unity - Rapid transparent Screenshot maker for prefabs and other objects

unity

// How to use 
// Create a new .cs file in the Unity with AssetPreviewScreenshot name 
// Create a new folder and name it to Editor place the AssetPreviewScreenshot.cs file here!
// When done, navigate the Tools > Preview Screenshort - menu name and open it
// select your prefab material etc.. Click the Take a screenshot button
// In the preview you will see Unity in its original colour. But in the saved state it will be transparent. 
// If you want to use a different color in Unity, you have to rewrite the original values in the code: #525252 (RGB value: 82, 82, 82)

// Why is colour important? Because the code explclit transforms the given colour code.
// When you look at a 3D model or material in inspector you can see what the default background color is in Unity, 
// if it is a different color than the default color in the code, you have to rewrite it, otherwise the images will not be transparent.

// rewite it in the Line 79

using UnityEngine;
using UnityEditor;
using System.IO;
using System.Diagnostics;

public class PreviewScreenshot : EditorWindow
{
    private Object selectedObject;
    private Object lastSelectedObject;
    private Texture2D previewTexture;
    private string lastSavedPath;
    private bool isLoadingPreview = false;

    [MenuItem("Tools/Preview Screenshot")]
    public static void ShowWindow()
    {
        GetWindow<PreviewScreenshot>("Preview Screenshot");
    }

    void OnGUI()
    {
        GUILayout.BeginVertical();

        selectedObject = EditorGUILayout.ObjectField("Select Object", selectedObject, typeof(Object), false);

        if (selectedObject != lastSelectedObject)
        {
            isLoadingPreview = true;
            previewTexture = null;
            lastSelectedObject = selectedObject;
        }

        if (isLoadingPreview && selectedObject != null)
        {
            previewTexture = AssetPreview.GetAssetPreview(selectedObject);
            if (previewTexture != null)
            {
                isLoadingPreview = false;
            }
        }

        if (previewTexture != null)
        {
            GUILayout.Label("Preview:");
            GUILayout.Label(previewTexture, GUILayout.Width(256), GUILayout.Height(256));
        }
        else if (selectedObject != null && isLoadingPreview)
        {
            GUILayout.Label("Loading preview...");
            Repaint(); // Folyamatosan frissíti az ablakot, amíg a preview betölt
        }

        if (GUILayout.Button("Take Screenshot"))
        {
            if (selectedObject != null && previewTexture != null)
            {
                SavePreviewScreenshot(selectedObject);
            }
            else
            {
                UnityEngine.Debug.LogWarning("No object selected or preview not available!");
            }
        }

        if (!string.IsNullOrEmpty(lastSavedPath) && GUILayout.Button("Open Folder"))
        {
            OpenFolder(lastSavedPath);
        }

        GUILayout.EndVertical();
    }

    private void SavePreviewScreenshot(Object obj)
    {
        if (previewTexture != null)
        {
            SaveTextureAsPNGWithTransparency(previewTexture, obj.name);
        }
        else
        {
            UnityEngine.Debug.LogWarning("No preview available to save.");
        }
    }

    private void SaveTextureAsPNGWithTransparency(Texture2D texture, string fileName)
    {
        Texture2D transparentTexture = new Texture2D(texture.width, texture.height, TextureFormat.RGBA32, false);
        Color[] pixels = texture.GetPixels();
        for (int i = 0; i < pixels.Length; i++)
        {
            if (Mathf.Approximately(pixels[i].r, 82 / 255f) && Mathf.Approximately(pixels[i].g, 82 / 255f) && Mathf.Approximately(pixels[i].b, 82 / 255f))
            {
                pixels[i] = new Color(0, 0, 0, 0);
            }
        }
        transparentTexture.SetPixels(pixels);
        transparentTexture.Apply();

        byte[] bytes = transparentTexture.EncodeToPNG();
        string path = EditorUtility.SaveFilePanel("Save Screenshot", "", fileName + "_transparent.png", "png");

        if (!string.IsNullOrEmpty(path))
        {
            File.WriteAllBytes(path, bytes);
            lastSavedPath = path;
            UnityEngine.Debug.Log("Screenshot saved to: " + path);
        }
    }

    private void OpenFolder(string filePath)
    {
        string folderPath = Path.GetDirectoryName(filePath);
        if (!string.IsNullOrEmpty(folderPath))
        {
            Process.Start("explorer.exe", folderPath.Replace("/", "\\"));
            UnityEngine.Debug.Log("Opened folder: " + folderPath);
        }
    }
}

fixed the layoutgroup error