유니티 텍스처 관련

 

SetPixel

public Texture2D texture2D;
void Start()
{
    texture2D = new Texture2D(512,1);
    for (int i = 0; i < 512; i++)
    {
        texture2D.SetPixel(i,0, new Color(1, (float)i / 512, 0, 0.25f));
    }
    texture2D.Apply();
}

 

SetPixels

public Texture2D texture2D;
void Start()
{
    var colors = new Color[512];
    for (int i = 0; i < 512; i++)
    {
        colors[i] = new Color(1, (float)i / 512, 0, 0.25f);
    }
    texture2D = new Texture2D(512, 1);
    texture2D.SetPixels(0, 0, texture2D.width, texture2D.height, colors);
    texture2D.Apply();
}

 

 

 

 

픽셀 불러오기

var pixels = tex.GetPixels(0, 0, tex.width, tex.height);
for (int x = 0; x < tex.width; x++)
{
    for (int y = 0; y < pixels.Length / tex.width; y++)
    {
        var index = y * tex.width + x;
        var pixel = pixels[index];
    }
}

 

 

 

렌더텍스처 픽셀 가져오기

원문코드는 이곳에서 가져왔다 https://docs.unity3d.com/kr/530/ScriptReference/RenderTexture-active.html

    static public Texture2D GetRTPixels(RenderTexture rt)
    {

        // Remember currently active render texture
        RenderTexture currentActiveRT = RenderTexture.active;

        // Set the supplied RenderTexture as the active one
        RenderTexture.active = rt;

        // Create a new Texture2D and read the RenderTexture image into it
        Texture2D tex = new Texture2D(rt.width, rt.height);
        tex.ReadPixels(new Rect(0, 0, tex.width, tex.height), 0, 0);

        // Restorie previously active render texture
        RenderTexture.active = currentActiveRT;
        return tex;
    }

위 코드 사용 예제

var texture = GetRTPixels(renderTexture);
var pixels = texture.GetPixels(0, 0, texture.width, texture.height, miplevel : 0);

 

 

 

Texture2D 빈 가장자리 제거

    static public Texture2D TrimTexture(Texture2D texture)
    {
        return TrimTexture(texture, Vector2.zero);
    }
    static public Texture2D TrimTexture(Texture2D texture,Vector2 padding)
    {
        var rect = new Rect(0, 0, texture.width, texture.height);

        {
            var pixels = texture.GetPixels(0, 0, texture.width, texture.height);
            //x
            for (int x = 0; x < texture.width; x++)
            {
                for (int y = 0; y < pixels.Length / texture.width; y++)
                {
                    var index = x + y * texture.width;
                    var pixel = pixels[index];
                    if (pixel.a > 0)
                    {
                        rect.x = x;
                        break;
                    }
                }
                if (rect.x != 0)
                {
                    break;
                }
            }

            //y
            for (int y = 0; y < pixels.Length / texture.width; y++)
            {
                for (int x = 0; x < texture.width; x++)
                {
                    var index = x + y * texture.width;
                    var pixel = pixels[index];
                    if (pixel.a > 0)
                    {
                        rect.y = y;
                        break;
                    }
                }
                if (rect.y != 0)
                {
                    break;
                }
            }

            //width
            for (int x = texture.width - 1; x >= 0; x--)
            {
                for (int y = pixels.Length / texture.width - 1; y >= 0; y--)
                {
                    var index = x + y * texture.width;
                    var pixel = pixels[index];
                    if (pixel.a > 0)
                    {
                        rect.width = x - rect.x;
                        break;
                    }
                }
                if (rect.width != texture.width)
                {
                    break;
                }
            }

            //height
            for (int y = pixels.Length / texture.width - 1; y >= 0; y--)
            {
                for (int x = texture.width - 1; x >= 0; x--)
                {
                    var index = x + y * texture.width;
                    var pixel = pixels[index];
                    if (pixel.a > 0)
                    {
                        rect.height = y - rect.y;
                        break;
                    }
                }
                if (rect.height != texture.height)
                {
                    break;
                }
            }
        }
        {
            var pixels = texture.GetPixels((int)rect.x, (int)rect.y, (int)rect.width, (int)rect.height);
            var trimTexture = new Texture2D((int)rect.width+ (int)padding.x*2, (int)rect.height + (int)padding.y * 2);
            var defaultPixels = new Color[trimTexture.width * trimTexture.height];
            System.Array.ConvertAll(defaultPixels,x=>new Color(0,0,0,0));
            trimTexture.SetPixels(0, 0, trimTexture.width, trimTexture.height, defaultPixels);
            trimTexture.SetPixels((int)padding.x, (int)padding.y, (int)rect.width, (int)rect.height, pixels);
            trimTexture.Apply();
            return trimTexture;
        }
    }

 

 

 

RGB만 바꾸기

만들고 보니 쓸모가 없어졌네

    /// <summary>
    /// rgb만 바꾸고 a는 그냥 놔둠
    /// </summary>
    /// <param name="texture"></param>
    /// <param name="color"></param>
    static public void ChangeRGB(Texture2D texture,Color color)
    {
        var pixels = texture.GetPixels(0, 0, texture.width, texture.height);
        for (int x = 0; x < texture.width; x++)
        {
            for (int y = 0; y < pixels.Length / texture.width; y++)
            {
                var index = x + y * texture.width;
                pixels[index].r = color.r;
                pixels[index].g = color.g;
                pixels[index].b = color.b;
            }
        }
        texture.SetPixels(0, 0, texture.width, texture.height, pixels);
    }

 

 

 

 

 

 

SaveRenderWindow

https://gist.github.com/ahzkwid/10974a8f59c215ea02a9e5a35e533f66

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

#if UNITY_EDITOR
//https://gist.github.com/ahzkwid/10974a8f59c215ea02a9e5a35e533f66

using UnityEditor;

[InitializeOnLoad]
class SaveRenderWindow : EditorWindow
{
    public RenderTexture targetRenderTexture;

    [UnityEditor.MenuItem("Ahzkwid/" + nameof(SaveRenderWindow))]
    public static void Init()
    {
        GetWindow<SaveRenderWindow>(false, nameof(SaveRenderWindow));
    }
    SerializedObject serializedObject;
    void OnGUI()
    {
        if (serializedObject == null)
        {
            serializedObject = new SerializedObject(this);
        }
        serializedObject.Update();
        {
            EditorGUILayout.Space();
            EditorGUILayout.PropertyField(serializedObject.FindProperty(nameof(targetRenderTexture)));
        }
        serializedObject.ApplyModifiedProperties();
        if (GUILayout.Button("Save"))
        {
            SaveRenderTexture();
        }
    }
    static public Texture2D GetRTPixels(RenderTexture rt)
    {
        //https://docs.unity3d.com/kr/530/ScriptReference/RenderTexture-active.html
        RenderTexture currentActiveRT = RenderTexture.active;
        RenderTexture.active = rt;

        Texture2D tex = new Texture2D(rt.width, rt.height);
        tex.ReadPixels(new Rect(0, 0, tex.width, tex.height), 0, 0);
        RenderTexture.active = currentActiveRT;
        return tex;
    }
    public void SaveRenderTexture()
    {
        if (targetRenderTexture != null)
        {
            var fileName = $"{System.DateTime.Now.Ticks}";
            var folderPath = $"{Application.persistentDataPath}";
            var filePath = $"{folderPath}/{fileName}.png";

            if (System.IO.Directory.Exists(folderPath) == false)
            {
                System.IO.Directory.CreateDirectory(folderPath);
            }
            var texture2D = GetRTPixels(targetRenderTexture);
            //var texture2D = new Texture2D(targetRenderTexture.width, targetRenderTexture.height, TextureFormat.RGBA32, false);
            //texture2D.SetPixels(targetRenderTexture.GetPixels());
            var bytes = texture2D.EncodeToPNG();
            System.IO.File.WriteAllBytes(filePath, bytes);

            System.Diagnostics.Process.Start(folderPath);
        }
    }
}
#endif