Texture2D.GetPixelBilinear

Параметры

Описание

Returns filtered pixel color at normalized coordinates (u, v).

Coordinates u and v go from 0.0 to 1.0, just like UV coordinates in meshes. Если координаты пикселя вышли за границы (больше чем ширина/высота или меньше 0), они будут зажаты или преобразован в соответствии с wrap mode текстуры.

Texture coordinates start at lower left corner. UV of (0,0) lands exactly on the bottom left texel; and UV of ((width-1)/width, (height-1)/height) lands exactly on the top right texel.

Returned pixel color is bilinearly filtered.

The texture must have the Read/Write Enabled flag set in the import settings, otherwise this function will fail.

See Also: GetPixel.

// "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.
var sourceTex: Texture2D;

// Amount of "warping".
var warpFactor = 1.0;

private var destTex: Texture2D;
private var destPix: Color[];


function 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.
			var xFrac = x * 1.0 / (destTex.width - 1);
			var yFrac = y * 1.0 / (destTex.height - 1);

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

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Texture2D sourceTex;
    public float warpFactor = 1.0F;
    private Texture2D destTex;
    private Color[] destPix;
    void Start() {
        destTex = new Texture2D(sourceTex.width, sourceTex.height);
        destPix = new Color[destTex.width * destTex.height];
        int y = 0;
        while (y < destTex.height) {
            int x = 0;
            while (x < destTex.width) {
                float xFrac = x * 1.0F / (destTex.width - 1);
                float yFrac = y * 1.0F / (destTex.height - 1);
                float warpXFrac = Mathf.Pow(xFrac, warpFactor);
                float warpYFrac = Mathf.Pow(yFrac, warpFactor);
                destPix[y * destTex.width + x] = sourceTex.GetPixelBilinear(warpXFrac, warpYFrac);
                x++;
            }
            y++;
        }
        destTex.SetPixels(destPix);
        destTex.Apply();
        GetComponent<Renderer>().material.mainTexture = destTex;
    }
}

See Also: GetPixel.