画像を分割して個別に保存する

ImageSlicer.cs

using UnityEngine;
using System.IO;

public class ImageSlicer : MonoBehaviour {
	[SerializeField]
	Texture2D texture;

	[SerializeField]
	int horizontalSlices;

	[SerializeField]
	int verticalSlices;

	[SerializeField]
	string saveDirectoryPath = "slicedImages/";

	int partWidth;
	int partHeight;

	void Start () {
		// 保存先ディレクトリが存在しなければ作成
		if (!Directory.Exists(saveDirectoryPath))
			Directory.CreateDirectory(saveDirectoryPath);

		SliceImage();
	}

	void SliceImage() {
		partWidth = texture.width / horizontalSlices;
		partHeight = texture.height / verticalSlices;
		var fileNameIndex = 0;

		for (var partY = verticalSlices; partY > 0; partY--) {
			for (var partX = 0; partX < horizontalSlices; partX++) {
				// 分割した一枚分のピクセルたちを取得
				var partPixels = ReadPartPixels(partX, partY, texture);

				// 新しいテクスチャに書き込む
				var partTexture = new Texture2D (partWidth, partHeight, TextureFormat.RGBA32, false);
				partTexture.SetPixels (partPixels);
				partTexture.Apply ();

				// テクスチャをpngにしてローカルに保存
				SaveBinaryToLocal (partTexture.EncodeToPNG(), fileNameIndex + ".png");
				fileNameIndex++;
			}
		}
	}

	Color[] ReadPartPixels(int partX, int partY, Texture2D texture) {
		var pixels = new Color[partWidth * partHeight];
		var offsetX = partX * partWidth;
		var offsetY = partY * partHeight;

		for (int y = offsetY, y_ = partHeight - 1; y > offsetY - partHeight; y--, y_--) {
			for (int x = offsetX, x_ = 0; x < offsetX + partWidth; x++, x_++) {
				pixels[y_ * partWidth + x_] = texture.GetPixel(x, y);
			}
		}

		return pixels;
	}

	void SaveBinaryToLocal(byte[] binaryData, string fileName) {
		var fileStream = new FileStream (saveDirectoryPath + fileName, FileMode.Create, FileAccess.Write);
		var binaryWriter = new BinaryWriter (fileStream);

		binaryWriter.Write(binaryData);

		binaryWriter.Close();
		fileStream.Close();
	}
}