i don’t. i mean literally that’s all there is to it… make a bunch of crumped up planes, texture them with a transparent cracked texture (literally just photograph some ice cracks and use it like a mask), wedge the planes inside your ice object, then turn off primary visibility. enable glossy refractions on your ice material and you’re good to go
it wasn’t fast but it was simpler than a volumetric shader, especially in vray 6 years ago