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2D/3D CAD design in JavaScript

I am having 2D design in microstation and I wanted to represent this design in web using any tool(javascript/Unity 3D or any other) where the web tool will not have all the functionality but basic functionality like reshaping or adding a new shape should be available.
As of now, my approach is once I created a design in microstation then I am capturing properties of shapes like the cordinates of a line and now using these coordinates I wanted to represent in the browser since this is a 2D design so it will be plotted in some location (x,y) for example I have created a line in microstation from (2,2) to (10,10) so it will be a straight line and I have all the coordinates I tried redrawing it in Unity which am able to do but I am facing issue to change the length from (2,2) to (20,20) by mouse click. And my goal is to do it in runtime, not in Unity editor tool.
This is an example of a straight line I wanted to do it for all geometric shape,any guidance would be appreciated.
As of now am trying Unity to do so but struggling in the edit part is there a way to achieve this in unity?
I also looked at various javascript libraries like konvaJS, makerJS, ThreeJS, etc. but except konvajs none of the other library provide facilities like reshaping, in Konva also creating shape using a mouse not found any solution for this.
Can we achieve this by any of the two approaches, of course, am not looking for all functionality only a few custom functionality, if yes which approach will be the best, and which tool should I proceed with?
Any guidance will be helpful.

To draw a line-segment, you can use LineRenderer.
//two points of the line-segment are known (or got from the Transform of GameObject)
Vector3 start;
Vector3 end;
GameObject myLine = new GameObject();
myLine.transform.position = start;
myLine.AddComponent<LineRenderer>();
LineRenderer lr = myLine.GetComponent<LineRenderer>();
lr.material = new Material(Shader.Find("Particles/Alpha Blended Premultiply"));
lr.SetColors(color, color);
lr.SetWidth(0.1f, 0.1f);
lr.SetPosition(0, start);
lr.SetPosition(1, end);
//to change the points of this line
myLine.transform.position = another_start;
lr.SetPosition(0, another_start);
lr.SetPosition(1, another_end);
There are also other solutions:
Use scaled cube or capsule primitive.
3rd-party plugins: vectrosity
To get mouse clicked position, use Camera.main.ScreenToWorldPoint(Input.mousePosition).
To determine when your mouse is clicked, use Input.GetMouseButtonUp.

Is it possible to rotate one side of CubeTexture in three js?

I'm new in three.js, so I ask you for advice.
I use CubeTexture as envMap for my materials to make my objects looks like steel.
loader = new THREE.CubeTextureLoader();
this.cubeTexture = loader.load([
posXUrl, negXUrl,
posYUrl, negYUrl,
posZUrl, negZUrl
]);
...
mesh.material.envMap = this.textureCube;
And everything is ok with it but I want to make one enhancement in my scene.
The thing is that floor (negYUrl) on CubeTexture is static, but my scene assumes that floor is rotated. Unfortunately didn't find any API that allow to rotate buttom side of TextureCube instance.
Could you help me and point me on techniques that allow to do such things?

Text with inset shadow three.js

I need to create text with inset shadow on my object in three.js, which looks like this:
Something like ring with engraved text.

I think the easier way to do that would be to use a normal-map for the engraving, at least if the text doesn't have to be dynamic (here's how you can export a normal-map from blender). And even if it needs to be dynamic it might be easier to create a normal-map dynamically in a canvas than to actually create a geometry for the engraving.
Another option would be to actually create a geometry that contains the engraving. For that you might want to look at the ThreeCSG-library, that let's you use boolean operators on geometries: You create the 3D-text mesh, warp and align it to the curvature of the ring and finally subtract it from the ring-mesh. This should give you the ring with the engraving spared out.
In fact, I was curious how this would actually work out and implemented something very similar here: https://usefulthink.github.io/three-text-warp-csg/ (source here).
In essence, This is using ThreeCSG to subtract a text-geometry from a cylinder-geometry like so:
const textBSP = new ThreeBSP(textGeometry);
const cylinderBSP = new ThreeBSP(cylinderGeometry);
const resultGeometry = cylinderBSP.subtract(textBSP).toGeometry();
scene.add(new THREE.Mesh(resultGeometry, new THREE.MeshStandardMaterial());
Turns out that the tessellation created by threeCSG really slow (I had to move it into a worker so the page doesn't freeze for almost 10 seconds). It doesn't look too good right now, as there is still a problem with the computed normals that i haven't figured out yet.
The third option would be to use a combination of displacement and normal-maps.
This would be a lot easier and faster in processing, but you would need to add a whole lot of vertices in order to have vertices available where you want an displacement to happen. Here is a small piece of code by mrdoob that can help you with creating the normal-map based on the displacement: http://mrdoob.com/lab/javascript/height2normal/

Collision detection with boundingSphere

For each mesh (THREE.Object3D) Three.js provide a very handy properties - boundingSphere and boundingSphere that have intersectsSphere and isIntersectionBox methods.
With all this I thought I can use it for simple collision detection but when I try it appears that collision happens all the time because (I tried boundingSphere) boundingSphere.center is always in (0, 0, 0); So If I want to check collisions between 2 meshes I should for each object - clone boundingSphere object and then get it world coordinates and only then to use intersectsSphere.
something like this:
var bs = component.object.geometry.boundingSphere.clone();
bs.center.setFromMatrixPosition(component.object.matrixWorld);
...
if (_bs.intersectsSphere(bs)){
is this how it suppose to be used or am I missing something and there are more convenient way of doing collisions detection based on boundingBox/boundingSphere?

If you want to do collision detection with bounding boxes you need the boxes in the world coordinate system. The bounding volumes in the intersectsSphere and isIntersectionBox properties of the mesh are in the local coordinate system of the object.
You can do like you did: clone the volumes and move them to the correct position in the world coordinate system, that is a good solution.
Otherwise you can also set a new box from your meshes and do collision using those boxes. Let's say you have a THREE.Mesh called mesh then you can do:
sphere = new THREE.Sphere.setFromPoints( mesh.vertices );
box = new THREE.Box3.setFromObject( mesh );
A little tip. During development it can be nice to see the bounding boxes in your scene, for this you can use the THREE.BoundingBoxHelper:
var helper = new THREE.BoundingBoxHelper( mesh );
scene.add( helper );

Stop merging of 3D objects when rotated using three.js

I have placed 3d objects with translateZ. They look good when paused and are placed on top/bottom of each other. But when I rotate the scene these objects merger. Can someone tell me how to get rid of this issue ?
Black block is on top of brown, but when I rotate the object, positions got disturb.

I see you have large faces in the models, I think that's a z-buffer problem.
Try logarithmic depth buffer and see whats happens:
var renderer = new THREE.WebGLRenderer({logarithmicDepthBuffer: true});