Exploring the possibilities of Obj file manipulation with threejs- Selection, updating, and transforming

Question

Exploring the possibilities of Obj file manipulation with threejs- Selection, updating, and transforming

I'm currently working on an application for 3D Visualization and Interactivity using threejs.
Here are the main functionalities I aim to include in this project:

In this app, users should be able to:

Rotate and Scale the Object - completed
Manipulate specific parts of the Object, such as changing its color or replacing a part with another - pending

I have been referring to the extensive threejs documentation and the list of helpful examples provided, which has greatly assisted me in making progress.

I also found a useful Chrome extension called ThreeJS Inspector.

This ThreeJS Inspector Chrome Extension seems to fulfill all my requirements; however, I am struggling to comprehend how it functions and allows selection and manipulation of the parts within an Object file.

Currently, I am utilizing the following block of code with threejs to solely display, rotate, and scale the Object file.

Updated Code:

 //The code block goes here

If anyone can offer assistance with this, it would be greatly appreciated. Thank you in advance, and please provide feedback if there is anything I may have overlooked.

Update

Next Challenges

While I can change the color of a specific node (part of the object), it requires clicking on the canvas/object again to view the changes instantly.
Although I can hide/show a particular node (part of the object), I aspire to replace that specific node (part of the object) with another one.
I intend to save the final object file as an image after implementing all modifications. In the future, I aim to save it as a GIF or video to enable users to visualize a 360-degree view of the end product.

PS

TheJim01 has been instrumental in helping me understand the fundamental but crucial concept of traversing the object file and its components. This insight has brought me closer to achieving my desired outcome.

javascript three.js

Answer 1

Answer №1

The three.js inspector tool simply analyzes the scene and presents the properties of the objects in an interactive user interface.

Imagine you have an OBJ file structured like this:

car
  body
  wheels
    frontLeft
    frontRight
    rearLeft
    rearRight
  windows
    front
    back

By using OBJLoader, a scene hierarchy is created as follows:

car // THREE.Group
  body // THREE.Mesh
  wheels // THREE.Group
    frontLeft // THREE.Mesh
    frontRight // THREE.Mesh
    rearLeft // THREE.Mesh
    rearRight // THREE.Mesh
  windows // THREE.Group
    front // THREE.Mesh
    back // THREE.Mesh

The three.js inspector visually represents this hierarchy by object names. Clicking on an object in the tree links to the corresponding object in the scene, displaying its properties such as position, rotation, visible status, etc. Changes made in the three.js inspector UI are directly reflected on the actual scene object.

Creating a map of object name to scene object for quick referencing can be executed with code similar to this:

var nameToObject = {};
scene.traverse(function(node){
    nameToObject[node.name] = node;
});

This approach allows for easy access and modification of object properties based on their assigned names.

For instance, adjusting the size of an object named "frontLeftWheel" can be achieved through:

nameToObject["frontLeftWheel"].scale.addScalar(0.1);

You can also manipulate material properties of objects, like changing the color of the "body" to red:

nameToObject["body"].material.color.setRGB(1.0, 0.0, 0.0);

Replacing objects within the scene, such as swapping out the "rearLeftWheel" with a new mesh called "newRearLeftWheel", can be accomplished with code like this:

var wheels = nameToObject["wheels"]; // parent of rearLeftWheel
wheels.remove(nameToObject["rearLeftWheel"]);
wheels.add(newRearLeftWheel);

These examples serve as a starting point for working with object properties in three.js. If you encounter any issues while accessing your data, feel free to ask for clarification.

Answer 2

The three.js inspector tool simply analyzes the scene and presents the properties of the objects in an interactive user interface.

Imagine you have an OBJ file structured like this:

car
  body
  wheels
    frontLeft
    frontRight
    rearLeft
    rearRight
  windows
    front
    back

By using OBJLoader, a scene hierarchy is created as follows:

car // THREE.Group
  body // THREE.Mesh
  wheels // THREE.Group
    frontLeft // THREE.Mesh
    frontRight // THREE.Mesh
    rearLeft // THREE.Mesh
    rearRight // THREE.Mesh
  windows // THREE.Group
    front // THREE.Mesh
    back // THREE.Mesh

The three.js inspector visually represents this hierarchy by object names. Clicking on an object in the tree links to the corresponding object in the scene, displaying its properties such as position, rotation, visible status, etc. Changes made in the three.js inspector UI are directly reflected on the actual scene object.

Creating a map of object name to scene object for quick referencing can be executed with code similar to this:

var nameToObject = {};
scene.traverse(function(node){
    nameToObject[node.name] = node;
});

This approach allows for easy access and modification of object properties based on their assigned names.

For instance, adjusting the size of an object named "frontLeftWheel" can be achieved through:

nameToObject["frontLeftWheel"].scale.addScalar(0.1);

You can also manipulate material properties of objects, like changing the color of the "body" to red:

nameToObject["body"].material.color.setRGB(1.0, 0.0, 0.0);

Replacing objects within the scene, such as swapping out the "rearLeftWheel" with a new mesh called "newRearLeftWheel", can be accomplished with code like this:

var wheels = nameToObject["wheels"]; // parent of rearLeftWheel
wheels.remove(nameToObject["rearLeftWheel"]);
wheels.add(newRearLeftWheel);

These examples serve as a starting point for working with object properties in three.js. If you encounter any issues while accessing your data, feel free to ask for clarification.

Exploring the possibilities of Obj file manipulation with threejs- Selection, updating, and transforming

Updated Code:

Answer №1

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