matrix.js | Where Matrices become heroes | Graphics library

I am trying to render an indexed cube (with duplicate vertices to achieve flat shading). I set up a position buffer, an indices buffer, set the shader inputs and draw it using gl.drawElements(gl.TRIANGLES, ...):

However, on the screen, I only see the vertices, but the triangles are not being rendered.

I have put prints with gl.getError() after each gl call, but all return 0 (no error). Here is the live demo (the cube can be rotated by clicking and dragging on the canvas):

I'm trying to learn the basics of webgl and following the MDN tutorial here.

However, my rendering script (render.js) does not recognize the included gl-matrix script. Running index.html in Chrome(Version 88.0.4324.150 (Official Build) (64-bit)) I expect to see a red square against a black background. Instead, I get a black background and the following console error:

I have prepared Cloud Formation template, json format, below:

I have been trying to use my own matrices in WebGL (2d at the moment). My main reference is webglfundamentals.com. I multiply a 360-degree rotation with a (1, -1) scale, (-142, 6) translation, and a projection matrix. My rectangle shows up fine, but without a translation. Here is my code:

I'm trying to make a FPS camera in WebGL. When I move the camera from the initial position and then rotate, the camera moves along the start position instead of the new position. The translation and rotation are made with glMatrix.js library.

I have the variables:

I'm trying to create a Chord Diagram using D3.js to show the relationship between different clients and suppliers, but I keep getting the following error when running the page, and here's my code:

Uncaught TypeError: d3.queue is not a function at chord.html:47

I'm trying to work strictly using native ES Modules without transpiling my own code but often times I will find a third party library that is packaged with Webpack and babel as a UMD which seems to be the most common format these days.

This doesn't import so well

I am using Form.io v3.27.1, and I am trying to create a custom layout component - specifically an accordion - and I'm using the concepts provided in the CheckMatrix component example for the most part.

I am able to make the accordion component show in the toolbox, and I'm able to drag it onto the form, configure it with a custom edit form etc. I can save it and it renders a Bootstrap themed accordion perfectly.

What it does NOT do however, is allow me to drag and drop other components into the content area similar to the behavior of other layout components (i.e. Tabs, Columns, Fieldset etc.).

I assume by skimming through the source code of the other layout controls that I need to extend NestedComponent in lieu of BaseComponent, but I've not yet been able to make that work.

I feel like I am overlooking something small. I just can't seem to figure out how to render a layout component that accepts other Form.io components as children.

Anyone have a working example or suggestions I can try to get this working? I appreciate your help in advance!

I just started learning webgl GLSL.I recently had a strange problem that almost killed my life. I wrote a simple cube texture rendering code, and I used the normal vector in the fragment shader to add some special effects. This code basically works the same on Windows as I expected, but it shows me a black screen on macos and ios, and then I tested the Android system, which is as normal as on Windows. I guess there is a difference between the windows platform and the macos platform. There are some secrets I don't know. Are there any good people who are willing to help me, thank you! Here is the vertex shader: