Batch of lightmapper fixes and minor improvements

- Fix objects with no material being considered as fully transparent by the lightmapper.
- Added "environment_min_light" property: gives artistic control over the shadow color.
- Fixed "Custom Color" environment mode, it was ignored before.
- Added "interior" property to BakedLightmapData: controls whether dynamic capture objects receive environment light or not.
- Automatically update dynamic capture objects when the capture data changes (also works for "energy" which used to require object movement to trigger the update).
- Added "use_in_baked_light" property to GridMap: controls whether the GridMap will be included in BakedLightmap bakes.
- Set "flush zero" and "denormal zero" mode for SSE2 instructions in the Embree raycaster. According to Embree docs it should give a performance improvement.

servers/visual/rasterizer.h

@@ -514,6 +514,8 @@ public:
 	virtual int lightmap_capture_get_octree_cell_subdiv(RID p_capture) const = 0;
 	virtual void lightmap_capture_set_energy(RID p_capture, float p_energy) = 0;
 	virtual float lightmap_capture_get_energy(RID p_capture) const = 0;
+	virtual void lightmap_capture_set_interior(RID p_capture, bool p_interior) = 0;
+	virtual bool lightmap_capture_is_interior(RID p_capture) const = 0;
 	virtual const PoolVector<LightmapCaptureOctree> *lightmap_capture_get_octree_ptr(RID p_capture) const = 0;
 
 	/* PARTICLES */

servers/visual/visual_server_raster.h

@@ -396,6 +396,9 @@ public:
 	BIND2(lightmap_capture_set_energy, RID, float)
 	BIND1RC(float, lightmap_capture_get_energy, RID)
 
+	BIND2(lightmap_capture_set_interior, RID, bool)
+	BIND1RC(bool, lightmap_capture_is_interior, RID)
+
 	/* PARTICLES */
 
 	BIND0R(RID, particles_create)

servers/visual/visual_server_scene.cpp

@@ -1085,6 +1085,13 @@ void VisualServerScene::_update_instance(Instance *p_instance) {
 		VSG::storage->particles_set_emission_transform(p_instance->base, p_instance->transform);
 	}
 
+	if (p_instance->base_type == VS::INSTANCE_LIGHTMAP_CAPTURE) {
+		InstanceLightmapCaptureData *capture = static_cast<InstanceLightmapCaptureData *>(p_instance->base_data);
+		for (List<InstanceLightmapCaptureData::PairInfo>::Element *E = capture->geometries.front(); E; E = E->next()) {
+			_instance_queue_update(E->get().geometry, false, true);
+		}
+	}
+
 	if (p_instance->aabb.has_no_surface()) {
 		return;
 	}
@@ -1441,6 +1448,7 @@ void VisualServerScene::_update_instance_lightmap_captures(Instance *p_instance)
 	for (int i = 0; i < 12; i++)
 		new (&p_instance->lightmap_capture_data.ptrw()[i]) Color;
 
+	bool interior = true;
 	//this could use some sort of blending..
 	for (List<Instance *>::Element *E = geom->lightmap_captures.front(); E; E = E->next()) {
 		const PoolVector<RasterizerStorage::LightmapCaptureOctree> *octree = VSG::storage->lightmap_capture_get_octree_ptr(E->get()->base);
@@ -1456,6 +1464,7 @@ void VisualServerScene::_update_instance_lightmap_captures(Instance *p_instance)
 		Vector3 pos = to_cell_xform.xform(p_instance->transform.origin);
 
 		const float capture_energy = VSG::storage->lightmap_capture_get_energy(E->get()->base);
+		interior = interior && VSG::storage->lightmap_capture_is_interior(E->get()->base);
 
 		for (int i = 0; i < 12; i++) {
 
@@ -1467,6 +1476,7 @@ void VisualServerScene::_update_instance_lightmap_captures(Instance *p_instance)
 			p_instance->lightmap_capture_data.write[i] += capture;
 		}
 	}
+	p_instance->lightmap_capture_data.write[0].a = interior ? 0.0f : 1.0f;
 }
 
 bool VisualServerScene::_light_instance_update_shadow(Instance *p_instance, const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, RID p_shadow_atlas, Scenario *p_scenario) {

servers/visual/visual_server_wrap_mt.h

@@ -330,6 +330,8 @@ public:
 	FUNC1RC(int, lightmap_capture_get_octree_cell_subdiv, RID)
 	FUNC2(lightmap_capture_set_energy, RID, float)
 	FUNC1RC(float, lightmap_capture_get_energy, RID)
+	FUNC2(lightmap_capture_set_interior, RID, bool)
+	FUNC1RC(bool, lightmap_capture_is_interior, RID)
 
 	/* PARTICLES */
 

servers/visual_server.cpp

@@ -1830,6 +1830,8 @@ void VisualServer::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("lightmap_capture_get_octree", "capture"), &VisualServer::lightmap_capture_get_octree);
 	ClassDB::bind_method(D_METHOD("lightmap_capture_set_energy", "capture", "energy"), &VisualServer::lightmap_capture_set_energy);
 	ClassDB::bind_method(D_METHOD("lightmap_capture_get_energy", "capture"), &VisualServer::lightmap_capture_get_energy);
+	ClassDB::bind_method(D_METHOD("lightmap_capture_set_interior", "capture", "interior"), &VisualServer::lightmap_capture_set_interior);
+	ClassDB::bind_method(D_METHOD("lightmap_capture_is_interior", "capture"), &VisualServer::lightmap_capture_is_interior);
 #endif
 	ClassDB::bind_method(D_METHOD("particles_create"), &VisualServer::particles_create);
 	ClassDB::bind_method(D_METHOD("particles_set_emitting", "particles", "emitting"), &VisualServer::particles_set_emitting);

servers/visual_server.h

@@ -558,6 +558,8 @@ public:
 	virtual PoolVector<uint8_t> lightmap_capture_get_octree(RID p_capture) const = 0;
 	virtual void lightmap_capture_set_energy(RID p_capture, float p_energy) = 0;
 	virtual float lightmap_capture_get_energy(RID p_capture) const = 0;
+	virtual void lightmap_capture_set_interior(RID p_capture, bool p_interior) = 0;
+	virtual bool lightmap_capture_is_interior(RID p_capture) const = 0;
 
 	/* PARTICLES API */