Multiple Resolution Sprites (HD/UD)

I don't have any thing implemented for this yet. But i have 2 resolutions of sprites extracted from texture packer

Assets/Sprite/HD/Gamesheet.png (100 Pixels per unit/Mipmaps Off)
Assets/Sprite/UD/Gamesheet.png (200 Pixels per unit/Mipmaps Off)

Now I can replace these files back and forth in editor to get the resolutions required.
Question 1) - Can I do the switching runtime before textures get loaded based on device resolution.

If No this should have been a built in feature

Proceeding further i can attach a custom script to all sprite renderer to Change the texture on runtime That of course would cause both HD/UD textures to present in memory which is bad.

I can remove default sprite and only load required sprite but in this case i won't be able to see any sprite in editor that i guess would be a pain for a game within constant development. Any Thoughts on this?

Even If i can manage that not seeing any sprite in sprite. How can i handle this with my Animations referencing sprite changes.

That I guess could be done by creating a custom float variable in my custom script and changing it from Animation (adding frame for float var) and load sprite based on that custom float index to search my sprite list and change the image. That would of course lead to going blind even without stick. I think that would be hard to manage the game source. Any Thoughts on this also.

Also, I'm looking for a solution within unity. I can't use 2D Toolkit as i will have to change all sprite renderers etc. I guess i haven't used it.

 

WoW. No Answer Yet!!

 

Not sure if it helps, but this video had some sd/hd switch mentioned (and example scripts in the description link)

 

There is no simple way to do this in Unity. Check out this thread: http://forum.unity3d.com/threads/working-multi-resolution-sprite-sheets.274683/