Texture2D.GetPixel

Description

Returns pixel color at coordinates (x, y).

If the pixel coordinates are out of bounds (larger than width/height or smaller than 0), they will be clamped or repeated based on the texture's wrap mode.

Texture coordinates start at lower left corner.

If you are reading a large block of pixels from the texture, it may be faster to use GetPixels32 or GetPixels which returns a whole block of pixel colors.

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

See Also: GetPixels32, GetPixels, SetPixel, GetPixelBilinear.

// Sets the y coordinate of the transform to follow the 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;
    }
}