Texture2D.GetPixel

参数

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Color The pixel color.

描述

Gets the pixel color at coordinates (x, y).

This method gets pixel data from the texture in CPU memory. Texture.isReadable must be true.

The lower left corner is (0, 0). If the pixel coordinate is outside the texture's dimensions, Unity clamps or repeats it, depending on the texture's TextureWrapMode.

GetPixel might be slower than some other texture methods because it converts the format the texture uses into Color. GetPixel also needs to decompress compressed textures, and use memory to store the decompressed area. To get pixel data more quickly, use GetPixelData instead.

If you need to get a large block of pixels, it might be faster to use GetPixels32 or GetPixels.

You can't use GetPixel with textures that use Crunch texture compression.

另请参阅：GetPixels32、GetPixels、SetPixel、GetPixelBilinear。

// Sets the y coordinate of the transform to follow a heightmap

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public Texture2D heightmap;
    public Vector3 size = new Vector3(100, 10, 100);

    void Update()
    {
        int x = Mathf.FloorToInt(transform.position.x / size.x * heightmap.width);
        int z = Mathf.FloorToInt(transform.position.z / size.z * heightmap.height);
        Vector3 pos = transform.position;
        pos.y = heightmap.GetPixel(x, z).grayscale * size.y;
        transform.position = pos;
    }
}