Problem in updating shader properties from script

Questions & Answers
1

I have a float property in my shader which I want to change its value from my script.

My shader

Properties {
	_Opacity ("Opacity", Range(0.0,1.0)) = 1.0
	_MainTex ("Texture to blend", 2D) = "black" {}
}

My script

    protected void Update ()
    {
        float opacity = 0.2f;

        Debug.Log(string.Format("BEFORE: {0}", this.renderer.material.GetFloat("_Opacity")));

        this.renderer.material.SetFloat("_Opacity", opacity);

        Debug.Log(string.Format("AFTER: {0}", this.renderer.material.GetFloat("_Opacity")));
    }

The problem is this float variable got reset to value 1.0f every frame entering Update().

Any help or clue would be gratefully received!

Thanks.

2

I’m not sure and not tested but you can try this;

void Update ()
     {
         float opacity = 0.2f;
 
         Debug.Log(string.Format("BEFORE: {0}", this.renderer.material.GetFloat("_Opacity")));
 
         renderer.material.SetFloat("_Opacity", opacity);
 
         Debug.Log(string.Format("AFTER: {0}", this.renderer.material.GetFloat("_Opacity")));
     }