Three.js Update Texture Image

I'm using three.js to create a minecraft texture editor, similar to this. I'm just trying to get the basic click-and-paint functionality down, but I can't seem to figure it out. I

Solution 1:

When you update a texture, whether its based on canvas, video or loaded externally, you need to set the following property on the texture to true:

If an object is created like this:

var canvas = document.createElement("canvas");
var canvasMap = new THREE.Texture(canvas)
var mat = new THREE.MeshPhongMaterial();
mat.map = canvasMap;
var mesh = new THREE.Mesh(geom,mat);

After the texture has been changed, set the following to true:

cube.material.map.needsUpdate = true;

And next time you render the scene it'll show the new texture.

Solution 2:

Here is all the basics of what you have to know about "updating" stuff in three.js: https://threejs.org/docs/#manual/introduction/How-to-update-things