I try to load gltf by using qSceneLoader
auto sceneObject = new Qt3DRender::QSceneLoader();
sceneObject->setSource(QUrl::fromLocalFile("3D/test.gltf"));
auto sceneTransform = new Qt3DCore::QTransform();
sceneTransform->setTranslation(QVector3D(12.0f, 7.0f, 0.0f));
auto sceneEntity = new Qt3DCore::QEntity(this->rootEntity);
sceneEntity->addComponent(sceneObject);
sceneEntity->addComponent(sceneTransform);
But it gives
Qt3D.GLTFImport: no default scene
Qt3D.Renderer.SceneLoaders: class Qt3DCore::QEntity *__cdecl Qt3DRender::Render::LoadSceneJob::tryLoadScene(class Qt3DRender::Render::Scene *,enum Qt3DRender::QSceneLoader::Status &,const class QStringList &,const class std::function<void __cdecl(class Qt3DRender::QSceneImporter *)> &) Failed to import QUrl("file:3D/test.gltf") with errors ()
This doesn't crash all program but object doesn't appear.
How can I fix it?
If I understood rightly - current version of Qt3D supports only gltf1.0 when blender, which I used for making 3d model exports only to gltf2.0. Using another formats have another issue under windows - qt 5.12.5 on this platform comes without assimp plugins(bug in the installer: https://bugreports.qt.io/browse/QTBUG-75145), so it needs to install newer version for using such stuff.
Related
Can QT 5.12.x and above version support OpenGL sparse texture feature - ARB_sparse_texture - call glTexPageCommitmentARB()?
When I complile the code and get the link error:
"error LNK2019: unresolved external symbol glTexPageCommitmentARB referenced in function xxxx"
Which library in QT5.12.x or above version has this glTexPageCommitmentARB such as support sparse texture functions? Thanks
My configuration:
QT5.12.10(release version download from QT.io, not compile and build by myself)
Visual Studio 2015
add "GL_GLEXT_PROTOTYPES" in "C/C++/Preprocessor" in project properties so that enable the definition of "glTexPageCommitmentARB" in qopenglext.h
#ifdef GL_GLEXT_PROTOTYPES
GLAPI void APIENTRY glTexPageCommitmentARB (GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLboolean commit);
#endif
These libraries are set in project "link/input/additional dependencies“
Qt5OpenGLExtensionsd.lib
Qt53DRenderd.lib
Qt5OpenGLd.lib
Qt5Svgd.lib
Qt5Widgetsd.lib
Qt5Guid.lib
Qt5Networkd.lib
Qt5Xmld.lib
Qt5Cored.lib
OpenGL32.lib
glu32.lib
My project is set to be Mtd like as follow:
QMAKE_CFLAGS_DEBUG =-Zi -MTd
QMAKE_CXXFLAGS_DEBUG = -Zi -MTd
And I tried to convert QString to const character* like this:
QString ss = "sdfdsfdsf";
const char* sst = ss.toStdString().c_str();
Then app crashes, it show the debug assertion failed
(_acrt_first_block == header)
Your sst points to destroyed memory, because you call c_str() on a temporary object which is destroyed right after this line of code finishes its execution.
So it's not a problem of Qt Creator, it's a bug of your code.
I get the below error when i try to open and download .realm file in /tmp directory of serverless framework.
{"errorType":"Runtime.UnhandledPromiseRejection","errorMessage":"Error: posix_fallocate() failed: Operation not permitted" }
Below is the code:
let realm = new Realm({path: '/tmp/custom.realm', schema: [schema1, schema2]});
realm.write(() => {
console.log('completed==');
});
EDIT: this might soon be finally fixed in Realm-Core: see issue 4957.
In case you'll run into this problem elsewhere, here's a workaround.
This caused by AWS Lambda not supporting the fallocate and fallocate64 system calls. Instead of returning the correct error code in this case, which would be EINVAL for not supported on this file system, Amazon has blocked the system call so that it returns EPERM. Realm-Core has code that handles EINVAL return value correctly but will be bewildered by the unexpected EPERM returned from the system call.
The solution is to add a small shared library as a layer to the lambda: compile the following C file on Linux machine or inside lambda-ci Docker image:
#include <errno.h>
#include <fcntl.h>
int posix_fallocate(int __fd, off_t __offset, off_t __len) {
return EINVAL;
}
int posix_fallocate64(int __fd, off_t __offset, off_t __len) {
return EINVAL;
}
Now, compile this to a shared object with something like
gcc -shared fix.c -o fix.so
Then add it to a root of a ZIP file:
zip layer.zip fix.so
Create a new lambda layer from this zip
Add the lambda layer to your lambda function
Finally make the shared object be loaded by configuring the environment value LD_PRELOAD with value /opt/fix.so to your Lambda.
Enjoy.
One of the programs that I work with has two modes that it can run in: GUI (Graphical User Interface) mode or CLI (Command-Line Interface) mode. We determine which mode to use via a command line argument (i.e., if "--cli" is passed, it will use CLI mode).
The type of QApplication that is instantiated depends on which mode is used: QApplication should be used for GUI mode, and QCoreApplication should be used for CLI mode, because the GUI parts of Qt should not be instantiated for CLI mode (since CLI mode does not use or need them).
I can do that via code similar to the following:
std::unique_ptr<QCoreApplication> app =
(cliMode) ? std::make_unique<QCoreApplication>(argc, argv)
: std::make_unique<QApplication>(argc, argv);
// Do some other stuff...
return app->exec();
Since I am already using Qt, it makes sense to use QCommandLineParser to parse my arguments. After parsing the arguments, I want to analyze them to determine whether we should run in GUI mode or CLI mode. However, it has been becoming increasingly difficult to do so.
The first problem I noticed was the following on Linux (this did not happen in older versions of Qt5, but it does happen in the newer versions):
$ ./myQtApplication --help
QCoreApplication::arguments: Please instantiate the QApplication object first
Segmentation fault (core dumped)
Okay: so I can no longer run the --help command without already having a QApplication object instantiated. I temporarily fixed this by manually parsing the arguments to see whether or not --help is an argument. If it is, go ahead and instantiated the QCoreApplication, parse the arguments, and then exit.
But then I started getting a cryptic error on Mac OS X. When I would run the executable on OS X directly, it would run without any issues. But if I tried to double-click on the .app file or type in the terminal $ open myQtApplication.app, I would get this cryptic error:
LSOpenURLsWithRole() failed with error -10810 for the file ./myQtApplication.app
Since it is a rather cryptic error, it took me a long time to figure out that this error was being caused by the QCommandLineParser being used before having a QApplication object instantiated.
To fix this, I am now doing the following:
Manually parse the arguments at the beginning of the main() function to determine whether or not --cli was passed.
Instantiate a QApplication object based on the results of #1.
Run QCommandLineParser to process the rest of the arguments.
This is not a very clean way to do this because I now have two argument parsers: one to determine if --cli was passed, and the rest for the other arguments.
Is there a much better, or "proper", way to do this?
I guess the main question is: can I use QCommandLineParser to determine whether to instantiate a QCoreApplication object or a QApplication object?
Of course you can use the parser - as long as QCoreApplication already present. If the --cli option is absent, you will switch to a QApplication. Recall that you have full control over the lifetime of the application object.
This works under Qt 4.8 and 5.11 on both Windows and OS X:
// https://github.com/KubaO/stackoverflown/tree/master/questions/app-cli-gui-switch-52649458
#include <QtGui>
#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
#include <QtWidgets>
#endif
struct Options {
bool cli;
};
static Options parseOptionsQt4() {
Options opts = {};
for (auto arg : QCoreApplication::arguments().mid(1)) {
if (arg == "--cli")
opts.cli = true;
else
qFatal("Unknown option %s", arg.toLocal8Bit().constData());
}
return opts;
}
static Options parseOptions() {
if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0)) return parseOptionsQt4();
#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
Options opts = {};
QCommandLineParser parser;
QCommandLineOption cliOption("cli", "Start in command line mode.");
parser.addOption(cliOption);
parser.process(*qApp);
opts.cli = parser.isSet(cliOption);
return opts;
#endif
}
int main(int argc, char *argv[]) {
QScopedPointer<QCoreApplication> app(new QCoreApplication(argc, argv));
auto options = parseOptions();
if (options.cli) {
qDebug() << "cli";
} else {
qDebug() << "gui";
app.reset();
app.reset(new QApplication(argc, argv));
}
if (qobject_cast<QApplication *>(qApp))
QMessageBox::information(nullptr, "Hello", "Hello, World!");
QMetaObject::invokeMethod(qApp, "quit", Qt::QueuedConnection);
return app->exec();
}
I'm trying to compile the sitmo prng under C++11 within an R package. The problematic code has been packaged and is available here. The objective of this R package is to make available the sitmo header file so that other packages are able to use the LinkTo field within description. As an added bonus, the package is scheduled to ship with an Armadillo + OpenMP example. There is one other package, mvnfast, that uses sitmo, but only under c++98 and boost headers.
I believe that the error which I am receiving is specific to OS X and clang. I haven't been able to replicate it on Windows via win-build. With that being said, the error is:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/random:3641:44: error: non-type template argument is not a constant expression
const size_t __logR = __log2<uint64_t, _URNG::max() - _URNG::min() + uint64_t(1)>::value;
The error has only popped up on the Rcpp dev list. The resolution in this case was to compile under C++98 and use boost.
The above error is followed by the following notes:
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/random:3773:18: note: in instantiation of function template specialization 'std::__1::generate_canonical<double, 53, sitmo::prng_engine>' requested here
* _VSTD::generate_canonical<_RealType, numeric_limits<_RealType>::digits>(__g)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/random:3737:17: note: in instantiation of function template specialization 'std::__1::uniform_real_distribution<double>::operator()<sitmo::prng_engine>' requested here
{return (*this)(__g, __p_);}
^
sitmo_test.cpp:77:26: note: in instantiation of function template specialization 'std::__1::uniform_real_distribution<double>::operator()<sitmo::prng_engine>' requested here
double u = distunif(engine);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/random:3641:44: note: non-constexpr function 'max' cannot be used in a constant expression
const size_t __logR = __log2<uint64_t, _URNG::max() - _URNG::min() + uint64_t(1)>::value;
^
../inst/include/prng_engine.hpp:100:23: note: declared here
static result_type (max)() { return 0xFFFFFFFF; }
The version of clang being used is:
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.3.0
Thread model: posix
Looking into the code, there is a bug in the sitmo prng_engine.h. min() and max() were declared as
static result_type (min)() { return 0; }
static result_type (max)() { return 0xFFFFFFFF; }
If you take a look at, say, standard LCG max from here, you could see that it is declared constexpr, ditto for min.
As soon as you make those methods constexpr in the sitmo header file, I believe you could use them in template expression.
UPDATE
I've looked into GCC 5 headers, methods indeed are declared constexpr