Texture2D.GetPixelBilinear

参数

返回值

Color 像素颜色。

描述

获取归一化坐标 (u, v) 处的滤波像素颜色。

此方法从 CPU 内存中的纹理获取像素数据。 Texture.isReadable 必须为 true。

Unity 使用双线性滤波来返回像素颜色。

左下角为 (0, 0)。如果像素坐标超出纹理的尺寸，Unity 会根据纹理的 TextureWrapMode 对其进行钳位或重复。

您不能将 GetPixelBilinear 用于使用 Crunch 纹理压缩的纹理。请改用 GetPixels32。

其他资源：GetPixel。

using UnityEngine;

public class Example : MonoBehaviour
{
    // "Warp" a texture by squashing its pixels to one side.
    // This involves sampling the image at non-integer pixel
    // positions to ensure a smooth effect.

    // Source image.
    public Texture2D sourceTex;

    // Amount of "warping".
    public float warpFactor = 1.0f;

    Texture2D destTex;
    Color[] destPix;


    void Start()
    {
        // Set up a new texture with the same dimensions as the original.
        destTex = new Texture2D(sourceTex.width, sourceTex.height);
        destPix = new Color[destTex.width * destTex.height];

        // For each pixel in the destination texture...
        for (var y = 0; y < destTex.height; y++)
        {
            for (var x = 0; x < destTex.width; x++)
            {
                // Calculate the fraction of the way across the image
                // that this pixel positon corresponds to.
                float xFrac = x * 1.0f / (destTex.width - 1);
                float yFrac = y * 1.0f / (destTex.height - 1);

                // Take the fractions (0..1)and raise them to a power to apply
                // the distortion.
                float warpXFrac = Mathf.Pow(xFrac, warpFactor);
                float warpYFrac = Mathf.Pow(yFrac, warpFactor);

                // Get the non-integer pixel positions using GetPixelBilinear.
                destPix[y * destTex.width + x] = sourceTex.GetPixelBilinear(warpXFrac, warpYFrac);
            }
        }

        // Copy the pixel data to the destination texture and apply the change.
        destTex.SetPixels(destPix);
        destTex.Apply();

        // Set our object's texture to the newly warped image.
        GetComponent<Renderer>().material.mainTexture = destTex;
    }
}

其他资源：GetPixel。