性能消耗以秒计…不实用。

private Texture2D GenerateProceduralTexture()
{
    Texture2D pTex = new Texture2D(textureWidth, textureWidth);
    float circleInterval = textureWidth / 4.0f;
    float radius = textureWidth / 10.0f;
    float edgeBlur = 1.0f / blurFactor;

    for(int w = 0; w < textureWidth; w++)
    {
        for(int h = 0; h < textureWidth; h++)
        {
            Color pixel = backgroundColor;
            for (int i = 0; i < 3; i++)
            {
                for(int j = 0; j < 3; j++)
                {
                    Vector2 circleCenter = new Vector2(circleInterval * (i + 1), circleInterval * (j + 1));
                    float dist = Vector2.Distance(new Vector2(w, h), circleCenter) - radius;
                    Color color = MixColor(circleColor, new Color(pixel.r, pixel.g, pixel.b, 0.0f), Mathf.SmoothStep(0f, 1.0f, dist * edgeBlur));
                    pixel = MixColor(pixel, color, color.a);
                }
            }
            pTex.SetPixel(w, h, pixel);
        }
    }
    pTex.Apply();
    return pTex;
}

private Color MixColor(Color color0, Color color1, float mixFactor)
{
    Color mixColor = Color.white;
    mixColor.r = Mathf.Lerp(color0.r, color1.r, mixFactor);
    mixColor.g = Mathf.Lerp(color0.g, color1.g, mixFactor);
    mixColor.b = Mathf.Lerp(color0.b, color1.b, mixFactor);
    mixColor.a = Mathf.Lerp(color0.a, color1.a, mixFactor);
    return mixColor;
}

性能消耗以秒计…不实用。