Texture2D.GetPixelBilinear

Description

返回标准化坐标 (u, v) 处已过滤的像素颜色。

坐标 u 和 v 的取值范围为 0.0 到 1.0，与网格中的 UV 坐标类似。 如果坐标超出边界（大于 1.0 或小于 0.0）， 则将被限制或者将根据该纹理的包裹模式进行重复。

纹理坐标从左下角开始。UV (0,0) 正好落在左下角的纹理像素上； UV ((width-1)/width, (height-1)/height) 正好 落在右上角的纹理像素上。

返回的像素颜色经过双线性过滤。

The texture must have the read/write enabled flag set in the texture import settings, otherwise this function will fail. GetPixelBilinear is not available on Textures using Crunch texture compression.

另请参阅：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;
    }
}

另请参阅：GetPixel。