sizeAttenuation for sprites?

[makc]

following things seem to be removed from sprites:

• affectedByDistance Sprite parameters change for size #278
• scaleByViewport Add optional parameter, scaleByViewport, to Sprite.js #279

meanwhile, sizeAttenuation exists for points. can we have it for sprites, too? seems like rather typical use case

[Mugen87]

I only know size attenuation in combination with points. THREE.Sprite is based on a plane geometry (so it's effectively a billboard). I've never seen size attenuation in this context.

[makc]

Well, it is always the case for me. Pins on globes/maps, text labels, etc.

[makc]

It just seems to be solveable so much easier in the shader. Right now I am doing this hack:

tmp.copy (sprite.position);
camera.worldToLocal (tmp); if (tmp.z < 0) {
	sprite.scale.setScalar (-scale * tmp.z);
	sprite.updateMatrixWorld (true);

and it gets tiresome

[mrdoob]

I think this is a valid request.