Re: [Interest] Qt3D How to draw 2D-Text always facing the Camera
Then I would stay with the first solution I proposed, it will be more flexible in your case: regular text2dentity with custom frame graph branch and custom camera. There is just one thing to be aware about the text2dentity, the entity doesn't do the rendering itself: it contains another entity which is taking card of the rendering (DistanceFieldTextRenderer). So if you use a layer filter and attach it to the text2dentity, you should set it to be recursive to affect the rendering child entity. Moreover this "rendering" entity set by default some render states, like the depth test, which may be boring to achieve the exact rendering you want (in my case it is ...). david On 19-Dec-18 11:14, Volker Enderlein wrote: The number of Text2D elements is not known in advance and may differ. It's a simulation environment, where some textual information is added to a fairly high number of elements. To avoid the data management for different kinds of entities my first idea was to create a specialized Text2d entity that handles all the gory details in a custom material and provides an option to always face the camera. Cheers Volker Am 19.12.2018 um 08:37 schrieb david crémoux: You're welcome. I will most probably have to implement the same feature in a near future for the project I'm currently working on. If making the custom camera is too much complex, there is a more basic way but involving more data management (depending on how much 2d text entities you have to display): You still use a specific frame graph branch with a layer filter but with an identity camera. Then you attach all your 2d text entities to your scene root entity and you update their transform/position on every camera transform/move. david On 19-Dec-18 10:05, Volker Enderlein wrote: Hi David, thanks for the answer. I wasn't thinking of that, as my knowledge about framegraphs is very limited. But this helps me further. Cheers Volker Am 18.12.2018 um 14:53 schrieb david crémoux: Hello Volker, I guess you can achieve it with regular QText2DEntity, with a specific frame graph branch in your rendering for your 2d text, a layer filter and a custom camera (based on your main camera). david On 18-Dec-18 14:37, Volker Enderlein wrote: Hi all, when building a rather complex Qt3D-Scene I needed some 2D-Text that has a 3D position, is always facing the camera, and fixed in size, independent of the camera settings. While looking over the components provided by Qt3D I stumbled across Text2DEntity and thought about how it can be tweaked ot fulfill my requirements. As all my requirements can be done inside a shader I thought about whether the QText2DMaterial that is used inside the class can be replaced by a custom material. But unfortunately the material is not accessible from outside. Text2DEntity can be embedded in another class that applies the camera information to it, but is there an easier solution to this problem? Cheers Volker ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt3D How to draw 2D-Text always facing the Camera
You're welcome. I will most probably have to implement the same feature in a near future for the project I'm currently working on. If making the custom camera is too much complex, there is a more basic way but involving more data management (depending on how much 2d text entities you have to display): You still use a specific frame graph branch with a layer filter but with an identity camera. Then you attach all your 2d text entities to your scene root entity and you update their transform/position on every camera transform/move. david On 19-Dec-18 10:05, Volker Enderlein wrote: Hi David, thanks for the answer. I wasn't thinking of that, as my knowledge about framegraphs is very limited. But this helps me further. Cheers Volker Am 18.12.2018 um 14:53 schrieb david crémoux: Hello Volker, I guess you can achieve it with regular QText2DEntity, with a specific frame graph branch in your rendering for your 2d text, a layer filter and a custom camera (based on your main camera). david On 18-Dec-18 14:37, Volker Enderlein wrote: Hi all, when building a rather complex Qt3D-Scene I needed some 2D-Text that has a 3D position, is always facing the camera, and fixed in size, independent of the camera settings. While looking over the components provided by Qt3D I stumbled across Text2DEntity and thought about how it can be tweaked ot fulfill my requirements. As all my requirements can be done inside a shader I thought about whether the QText2DMaterial that is used inside the class can be replaced by a custom material. But unfortunately the material is not accessible from outside. Text2DEntity can be embedded in another class that applies the camera information to it, but is there an easier solution to this problem? Cheers Volker ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] Qt3D How to draw 2D-Text always facing the Camera
Hello Volker, I guess you can achieve it with regular QText2DEntity, with a specific frame graph branch in your rendering for your 2d text, a layer filter and a custom camera (based on your main camera). david On 18-Dec-18 14:37, Volker Enderlein wrote: Hi all, when building a rather complex Qt3D-Scene I needed some 2D-Text that has a 3D position, is always facing the camera, and fixed in size, independent of the camera settings. While looking over the components provided by Qt3D I stumbled across Text2DEntity and thought about how it can be tweaked ot fulfill my requirements. As all my requirements can be done inside a shader I thought about whether the QText2DMaterial that is used inside the class can be replaced by a custom material. But unfortunately the material is not accessible from outside. Text2DEntity can be embedded in another class that applies the camera information to it, but is there an easier solution to this problem? Cheers Volker ___ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
Re: [Interest] [Qt3D] any way to synchronize main thread with render thread ?
My mistake: I'm not on OnDemand render policy. On 18.01.2018 10:04, david crémoux wrote: Hello, While using Qt3D I'm trying to separate as much as possible the scene, rendering, and render window/widget. I'm not using Qt3DWindow, I'm using my own widget/surface. The thing is, when I'm deleting my widget, I'm not deleting everything like in Qt3DWindow (scene, rendering, aspect, etc.). But even if I'm setting a null surface to the rendering before physically deleting my widget/surface, the surface is still in use in the rendering thread : it crashes (on swapBuffers). Is there a way to synchronize/wait for next frame with the render thread so I can be sure that my widget/surface is not used anymore so I can delete it freely? I'm using Qt 5.9.3, c++, no QML, and I set an OnDemand render policy. regards, david ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] [Qt3D] any way to synchronize main thread with render thread ?
Hello, While using Qt3D I'm trying to separate as much as possible the scene, rendering, and render window/widget. I'm not using Qt3DWindow, I'm using my own widget/surface. The thing is, when I'm deleting my widget, I'm not deleting everything like in Qt3DWindow (scene, rendering, aspect, etc.). But even if I'm setting a null surface to the rendering before physically deleting my widget/surface, the surface is still in use in the rendering thread : it crashes (on swapBuffers). Is there a way to synchronize/wait for next frame with the render thread so I can be sure that my widget/surface is not used anymore so I can delete it freely? I'm using Qt 5.9.3, c++, no QML, and I set an OnDemand render policy. regards, david ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
Re: [Interest] [Qt3D] 5.10.0 crash with OpenGL ES 2.0 on desktop
On 18.12.2017 13:44, Konstantin Tokarev wrote: 18.12.2017, 09:05, "david crémoux" <da...@adeko.com>: Hello, I have a crash when forcing to use opengl es on desktop for 5.10.0 version (via: QApplication::setAttribute(Qt::AA_UseOpenGLES)). It comes from QT3D_UNIFORM_TYPE_IMPL (graphicscontext_p.h:366), m_rawByteSize is set to 0. Looking at the sources it seems that m_rawByteSize is never initialized for opengl es 2.0 (for other api, it is correctly initialized in programUniformsAndLocations). Or am I doing something wrong? Documentation says: "Forces the usage of OpenGL ES 2.0 or higher on platforms that use dynamic loading of the OpenGL implementation" AFAIK dynamic loading is used only on Windows with `-opengl dynamic` configuration. What platfrom are you using? I'm using windows 10 with Qt 5.10 64 bits as precompiled dynamic libraries (the ones that come with maintenance tool). I traced from where the crash is coming from using sources. GraphicsHelperES2 is used during runtime to compile shaders so I expect OpenGL ES 2.0 (i.e.: angle) is indeed used. regards, david ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
[Interest] [Qt3D] 5.10.0 crash with OpenGL ES 2.0 on desktop
Hello, I have a crash when forcing to use opengl es on desktop for 5.10.0 version (via: QApplication::setAttribute(Qt::AA_UseOpenGLES)). It comes from QT3D_UNIFORM_TYPE_IMPL (graphicscontext_p.h:366), m_rawByteSize is set to 0. Looking at the sources it seems that m_rawByteSize is never initialized for opengl es 2.0 (for other api, it is correctly initialized in programUniformsAndLocations). Or am I doing something wrong? regards, david ___ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
