modifying the vertex color of a line in threejs based on individual vertices

Question

modifying the vertex color of a line in threejs based on individual vertices

I'm working on a project in three.js where I have a line passing through points of a particle cloud. Currently, I am using a canvas renderer and looking to add some randomness by varying the color of the line from vertex to vertex. I came across an example that demonstrated this concept:

However, after spending hours trying to adapt it to my simpler scenario, I haven't been able to figure out how to adjust just the colors of the line. The ThreeJS documentation on vertexMaterial is unhelpful, and the information on lines only discusses adjusting the color of the line as a whole (line.material.color).

My current code looks like this:

line = new THREE.Line( geometry, new THREE.LineBasicMaterial( { color: lineColor, opacity: lineVars.lineOpacity } ) );

If anyone has a simpler explanation or solution for how to achieve random color variations on the line, I would greatly appreciate your help.

javascript three.js

Answer 1

Answer №1

(You can see an example of the function in action here: http://example.com)

This is the method I used to create axes lines in three different colors:

function drawAxes(length) {
    length || (length = 5000);

    function vector(x,y,z) {
        return new THREE.Vector3(x,y,z);
    }

    var colors = [0xFF0000, 0x00FF00, 0x0000FF]
    for (var axis = 0; axis<3; axis++) {
        var lineGeo = new THREE.Geometry();
        var from = [0, 0, 0], to = [0, 0, 0];
        from[axis] = -length;
        to[axis] = length;
        lineGeo.vertices.push(vector.apply(null, from), vector.apply(null, to));
        var lineMat = new THREE.LineBasicMaterial({
            color: colors[axis],
            lineWidth: 1
        });
        var line = new THREE.Line(lineGeo, lineMat);
        line.type = THREE.Lines;
        scene.add(line);
    }
};

Alternatively, you can follow these simpler steps:

Create a material with a specific color:

var lineMat = new THREE.LineBasicMaterial({color: 0xFF0000, lineWidth: 1});

Create a line using the material:

var line = new THREE.Line(lineGeo, lineMat);

Add the line to the scene

Answer 2

(You can see an example of the function in action here: http://example.com)

This is the method I used to create axes lines in three different colors:

function drawAxes(length) {
    length || (length = 5000);

    function vector(x,y,z) {
        return new THREE.Vector3(x,y,z);
    }

    var colors = [0xFF0000, 0x00FF00, 0x0000FF]
    for (var axis = 0; axis<3; axis++) {
        var lineGeo = new THREE.Geometry();
        var from = [0, 0, 0], to = [0, 0, 0];
        from[axis] = -length;
        to[axis] = length;
        lineGeo.vertices.push(vector.apply(null, from), vector.apply(null, to));
        var lineMat = new THREE.LineBasicMaterial({
            color: colors[axis],
            lineWidth: 1
        });
        var line = new THREE.Line(lineGeo, lineMat);
        line.type = THREE.Lines;
        scene.add(line);
    }
};

Alternatively, you can follow these simpler steps:

Create a material with a specific color:

var lineMat = new THREE.LineBasicMaterial({color: 0xFF0000, lineWidth: 1});

Create a line using the material:

var line = new THREE.Line(lineGeo, lineMat);

Add the line to the scene

modifying the vertex color of a line in threejs based on individual vertices

Answer №1

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