How Can I add an element textbox on the canvas in special coordinates

[Mugen87]

Since it seems you want to convert coordinates from world space into 2D screen space, you can used the approach that was outlined in the following topic:

How to converting world coordinates to 2D mouse coordinates in ThreeJS

vector.project( camera ); This only converts a vector to normalized device space. You still have to map the vector to 2D screen space. Something like: vector.x = ( vector.x + 1) * width / 2; vector.y = - ( vector.y - 1) * height / 2; vector.z = 0; width and height represent the dimensions of the canvas (renderer.domElement).