Lighting | Control LIFX lights from your Mac | Notification library

I tried to export GLTF model from Blender to Three.js. It works. But I have some artifacts on Three.js with lighting and painting. I have lines and squares in Three.js and I don't know why.

I used only Principled BSDF node in Blender to painting my model. If I set material in Three.js (MeshPhongMaterial) it works fine. But not with Principled BSDF node from Blender. Any ideas?

I'm trying to make the object cast a shadow and react to the lighting. This works well with MeshPhongMaterial and with Principled BSDF. But in the second option, I don't like these black stripes.

With three.js, I render earth with textures. I also add an emissive texture to add the city light. But I have an issue, even the light areas of earth emit the cities light.

Exemple:

It is possible to render the emissive texture lighting only in dark areas? I don't find any ways.

My texture is set like this:

Just to give some context, there is an iOS app I'm building (in Xamarin) that requires the ability to fetch files (in an automatic way without having the user to navigate to the files and select them manually) that are stored on External Storage Devices (USB Sticks), and are connected (paired) to an iPhone/iPad.

Users connect a lighting cable to the iOS Devices, and plug their USB Sticks into this lighting cable. Here is an example of the cable that end users use to pair the USB Sticks with their iPhone/iPad, and the app then auto fetches these files from the USB Storage Devices.

The app then performs 2 functions:

1. It listens to notifications, for when a usb stick is paired with the iOS Device.
2. When it receives this notification, it then proceeds with querying the files on the USB Stick, and reads and processes the files. The app reads these files automatically and the user does not need to manually select these files

I've tried using External Accessory Framework, however that's only suitable for devices that you register with the MFi program. https://developer.apple.com/documentation/externalaccessory

Notifications Center never seems to work (the Notifications that handle when a Device gets Connected and Disconnected, the delegates never get called), and I've tried using the Microsoft Helpers.

https://docs.microsoft.com/en-us/dotnet/api/externalaccessory.eaaccessorymanager.notifications.observedidconnect?view=xamarin-ios-sdk-12

I've also tried some 3rd party libraries, but haven't found anything useful.

It doesn't look Apple has any Api Available to auto query and read the files, without having to use a DocumentPickerController. I know this is because of the App Sandbox, and I cannot directly access the Removable Storage Devices.

Now for my questions:

1. Are there any 3rd party libraries anybody can recommend, that can help achieve most of the heavy lifting for this task? I'd prefer a library that's compatible with Xamarin, however if it's a native library (Swift or Objective-C Library, Cocoapods) I'm sure there is a binding I can use on nuget.
2. Does anybody have any snippets, or documentation, or can point me in the right direction here (Please feel free to post Swift, or Objective-c solutions here if you like)? Where should I look, which Apple Framework (iOS SDK) is most suitable to deal with this situation. And to summarise, is what I'm asking for at all possible on iOS, without having to jailbreak, or get around the App Sandbox?

Update

So I've tried the solution that @Saamer suggested: Detect if USB is connected to iPhone device

Here is an example I wrote just to verify if the callback gets invoked, and the app can detect if a usb is plugged in.

Lately when using Jupyter Notebook in VS Code to write some assignments for my studies I ran into a quite annoying problem - whenever there is a mistake in my code cell that prevents it from running, the "traceback" (or however you call it) to the place where the error persists is colored with a high-contrast marker (the color depends on the theme used) and makes the content pretty much invisible unless you manually "select" it with the mouse coursor. Is there any way I could fix it without going too much in-depth into VSCode/Jupyter Notebook extension settings?

The highlighting looks like shown below.

Yellow syntax marker problem.

And another one here.

I tried all the themes preinstalled with VS Code such as Monokai, Solarized Light etc., and also a custom theme of my choice called Dracula.

Thanks in advance.

I'm currently making a 2D game in Javascript, but I want to the game to have different lighting levels, for example, if I were to create a day and night cycle. However, I want to be able to cut holes in the lighting/foreground, or do something so that I can make certain parts of the screen lit up, for example like a flashlight or candle. Note: I'm also using the P5.js library.

The most obvious idea that came to mind for going about in creating a foreground is just creating a rectangle with some opacity that covers the entire screen. This is good, but how am I supposed cut through this? Obviously, the code below won't work because I'm just layering on another element, and the rectangle is still obstructed and not perfectly clear.

I Am New To Ursana Engine And I Don't Know It Properly. But I Can Make Games In It. But The Problem Is That My Game Doesn't Have Any . So My Game Looks Dead.

Is There Any Way To Make My Game Look Good Using In Ursana Engine?

I have a group of related variables in a struct, each struct member is of basic type. I declared a uniform of that struct type, and want to use foo.a, foo.b, etc in my shader.

I'm using the technique described here (code, demo) for using video frames as WebGL textures, and the simple scene (just showing the image in 2D, rather than a 3D rotating cube) from here.

The goal is a Tampermonkey userscript (with WebGL shaders, i.e. video effects) for YouTube.

The canvas is filled grey due to gl.clearColor(0.5,0.5,0.5,1). But the next lines of code, which should draw the frame from the video, have no visible effect. What part might be wrong? There are no errors.

I tried to shorten the code before posting, but apparently even simple WebGL scenes require a lot of boilerplate code.

It is a kind of weird phenomena that I found out. There is a very simple example, I have an ARSCNView which is empty, just rootnode and camera, so it means that the camera is open, but there is nothing on the screen (just camera).

There is a method that I call from the viewDidLoad() { printAllScene(node: scnView.scene.rootNode) } in order to print all the nodes on the scene