Unity GameView Camera Render To PNG (editor-only)

GameViewRender.cs

#if UNITY_EDITOR
using UnityEngine;
using UnityEditor;

[RequireComponent( typeof(Camera) )]
public class GameViewRender : MonoBehaviour {
    public int width = 1920;
    public int height = 1080;
    public int depth = 24;

    public void Render() {
        // create a rendertexture with the given dimentions
        var rt = new RenderTexture( width, height, depth );
        // set the rendertexture as the target texture for the camera
        var camera = GetComponent<Camera>();
        camera.targetTexture = rt;
        camera.Render();
        // open save file dialogue and get path
        var path = EditorUtility.SaveFilePanel( "Save Rendered Image", "", "rendered", "png" );
        // read the pixels from the rendertexture
        var pixels = new Texture2D( width, height );
        RenderTexture.active = rt;
        pixels.ReadPixels( new Rect( 0, 0, width, height ), 0, 0 );
        pixels.Apply();
        // write the pixels to the file
        var bytes = pixels.EncodeToPNG();
        System.IO.File.WriteAllBytes( path, bytes );
        // clean up
        RenderTexture.active = null;
        camera.targetTexture = null;
        DestroyImmediate( rt );

        Debug.Log( "Rendered image saved to " + path );
    }

    [CustomEditor( typeof(GameViewRender) )]
    class editor : Editor {
        public override void OnInspectorGUI() {
            serializedObject.Update();
            EditorGUILayout.PropertyField( serializedObject.FindProperty( nameof(width) ) );
            EditorGUILayout.PropertyField( serializedObject.FindProperty( nameof(height) ) );
            EditorGUILayout.PropertyField( serializedObject.FindProperty( nameof(depth) ) );
            if (GUILayout.Button( "Render", GUILayout.Height( 30 ) )) {
                ( (GameViewRender)target ).Render();
            }

            serializedObject.ApplyModifiedProperties();
        }
    }
#endif
}