bool Scene::loadScene(std::string sceneName) {
//Get scene file path
std::string file = PathReader::getPath("", sceneName.c_str(), "xml");
//Load scene file.
tinyxml2::XMLDocument doc;
doc.LoadFile(file.c_str());
//Invalid xml.
if(doc.ErrorID() != XML_NO_ERROR) {
cubeMappingSkybox = nullptr;
light = nullptr;
errorDescription = "Scene file doesn't exists.";
return true;
}
//Variable used to flag the scene as erroneous.
bool errorsInScene = false;
//Get scene type.
//Assume spectral as default.
std::string sceneType = doc.RootElement()->Attribute("type");
sceneType = sceneType == "" ? "Spectral" : sceneType;
//Read camera.
XMLElement* cameraElement = doc.RootElement()->FirstChildElement("camera");
errorsInScene = errorsInScene || setupCamera(cameraElement);
//Light.
const XMLElement* lightElement = doc.RootElement()->FirstChildElement("light");
const XMLElement* lightOrigin = lightElement->FirstChildElement("origin");
if(lightElement) {
std::string lightType = lightElement->Attribute("type");
if(sceneType == "RGB") {
bool rgbLightCreation = setupRGBLight(lightElement, lightOrigin, lightType);
errorsInScene = errorsInScene || rgbLightCreation;
} else {
bool spectralLightCreation = setupSpectralLight(lightElement, lightOrigin, lightType);
errorsInScene = errorsInScene || spectralLightCreation;
}
} else {
errorDescription = errorDescription + "The scene doesn't contain any light.\n";
errorsInScene = true;
}
//Eventually set a cube mapping skybox.
setupSkyboxWithCubeMapping(doc);
//Objects
XMLElement *objectsElement = doc.RootElement()->FirstChildElement("objects");
if(!objectsElement) {
errorDescription = errorDescription + "The scene doesn't contain any object.\n";
errorsInScene = true;
}
//Init geometric objects.
for(XMLElement *objectElement = objectsElement->FirstChildElement("object");
objectElement != NULL;
objectElement = objectElement->NextSiblingElement("object")) {
std::string type = objectElement->Attribute("type");
//Object creation
Model* object;
bool objectCreation = setupObject(&object, objectElement);
errorsInScene = errorsInScene || objectCreation;
//Object material creation.
const XMLElement* material = objectElement->FirstChildElement("material");
if(sceneType == "RGB") {
bool materialRGBCreation = setupRGBObjectMaterial(object, material);
errorsInScene = errorsInScene || materialRGBCreation;
} else {
bool materialBRDFCreation = setupBRDFObjectMaterial(object, material);
errorsInScene = errorsInScene || materialBRDFCreation;
}
//add object.
objects.push_back(object);
}
//Init polygonal mesh.
for(XMLElement *objectElement = objectsElement->FirstChildElement("mesh");
objectElement != NULL;
objectElement = objectElement->NextSiblingElement("mesh")) {
const XMLElement* objFile = objectElement->FirstChildElement("objFile");
bool backFaceCulling = false;
if(attributesExist(objFile, {"backFaceCulling"})) {
backFaceCulling = objFile->FindAttribute("backFaceCulling")->BoolValue();
}
std::string objName = objFile->Attribute("name");
std::string objFilePath = PathReader::getPath("OBJs", objName.c_str(), "obj");
ObjParser objParser;
objParser.parseObj(objFilePath.c_str(), backFaceCulling);
std::vector<Model *> pList = objParser.getPolygonalShapes();
const XMLElement* material = objectElement->FirstChildElement("material");
for(std::vector<Model *>::size_type i = 0; i != pList.size(); i++) {
if(sceneType == "RGB") {
bool materialRGBCreation = setupRGBObjectMaterial(pList[i], material);
errorsInScene = errorsInScene || materialRGBCreation;
} else {
bool materialBRDFCreation = setupBRDFObjectMaterial(pList[i], material);
errorsInScene = errorsInScene || materialBRDFCreation;
}
}
//Setup AABB.
const XMLElement* aabbElement = objectElement->FirstChildElement("aabb");
AxisAlignedBoundingBox aabb;
setupAABB(aabb, aabbElement);
//Create mesh.
Model* mesh = new PolygonalMesh(pList, aabb);
//Add mesh.
objects.push_back(mesh);
}
//SCLT specific configuration.
errorsInScene = errorsInScene || setupSCLTParameter(doc, sceneType);
return errorsInScene;
}