html - Canvas 3D drawing using both 2D and 3D context

Question

Since the webgl/opengl doesn't support text drawing, so it possible to draw 3D object using 3D context and text drawing using 2D context ?

Answer 1

No, unfortunately not.

The HTML 5 spec says that if you call getContext on a canvas element that is already in a different context mode and the two contexts are not compatible then return null.

Unfortunately "webgl" and "2d" canvases are not compatible and thus you will get null:

var canvas = document.getElementById('my-canvas');
var webgl = canvas.getContext("webgl"); // Get a 3D webgl context, returns a context
var twod = canvas.getContext("2d"); // Get a 2D context, returns null