Updated readme.

Author: ChemiKhazi

README.md

@@ -4,6 +4,11 @@ A resolution independent pixel perfect camera for Unity.
 
 This package simplifies making a Unity camera render to exact pixel units, for use with pixel art or similar art styles where blockiness is part of the aesthetic.
 
+## Features ##
+
+* Simple setup
+* Perspective camera support
+
 *Standard unity camera*
 
 ![Standard camera](http://i.imgur.com/pye9clh.gif)
@@ -14,25 +19,28 @@ This package simplifies making a Unity camera render to exact pixel units, for u
 
 ## Basic Usage ##
 
-1. Attach the Pixel Camera script to an orthographic camera.
-2. Set the Pixels Per Unit to an appropriate value, usually matching the settings used for your assets.
-3. Set the Zoom Level for the camera.
+1. Attach the `Pixel Camera` script to an existing camera.
+2. Set `Pixels Per Unit` to an appropriate value, usually matching the settings used for your assets.
+3. Set the `Zoom Level` for the camera.
 
-## Advanced Usage ##
+## Advanced Settings ##
 
-* Camera Material - allows a shader to be applied on the camera output. The script sets the camera output as the `_MainTex` of the material.
-* Aspect Stretch - apply a custom stretch to the output, allowing your assets to be displayed in non square pixels.
+* __Camera Material__ - A material applied to the camera output, allows shaders to modify the image. The camera output is set as the `_MainTex` of the material.
+* __Aspect Stretch__ - Apply a stretch to the output, allowing the display to be non square pixels.
+* __Perspective Z__ - Only for perspective cameras. The Z distance from the camera that is rendered as pixel perfect.
 
 ## Caveats ##
 
-* If a camera or sprite is out of alignment with the pixel grid, unwanted artifacts may occur
-* Pixel Camera will not automatically zoom in or out according to the window/viewport size
+* If a camera or sprite is out of alignment with the pixel grid, unwanted artifacts may occur.
+* Pixel Camera will not automatically zoom in or out according to the window/viewport size.
+* Camera `Viewport Rect` settings are not taken into account.
+* With a perspective camera, zoom levels below 1 will render a black border.
 
 ## Technical Details ##
 
-Pixel camera takes the size of the screen and finds the pixel size required to cover the entire screen at the given settings.
+Pixel camera takes the size of the screen and finds the render size required to cover the screen in a pixel perfect manner, at the given settings.
 
-The camera orthographic size is modified so that the render fits the calculated size, and the output is sent to a RenderTexture.
+A `RenderTexture` of the calculated render size is created, and if needed the camera settings are modified so the render fits the calculated size. The camera output is sent to the `RenderTexture`.
 
 A dummy camera that renders nothing is created, and the `OnPostRender()` function is used to draw the output of the attached camera onto the screen using GL commands.
 
@@ -56,11 +64,15 @@ __AspectStretch__ : Vector2
 
 An additional stretch applied to the camera, allows camera to render as non square pixels.
 
-__RenderTexture__ : RenderTexture
+__PerspectiveZ__ : float
+
+With a perspective camera, the distance from the camera that is rendered as pixel perfect.
+
+__RenderTexture__ : RenderTexture, read only
 
 Access to the RenderTexture used as the camera output.
 
-__CameraSize__ : int[]
+__CameraSize__ : int[], read only
 
 Actual pixel size of the camera, as an integer array.