better obj parsing & gui scene saving support

- do a better job at parsing OBJs with multiple objects
- correctly save XML scenes when there is no integrator or sampler

include/mitsuba/render/trimesh.h

@@ -14,6 +14,11 @@ public:
 	/// Create a new, empty triangle mesh with the given triangle and vertex count
 	TriMesh(size_t triangleCount, size_t vertexCount);
 
+	/// Create a new, empty triangle mesh with the specified data
+	TriMesh(const std::string &name, Transform worldToObject,
+		Triangle *triangles, size_t triangleCount, 
+		Vertex *vertexBuffer, size_t vertexCount);
+
 	/// Unserialize a triangle mesh
 	TriMesh(Stream *stream, InstanceManager *manager);
 

src/librender/scene.cpp

@@ -184,13 +184,17 @@ void Scene::configure() {
 		m_integrator->configure();
 	}
 	if (m_camera == NULL) {
-		Log(EWarn, "No camera found -- adding a default camera");
+		Log(EWarn, "No camera found! Adding a default camera.");
 
 		Properties props("perspective");
 		/* Create a perspective camera with 45deg. FOV, which can see the whole scene */
 		AABB aabb;
 		for (size_t i=0; i<m_shapes.size(); ++i)
 			aabb.expandBy(m_shapes[i]->getAABB());
+		for (size_t i=0; i<m_media.size(); ++i)
+			aabb.expandBy(m_media[i]->getAABB());
+		if (!aabb.isValid())
+			Log(EError, "Unable to set up a default camera -- does the scene contain anything at all?");
 		Point center = aabb.getCenter();
 		Vector extents = aabb.getExtents();
 		Float maxExtents = std::max(extents.x, extents.y);

src/librender/shape.cpp

@@ -91,7 +91,7 @@ void Shape::addChild(const std::string &name, ConfigurableObject *child) {
 		Log(EError, "Shape: Invalid child node!");
 	}
 }
-	
+
 /// Ray intersection test
 bool Shape::rayIntersect(const Ray &ray, Intersection &its) const {
 	Log(EError, "Not implemented!");

src/librender/trimesh.cpp

@@ -8,10 +8,20 @@
 MTS_NAMESPACE_BEGIN
 
 TriMesh::TriMesh(size_t triangleCount, size_t vertexCount) 
- : Shape(Properties()), m_triangleCount(triangleCount), m_vertexCount(vertexCount) {
+ : Shape(Properties()), m_triangleCount(triangleCount),
+ 		m_vertexCount(vertexCount), m_flipNormals(false) {
 	m_triangles = new Triangle[m_triangleCount];
 	m_vertexBuffer = new Vertex[m_vertexCount];
-	m_flipNormals = false;
+}
+	
+TriMesh::TriMesh(const std::string &name, Transform worldToObject, Triangle *triangles, 
+	size_t triangleCount, Vertex *vertexBuffer, size_t vertexCount) 
+	: Shape(Properties()), m_triangles(triangles), m_triangleCount(triangleCount), 
+	m_vertexBuffer(vertexBuffer), m_vertexCount(vertexCount), m_flipNormals(false) {
+	m_name = name;
+	m_worldToObject = worldToObject;
+	m_objectToWorld.inverse();
+
 }
 
 TriMesh::TriMesh(const Properties &props) 

src/luminaires/area.cpp

@@ -117,10 +117,17 @@ public:
 	}
 
 	void setParent(ConfigurableObject *parent) {
-		ConfigurableObject::setParent(parent);
-
 		if (parent->getClass()->derivesFrom(Shape::m_theClass)) {
-			m_shape = static_cast<Shape *>(parent);
+			Shape *shape = static_cast<Shape *>(parent);
+			if (shape->isCompound())
+				return;
+
+			if (m_parent)
+				Log(EError, "An area light source cannot be parent of multiple shapes");
+			
+			ConfigurableObject::setParent(shape);
+
+			m_shape = shape;
 			parent->configure();
 			m_surfaceArea = m_shape->getSurfaceArea();
 		} else {

src/mitsuba/shandler.h

@@ -39,9 +39,9 @@ public:
 	inline Scene *getScene() { return m_scene; }
 
 	inline std::string transcode(const XMLCh * const xmlName) const {
-		const char *value = XMLString::transcode(xmlName);
+		char *value = XMLString::transcode(xmlName);
 		std::string result(value);
-		delete[] value;
+		XMLString::release(&value);
 		return result;
 	}
 

src/qtgui/save.cpp

@@ -164,7 +164,7 @@ void saveScene(QWidget *parent, SceneContext *ctx, const QString &targetFile) {
 	QDomElement newSampler, sampler = findUniqueChild(camera, "sampler");
 	if (sampler.isNull()) {
 		newSampler = doc.createElement("sampler");
-		camera.appendChild(sampler);
+		camera.appendChild(newSampler);
 	} else {
 		newSampler = doc.createElement("sampler");
 		camera.insertAfter(newSampler, sampler);
@@ -224,16 +224,13 @@ void saveScene(QWidget *parent, SceneContext *ctx, const QString &targetFile) {
 	// ====================================================================
 
 	QDomElement oldIntegratorNode = findUniqueChild(root, "integrator");
-	if (oldIntegratorNode.isNull()) {
-		QMessageBox::critical(parent, parent->tr("Unable to save"),
-			parent->tr("Unable to save changes: could not find the integrator descriptor in "
-			"<b>%1</b>. If you are using include files, make sure that the integrator "
-			"descriptor is located within the main scene file.").arg(ctx->fileName),
-			QMessageBox::Ok);
-		return;
-	}
-
 	QDomElement newIntegratorNode = doc.createElement("integrator");
+	if (oldIntegratorNode.isNull()) {
+		film.appendChild(oldIntegratorNode);
+	} else {
+		film.insertAfter(newIntegratorNode, oldIntegratorNode);
+		film.removeChild(oldIntegratorNode);
+	}
 
 	const Integrator *integrator = ctx->scene->getIntegrator();
 	setProperties(doc, newIntegratorNode, integrator->getProperties());

src/shapes/obj.cpp

@@ -29,9 +29,10 @@ public:
 		std::vector<Normal> normals;
 		std::vector<Point2> texcoords;
 		std::vector<OBJTriangle> triangles;
+		bool hasNormals = false, hasTexcoords = false;
+		bool firstVertex = true;
 
-		bool hasNormals = false;
-		bool hasTexCoords = false;
+		std::string name = m_name;
 
 		while (is >> buf) {
 			if (buf == "v") {
@@ -39,6 +40,18 @@ public:
 				Point p;
 				is >> p.x >> p.y >> p.z;
 				vertices.push_back(m_objectToWorld(p));
+				if (firstVertex) {
+					if (triangles.size() > 0) {
+						generateGeometry(name, vertices, normals, texcoords, 
+							triangles, hasNormals, hasTexcoords);
+						triangles.clear();
+					}
+					hasNormals = false;
+					hasTexcoords = false;
+					firstVertex = false;
+				}
+			} else if (buf == "mtllib") {
+				cout << "Got mtllib" << endl;
 			} else if (buf == "vn") {
 				Normal n;
 				is >> n.x >> n.y >> n.z;
@@ -47,18 +60,23 @@ public:
 				else
 					normals.push_back(n);
 				hasNormals = true;
+			} else if (buf == "g") {
+				std::string line;
+				std::getline(is, line);
+				name = line.substr(1, line.length()-2);
 			} else if (buf == "vt") {
 				std::string line;
 				Float u, v, w;
 				std::getline(is, line);
 				std::istringstream iss(line);
 				iss >> u >> v >> w;
-				hasTexCoords = true;
 				texcoords.push_back(Point2(u, v));
+				hasTexcoords = true;
 			} else if (buf == "f") {
 				std::string line, tmp;
 				std::getline(is, line);
 				std::istringstream iss(line);
+				firstVertex = true;
 				OBJTriangle t;
 				iss >> tmp; parse(t, 0, tmp);
 				iss >> tmp; parse(t, 1, tmp);
@@ -74,66 +92,8 @@ public:
 			}
 		}
 
-		std::vector<Vertex> vertexBuffer(vertices.size());
-		std::vector<bool> touched(vertices.size());
-		for (unsigned int i=0; i<vertices.size(); i++) {
-			vertexBuffer[i].v = vertices[i];
-			touched[i] = false;
-		}
-
-		/* Collapse the mesh into a more usable form */
-		m_triangles = new Triangle[triangles.size()];
-		for (unsigned int i=0; i<triangles.size(); i++) {
-			Triangle tri;
-			for (unsigned int j=0; j<3; j++) {
-				unsigned int vertexId = triangles[i].v[j];
-				unsigned int normalId = triangles[i].n[j];
-				unsigned int uvId = triangles[i].uv[j];
-
-				if (touched[vertexId] == false) {
-					if (hasNormals)
-						vertexBuffer[vertexId].n = normals[normalId];
-					if (hasTexCoords)
-						vertexBuffer[vertexId].uv = texcoords[uvId];
-					touched[vertexId] = true;
-					tri.idx[j] = vertexId;
-				} else {
-					bool safe = true;
-					if (hasNormals && vertexBuffer[vertexId].n 
-							!= normals[normalId])
-						safe = false;
-					if (hasTexCoords && vertexBuffer[vertexId].uv 
-							!= texcoords[uvId])
-						safe = false;
-					if (!safe) {
-						/* This vertex was used in conjunction with a different
-						   normal / texture coordinate. Now we have to duplicate
-						   it. */
-						Vertex vertex;
-						vertex.v = vertices[vertexId];
-						if (hasNormals)
-							vertex.n = normals[normalId];
-						if (hasTexCoords)
-							vertex.uv = texcoords[uvId];
-						tri.idx[j] = vertexBuffer.size();
-						vertexBuffer.push_back(vertex);
-					} else {
-						tri.idx[j] = vertexId;
-					}
-				}
-			}
-			m_triangles[i] = tri;
-		}
-		m_vertexBuffer = new Vertex[vertexBuffer.size()];
-		for (unsigned int i=0; i<vertexBuffer.size(); i++)
-			m_vertexBuffer[i] = vertexBuffer[i];
-		m_triangleCount = triangles.size();
-		m_vertexCount = vertexBuffer.size();
-
-		calculateTangentSpaceBasis(hasNormals, hasTexCoords);
-	}
-	
-	WavefrontOBJ(Stream *stream, InstanceManager *manager) : TriMesh(stream, manager) {
+		generateGeometry(name, vertices, normals, texcoords, 
+			triangles, hasNormals, hasTexcoords);
 	}
 
 	void parse(OBJTriangle &t, int i, const std::string &str) {
@@ -157,7 +117,135 @@ public:
 		}
 	}
 
+
+	void generateGeometry(const std::string &name,
+			const std::vector<Point> &vertices,
+			const std::vector<Normal> &normals,
+			const std::vector<Point2> &texcoords,
+			const std::vector<OBJTriangle> &triangles,
+			bool hasNormals, bool hasTexcoords) {
+		if (triangles.size() == 0)
+			return;
+		Log(EInfo, "Creating geometry \"%s\"", name.c_str());
+		std::vector<Vertex> vertexBuffer(vertices.size());
+		std::vector<bool> touched(vertices.size());
+		for (unsigned int i=0; i<vertices.size(); i++) {
+			vertexBuffer[i].v = vertices[i];
+			vertexBuffer[i].n = Normal(0, 0, 1);
+			touched[i] = false;
+		}
+
+		/* Collapse the mesh into a more usable form */
+		Triangle *triangleArray = new Triangle[triangles.size()];
+		for (unsigned int i=0; i<triangles.size(); i++) {
+			Triangle tri;
+			for (unsigned int j=0; j<3; j++) {
+				unsigned int vertexId = triangles[i].v[j];
+				unsigned int normalId = triangles[i].n[j];
+				unsigned int uvId = triangles[i].uv[j];
+
+				if (touched[vertexId] == false) {
+					if (hasNormals)
+						vertexBuffer[vertexId].n = normals.at(normalId);
+					if (hasTexcoords)
+						vertexBuffer[vertexId].uv = texcoords.at(uvId);
+					touched[vertexId] = true;
+					tri.idx[j] = vertexId;
+				} else {
+					bool safe = true;
+					if (hasNormals && vertexBuffer.at(vertexId).n 
+							!= normals.at(normalId))
+						safe = false;
+					if (hasTexcoords && vertexBuffer.at(vertexId).uv 
+							!= texcoords.at(uvId))
+						safe = false;
+					if (!safe) {
+						/* This vertex was used in conjunction with a different
+						   normal / texture coordinate. Now we have to duplicate
+						   it. */
+						Vertex vertex;
+						vertex.v = vertices.at(vertexId);
+						if (hasNormals)
+							vertex.n = normals.at(normalId);
+						if (hasTexcoords)
+							vertex.uv = texcoords.at(uvId);
+						tri.idx[j] = vertexBuffer.size();
+						vertexBuffer.push_back(vertex);
+					} else {
+						tri.idx[j] = vertexId;
+					}
+				}
+			}
+			triangleArray[i] = tri;
+		}
+
+		Vertex *vertexArray = new Vertex[vertexBuffer.size()];
+		for (unsigned int i=0; i<vertexBuffer.size(); i++) 
+			vertexArray[i] = vertexBuffer[i];
+
+		ref<TriMesh> mesh = new TriMesh(name, m_worldToObject, triangleArray, 
+			triangles.size(), vertexArray, vertexBuffer.size());
+		mesh->incRef();
+		mesh->calculateTangentSpaceBasis(hasNormals, hasTexcoords);
+		m_meshes.push_back(mesh);
+	}
+	
+	WavefrontOBJ(Stream *stream, InstanceManager *manager) : TriMesh(stream, manager) {
+	}
+
+	virtual ~WavefrontOBJ() {
+		for (size_t i=0; i<m_meshes.size(); ++i)
+			m_meshes[i]->decRef();
+	}
+	
+	void configure() {
+		Shape::configure();
+
+		m_aabb.reset();
+		for (size_t i=0; i<m_meshes.size(); ++i) {
+			m_meshes[i]->configure();
+			m_aabb.expandBy(m_meshes[i]->getAABB());
+		}
+	}
+	
+	void addChild(const std::string &name, ConfigurableObject *child) {
+		const Class *cClass = child->getClass();
+		if (cClass->derivesFrom(BSDF::m_theClass)) {
+			m_bsdf = static_cast<BSDF *>(child);
+			for (size_t i=0; i<m_meshes.size(); ++i) 
+				m_meshes[i]->addChild(name, child);
+		} else if (cClass->derivesFrom(Luminaire::m_theClass)) {
+			Assert(m_luminaire == NULL && m_meshes.size() == 1);
+			m_luminaire = static_cast<Luminaire *>(child);
+			for (size_t i=0; i<m_meshes.size(); ++i) {
+				child->setParent(m_meshes[i]);
+				m_meshes[i]->addChild(name, child);
+			}
+		} else if (cClass->derivesFrom(Subsurface::m_theClass)) {
+			Assert(m_subsurface == NULL);
+			m_subsurface = static_cast<Subsurface *>(child);
+			for (size_t i=0; i<m_meshes.size(); ++i) { 
+				child->setParent(m_meshes[i]);
+				m_meshes[i]->addChild(name, child);
+			}
+		} else {
+			Shape::addChild(name, child);
+		}
+	}
+
+	bool isCompound() const {
+		return true;
+	}
+
+	Shape *getElement(int index) {
+		if (index >= (int) m_meshes.size())
+			return NULL;
+		return m_meshes[index];
+	}
+
 	MTS_DECLARE_CLASS()
+private:
+	std::vector<TriMesh *> m_meshes;
 };
 
 MTS_IMPLEMENT_CLASS_S(WavefrontOBJ, false, TriMesh)