c# - Scaling a sprite in unity -

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i trying make sprite same proportion screen sizes. there way can scale sprite width , or height compared rest of screen? have tried multiple ways have looked goes on head. there easy way implement this? or way @ in unity? help. here image further trying accomplish.

enter image description here

i want detailed image size of black , green rectangle. help!

i figured out, needed convert pixels per world unit so:

     mathf.abs(camera.main.orthographicsize - (getcomponent<spriterenderer>().sprite.texture.height / getcomponent<spriterenderer>().sprite.pixelsperunit));

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