Texture.width

public int width ;

説明

ピクセル単位でのテクスチャの幅（読み取り専用）

using UnityEngine;

public class Example : MonoBehaviour
{
    // Print texture size to the Console
    Texture texture;
    void Start()
    {
        print("Size is " + texture.width + " by " + texture.height);
    }
}