raycast | A basic raycaster to render a 3d scene | Animation library

I have the following project below created using ThreeJS. You will notice the gold object creates a shadow behind it on a sphere where I'm only rendering the backside so we can see the objects inside. I'm using a point light in the very center of the eye model to create the shadow evenly in all directions. This is the reason the shadow is curved.

I need to know how to get the 3D coordinates (x,y,z) of each pixel of this shadow that was created. For reference here is the code that creates the shadow with a lot removed for simplicity.

I have installed the Ursina game engine recently and I am getting started with it, but as I write a basic program it gives me a traceback contradicting some built in programs in ursina and ending with a Filenotfound Winerror 3 pointing to a music folder which has nothing to do with python, I double checked if Ursina is installed properly but it was not the case, and I checked the folder it is pointing to which as expected contained only music. Is there a problem with the path of the engine? I hope you can answer me. Anyway here is the code:

Thank you for your reading. My English is not good, I'll explain this as well as I can. I need to generate the reflection line in canvas, but it not work well.

I think my problem is the "The formula for calculating the reflected vector".

The mathematics I learned before is not the same as canvas, so I am very confused

This is my code (wrong), you can run this (the first line is right, but the reflection is wrong):

Im making a grappling gun, that pulls an object towards the player if the layer is LightWeight, and pull the player towards the object if the layer is Ground

I wrote a simple web page displaying a 3D bone and using Three.js raycasting to draw dots and lines on it and it worked perfectly well. result of using raycast on full screen web page

But when I ported it to another web page having multiple windows, the process did not work.

I followed the instructions from fiddle http://jsfiddle.net/cn7ecoaa/ but still failed.

Here is the CSS:

Here is a cube of planes that I can click

The main issue with this so far is that clicking on a plane clicks through when I would only want to click the plane that my mouse is over. What am I missing on my Three.js Plane?

I have tried searching for something relating to collision in three.js but to no avail so far.

After further research, I think it has something to do with RayCasting?

I'm trying to create a "Block" input that summons a wall at the position the camera is looking at and have it face the camera's direction. It seems to be using the global coordinates which doesn't make sense to me, because I use the same code to spawn a bullet with no problem. Here's my code:

So i am instantiating cubes and i want to rotate a single cube which i click, however when i click on the cube, all instantiated cubes rotate at the same time, I keep trying with boolean but no success. Any help would be appreciated. UNITY 2D