What methods can I use to ensure precision in my raycasting while maneuvering the mouse over various sections of a LineSegment?

Question

What methods can I use to ensure precision in my raycasting while maneuvering the mouse over various sections of a LineSegment?

I have created a demonstration for drawing a LineSegment using three.js. I have implemented vertexColors in the material and assigned colors to the vertices. When hovering over different parts of the LineSegment, I change the color of the selected vertex (along with its adjacent vertices in the order they were added to the geometry.vertices array). This way, the line changes color based on the vertex picked by the raycaster.

You can view the example on jsfiddle: https://jsfiddle.net/sounakgarai/tedmc2f0/3/

The problem I'm facing is that the hover accuracy is not ideal; the Linesegment changes color even when the mouse cursor is far away from it (you can observe this when you run the code). I am aiming for precise accuracy, where the color change occurs only when the cursor is directly on the LineSegment.

Is it possible to achieve this level of accuracy?

javascript three.js

Answer 1

Answer №1

Remember to consider the position of your container on the screen, it may not be at [0, 0].

To account for this, you can utilize the .getBoundingClientRect() method to obtain the bounding rectangle of your container and adjust the mouse coordinates accordingly in your event listener.

var rect;
. . .

// inside the event listener
rect = myDiv.getBoundingClientRect();

mouse.x = ((event.clientX - rect.left) / container.clientWidth) * 2 - 1;
mouse.y = -((event.clientY - rect.top) / container.clientHeight) * 2 + 1;

Here is an example on jsfiddle

PS: Just a tip, the interface of jsfiddle.net includes a Tidy button that helps format your code for better readability.

Answer 2

Remember to consider the position of your container on the screen, it may not be at [0, 0].

To account for this, you can utilize the .getBoundingClientRect() method to obtain the bounding rectangle of your container and adjust the mouse coordinates accordingly in your event listener.

var rect;
. . .

// inside the event listener
rect = myDiv.getBoundingClientRect();

mouse.x = ((event.clientX - rect.left) / container.clientWidth) * 2 - 1;
mouse.y = -((event.clientY - rect.top) / container.clientHeight) * 2 + 1;

Here is an example on jsfiddle

PS: Just a tip, the interface of jsfiddle.net includes a Tidy button that helps format your code for better readability.

What methods can I use to ensure precision in my raycasting while maneuvering the mouse over various sections of a LineSegment?

Answer №1

Similar questions

Retrieve the previous URL for redirection purposes

Are there any techniques for running unit tests on a Vue.js transition?

How to nullify the valueChanges pipe in Angular RxJS until the observable is resolved

Make the mp3 file automatically download/save as by forcing the link

Mongoose Error: The function 'mongooseSchemahere' is not recognized as a valid function

What is the best way to add an element from a parent component to an array within a child component in a Vue 3 application?

How can one determine the dimensions of the browser window using a property?

The data for my registration is not getting stored in the Firebase database as expected

Initiate an Ajax call to pre-fetch video content

The Mysteries of Key Codes in JavaScript

Guide on triggering a modal upon receiving a function response in React

Is it possible to modify the cell color or highlight in Excel through Node.js?

Basic application - angular has not been declared

Ways to retrieve the value of an Object that may have a key that is undefined

fade out row upon successful deletion using ajax

Assistance required: Click on the button to select and copy all text within the specified paragraph ID

Using jQuery to update text for corresponding element upon input change

The Toggle Button labeled "ENTER VR" is unresponsive within three.js

Execute a post request upon clicking with NEXT JS, while also firing off a get request

toggle switch for numerical input