This will happen if you are not using our RTL-SDR Blog drivers. V4 units require our custom drivers to work. Please follow the instructions carefully. This is most likely due to your USB port underpowering the RTL-SDR. This can easily happen with long USB cables, or unpowered hubs. Please try connecting the RTL-SDR directly to the PC to confirm. If you experience problems with SDR#, SDR++ is our second choice software that we also highly recommend. The default renderer does not do any CPU-side viewport clipping nor occlusion detection. If something is not supposed to be visible, it should not be shown. Use Item::visible: false for items that should not be drawn. The primary reason for not adding such logic is that it adds additional cost which would also hurt applications that took care in behaving well. Focus on your target audience. Only in this case, you will represent the information the right way.

First, if you already have some other drivers installed, please purge them from your system using the following commands: sudo apt purge

ORIGINAL RESEARCH article

From Qt 6.0 onwards, the default adaptation always renders via a graphics abstraction layer, the Qt Rendering Hardware Interface (RHI), provided by the Qt GUI module. This means that, unlike Qt 5, no direct OpenGL calls are made by the scene graph. Rather, it records resource and draw commands by using the RHI APIs, which then translate the command stream into OpenGL, Vulkan, Metal, or Direct 3D calls. Shader handling is also unified by writing shader code once, compiling to SPIR-V, and then translating to the language appropriate for the various graphics APIs. In addition to the public API, the scene graph has an adaptation layer which opens up the implementation to do hardware specific adaptations. This is an undocumented, internal and private plugin API, which lets hardware adaptation teams make the most of their hardware. It includes: Copy the ExtIO_RTL.dll file into the HDSDR install folder which is by default set to C:\Program Files (x86)\HDSDR.

I have a modern Ryzen based motherboard with USB 3.0/3.1 and no software can detect and run my RTL-SDR. Some material flags prevent batching, the most limiting one being QSGMaterial::RequiresFullMatrix which prevents all batching.I get the error "rtlsdr_demod_write_reg failed with -9" on command line based software like rtl_fm, rtl_test, the bias tee software etc. While using rtl_eeprom, I bumped or disconnected my dongle during an EEPROM write, and now the VID and PID's are all 0000 and the dongle isn't recognized! The Scene Graph - Vulkan Under QML example gives an example on how to use these signals using Vulkan. The Scene Graph - OpenGL Under QML example gives an example on how to use these signals using OpenGL. As stated in the beginning, understanding the finer details of the renderer is not required to get good performance. It is written to optimize for common use cases and will perform quite well under almost any circumstances.

QSGSimpleTextureNode - a QSGGeometryNode subclass which defines a rectangular geometry with a texture material. The Scene Graph - Direct3D 11 Under QML example gives an example on how to use these signals using Direct3D. When designing a QSG, the most important question is how to filter out the most basic instructions that are the most useful to the average user. [2] [3] The answer to this question primarily depends on two things: the ability of the QSG writer to place himself in the shoes of the user and the product itself. As for the latter: a product that basically only needs some instructions to install it properly after which it functions continuously, is relatively easy to ‘capture’ in a QSG. Also, products that offer a broad variety of tasks of which in reality only a few really matter, lend themselves for a QSG. [3] An example of such a product would be a software application. If the main tasks in such an application would be not more than a handful, then a QSG on a double-sided card could be an effective solution. If tasks would become more complicated of nature, one can refer to the complete manual. First become a user, then a writer. Only after you get familiar with the product you are ready to look at it the way your audience does. Issuing either QRhi-based or OpenGL, Vulkan, Metal, Direct3D commands directly before or after the scene graph's own rendering. This in effect prepends or appends a set of draw calls into the main render pass. No additional render target is used.And remember to select the correct demodulation mode for the signal you are tuned to via the "Radio" menu on the left. If you are using a RTL-SDR.com V3 dongle, view our V3 users guide to learn how to use the special features like HF direct sampling and the bias tee. If it is a newer V4 dongle, visit our V4 users guide.