ERR_FAIL_COND(!navmesh_map.has(p_id));
+	ERR_FAIL_COND_MSG(!navmesh_map.has(p_id), "Trying to remove nonexisting navmesh with id: " + itos(p_id));
 	_navmesh_unlink(p_id);
 	navmesh_map.erase(p_id);
 }
diff --git a/scene/3d/particles.cpp b/scene/3d/particles.cpp
index a6ccdb5791..241eb7d1ca 100644
--- a/scene/3d/particles.cpp
+++ b/scene/3d/particles.cpp
@@ -57,13 +57,13 @@ void Particles::set_emitting(bool p_emitting) {
 
 void Particles::set_amount(int p_amount) {
 
-	ERR_FAIL_COND(p_amount < 1);
+	ERR_FAIL_COND_MSG(p_amount < 1, "Amount of particles cannot be smaller than 1.");
 	amount = p_amount;
 	VS::get_singleton()->particles_set_amount(particles, amount);
 }
 void Particles::set_lifetime(float p_lifetime) {
 
-	ERR_FAIL_COND(p_lifetime <= 0);
+	ERR_FAIL_COND_MSG(p_lifetime <= 0, "Particles lifetime must be greater than 0.");
 	lifetime = p_lifetime;
 	VS::get_singleton()->particles_set_lifetime(particles, lifetime);
 }
diff --git a/scene/3d/physics_body.cpp b/scene/3d/physics_body.cpp
index 71040d2d68..a02cc4bee6 100644
--- a/scene/3d/physics_body.cpp
+++ b/scene/3d/physics_body.cpp
@@ -188,7 +188,7 @@ void StaticBody::set_friction(real_t p_friction) {
 
 	WARN_DEPRECATED_MSG("The method set_friction has been deprecated and will be removed in the future, use physics material instead.");
 
-	ERR_FAIL_COND(p_friction < 0 || p_friction > 1);
+	ERR_FAIL_COND_MSG(p_friction < 0 || p_friction > 1, "Friction must be between 0 and 1.");
 
 	if (physics_material_override.is_null()) {
 		physics_material_override.instance();
@@ -216,7 +216,7 @@ void StaticBody::set_bounce(real_t p_bounce) {
 
 	WARN_DEPRECATED_MSG("The method set_bounce has been deprecated and will be removed in the future, use physics material instead.");
 
-	ERR_FAIL_COND(p_bounce < 0 || p_bounce > 1);
+	ERR_FAIL_COND_MSG(p_bounce < 0 || p_bounce > 1, "Bounce must be between 0 and 1.");
 
 	if (physics_material_override.is_null()) {
 		physics_material_override.instance();