Three.js line vector to cylinder?

Question

I have this to create a line between 2 points:

var geometry = new THREE.Geometry();
geometry.vertices.push(new THREE.Vector3(0, 0, 0));
geometry.vertices.pus         


        

Answer 1

I figured I would post this since the answers didn't get me 100% there. I noticed the cylinders were correctly oriented, but they were positioned in reference to the origin. The below code (based on the other answers to this question) worked for me:

function cylinderMesh(pointX, pointY, material) {
    var direction = new THREE.Vector3().subVectors(pointY, pointX);
    var orientation = new THREE.Matrix4();
    orientation.lookAt(pointX, pointY, new THREE.Object3D().up);
    orientation.multiply(new THREE.Matrix4(1, 0, 0, 0,
                                           0, 0, 1, 0,
                                           0, -1, 0, 0,
                                           0, 0, 0, 1));
    var edgeGeometry = new THREE.CylinderGeometry(2, 2, direction.length(), 8, 1);
    var edge = new THREE.Mesh(edgeGeometry, material);
    edge.applyMatrix(orientation);
    // position based on midpoints - there may be a better solution than this
    edge.position.x = (pointY.x + pointX.x) / 2;
    edge.position.y = (pointY.y + pointX.y) / 2;
    edge.position.z = (pointY.z + pointX.z) / 2;
    return edge;
}

Hope this helps someone!

Answer 2

I found that only one point can be matched, so I edit it( change pointX to pointY) as below and it works

edge.position = new
THREE.Vector3().addVectors(pointY,direction.multiplyScalar(0.5));

Answer 3

ArrowHelper since pull request #3307 are based on quaternions.

This works in three.js r58:

    var cylinderMesh = function(point1, point2, material)
    {
        var direction = new THREE.Vector3().subVectors(point2, point1);
        var arrow = new THREE.ArrowHelper(direction.clone().normalize(), point1);

        var rotation = new THREE.Vector3().setEulerFromQuaternion(arrow.quaternion);

        var edgeGeometry = new THREE.CylinderGeometry( 2, 2, direction.length(), 10, 4 );

        var edge = new THREE.Mesh(edgeGeometry, material);
        edge.rotation = rotation.clone();
        edge.position = new THREE.Vector3().addVectors(point1, direction.multiplyScalar(0.5));

        return edge;
    }