How to render image through RenderTexture & Camera?

Question

Unity

How to render a fixed area of ​​12 : 8 units so that the render result is 100 texels per unit (as by default)?

Answer 1

and what is the actual problem?
consider the resolution of the render texture. create the right size. and from camera render to texture.
get a picture of the desired resolution.
problem multiplying density by size?