unity使用perlin噪声并保存为PNG图片

unity使用perlin噪声并保存为PNG图片。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;

public class perlinTest : MonoBehaviour {
    // Width and height of the texture in pixels.
    public int pixWidth;
    public int pixHeight;

    // The origin of the sampled area in the plane.
    public float xOrg;
    public float yOrg;

    // The number of cycles of the basic noise pattern that are repeated
    // over the width and height of the texture.
    public float scale = 1.0F;

    private Texture2D noiseTex;
    private Color[] pix;
    private Renderer rend;

    void Start()
    {
        rend = GetComponent();

        // Set up the texture and a Color array to hold pixels during processing.
        noiseTex = new Texture2D(pixWidth, pixHeight);
        pix = new Color[noiseTex.width * noiseTex.height];
        rend.material.mainTexture = noiseTex;
    }

    void CalcNoise()
    {
        // For each pixel in the texture...
        float y = 0.0F;

        while (y < noiseTex.height)
        {
            float x = 0.0F;
            while (x < noiseTex.width)
            {
                float xCoord = xOrg + x / noiseTex.width * scale;
                float yCoord = yOrg + y / noiseTex.height * scale;
                float sample = Mathf.PerlinNoise(xCoord, yCoord);
                pix[(int)y * noiseTex.width + (int)x] = new Color(sample, sample, sample);
                x++;
            }
            y++;
        }

        // Copy the pixel data to the texture and load it into the GPU.
        noiseTex.SetPixels(pix);
        noiseTex.Apply();
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space))
        {
            CalcNoise();
            
            SaveRenderTextureToPNG(noiseTex, GetComponent().material.shader,"D:\\name", "ok");
        }
    }


    public bool SaveRenderTextureToPNG(Texture2D inputTex, Shader outputShader, string contents, string pngName)
    {
        RenderTexture temp = RenderTexture.GetTemporary(inputTex.width, inputTex.height, 0, RenderTextureFormat.ARGB32);
        //Material mat = new Material(outputShader);
        Graphics.Blit(inputTex, temp);
        bool ret = SaveRenderTextureToPNG(temp, contents, pngName);
        RenderTexture.ReleaseTemporary(temp);
        return ret;

    }


    public bool SaveRenderTextureToPNG(RenderTexture rt, string contents, string pngName)
    {
        RenderTexture prev = RenderTexture.active;
        RenderTexture.active = rt;
        Texture2D png = new Texture2D(rt.width, rt.height, TextureFormat.ARGB32, false);
        png.ReadPixels(new Rect(0, 0, rt.width, rt.height), 0, 0);
        byte[] bytes = png.EncodeToPNG();
        if (!Directory.Exists(contents))
            Directory.CreateDirectory(contents);
        FileStream file = File.Open(contents + "/" + pngName + ".png", FileMode.Create);
        BinaryWriter writer = new BinaryWriter(file);
        writer.Write(bytes);
        file.Close();
        Texture2D.DestroyImmediate(png);
        png = null;
        RenderTexture.active = prev;
        Debug.Log("12345");
        return true;
    }
}

代码凑出来的，分为两个阶段，第一个阶段生成perlin噪声，第二个阶段将texture2D转为PNG并保存。

脚本放在一个物体上，能看见。