Is there a way to edit the dimensions of a gameobject such as a cube or a plane?

[gomlms]

Hi, I am importing a background for my menu, and its dimensions are 1080x1920. However, when I put it on a plane, its obviously stretched and it does not look very good. Is there a way for me to set the dimensions of the plane to be 1080x1920? Thanks

[SrNull]

Did you tried scaling the x, y axis of the plane to make it proportional to the background? ?
By example Scale-> X= 10.8 , Y= 19.2, Z=1.

[robertbu]

First, as @SrNull mentioned, your image must have the same aspect ratio as the original image. If you want to attempt to do pixel perfect, it take a bit more work. For a perspective camera you can find the height in pixels for any given field of view with this equation:

Height = 2 * Tan(0.5 * field_of_view) * distance;

To get the Width, multiple the Height by Screen.Width/Screen.Height. So if you wanted an image to fill the screen but be pixel perfect, pick a distance you want to put the plane and solve for height, or pick a height and solve for distance.

For an orthographic camera, the calculations are simpler:

Hight = 2.0 * OrthographicSize.

With an orthographic camera it is nice to set this up in a way similar to @SrNull numbers would indicate. For a recent project I needed the game size to be 2048 x 1536, so I adjusted the OrthographicSize so that 20.48 x 15.36 would be pixel perfect. It made it easy to size all of my smaller graphics.