unity改变材质参数

这里在做的是一个player受伤闪烁的效果，用的是standard shader的自发光参数；

首先确定需要的变量：

[Header("Hurt Flash---")]
    public float hurtFlashSpeed = 1f;
    public float emissionFloor = 0.3f;
    public float emissionCeil = 1f;
    public float hurtMaxDuration = 1f;
    private float timeSinceLastHurt;
    private bool isInHurtState;

然后在OnEnable中获取材质，以及初始化：

// hurt flash 
        isInHurtState = false;
        timeSinceLastHurt = 0;
        playerMat = GetComponent<Renderer>().material;
        playerMat.EnableKeyword("_EMISSION");
        playerMat.SetColor("_EmissionColor", Color.clear);

之后在update中，进行闪烁：

// hurt flash --------------------------------------------- hurt flash effect
            if (isInHurtState)
            {
                timeSinceLastHurt += Time.deltaTime;
                if (timeSinceLastHurt > hurtMaxDuration)
                {
                    Debug.Log("Recover!");
                    timeSinceLastHurt = 0;
                    isInHurtState = false;
                    // set to normal state
                    //playerMat.EnableKeyword("_EMISSION");
                    playerMat.SetColor("_EmissionColor", Color.clear);
                    return;
                }
                float emission = emissionFloor + Mathf.PingPong(Time.time * hurtFlashSpeed, emissionCeil - emissionFloor);
                Color baseColor = Color.yellow;
                Color finalColor = baseColor * Mathf.LinearToGammaSpace(emission);  // better transition for human eyes
                //playerMat.EnableKeyword("_EMISSION");
                playerMat.SetColor("_EmissionColor", finalColor);
            }

注意：Mathf.LinearToGammaSpace更符合人眼观察的过度；

参考链接：

https://answers.unity.com/questions/914923/standard-shader-emission-control-via-script.html

https://docs.unity3d.com/Manual/MaterialsAccessingViaScript.html