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bounds = get_shape_bounds(shape);
width = bounds.x2 - bounds.x1;
height = bounds.y2 - bounds.y1;
for (i = 0; i < shape->num_vertices; ++i) {
	delta_x = shape->vertices[i].x - bounds.x1;
	delta_y = shape->vertices[i].y - bounds.y1;
	shape->vertices[i].u = width > 0 ? delta_x / width : 0.0;
	shape->vertices[i].v = height > 0 ? delta_y / height : 1.0;
}

static void
assign_default_uv(shape_t* shape)
{
	double phi;

	int i;

	for (i = 0; i < shape->num_vertices; ++i) {
		phi = 2 * M_PI * i / shape->num_vertices - M_PI_4 * 3; // counterclockwise offset 135 degrees
		shape->vertices[i].u = (cos(phi) * M_SQRT2 + 1.0) / 2.0;
		shape->vertices[i].v = (sin(phi) * M_SQRT2 + 1.0) / 2.0;
	}
}

Threads.initialize();
// ...
var tid = Threads.create(obj);
// obj has .update() and optional .render() called once per frame

var worker = Threads.create(obj);
// do some stuff, and then later, perhaps during an update:
Threads.join(worker); // block until worker terminates

// note: the below calls SetUpdateScript(); and SetRenderScript() intrinsically:
Threads.initialize();

// if `obj` is an object with .update() and .render() methods:
var threadID = Threads.create(obj);

// or perhaps to encapsulate a threaded thing:
this.threadID = Threads.create(this); // on construction
Threads.kill(this.threadID); // on disposal

// to create a makeshift thread for any object:
var vertices = [ /* ... */ ];
var texture = new Image("myTexture.png");
var shape = new Shape(vertices, texture);
var group = new Group([ shape ], shader);
Threads.createEx(group, {
    update: function() { return true; },
    render: function() { this.draw(); }
});

// to block until a thread finishes:
// (it is safe to call .join() in a thread updater--that thread will block
// but other threads will continue happily humming along!)
Threads.join(threadID);

RequireSystemScript('mini/threads.js');
RequireSystemScript('mini/delegate.js');

Last 4 lines after entering test map:
[image 4731] Cache miss!
[image 4731] Creating new pixel cache
[image 4731] get_image_pixel() using pixel cache
[image 4731] Dropped pixel cache

Last 4 lines after ONE attack:
[image 5868] get_image_pixel() using pixel cache
[image 5885] get_image_pixel() using pixel cache
[image 5868] get_image_pixel() using pixel cache
[image 5885] get_image_pixel() using pixel cache