Can't Change Gameobject Color via Script

Can't change GameObject color via script?

Here is your problem:

new Color(0f, 0f, 0f, **255f**);

The Color constructor parameter takes values from 0f to 1f but you are passing 0f to 255f range value to it.

That should be:

colorToFadeTo = new Color(0f, 0f, 0f, 1f);

If you want to use the 0 to 255 range then you must divide it by 255.

colorToFadeTo = new Color(0f, 0f, 0f, 255f/255f);

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Also, there is Color32 which can take values between 0 and 255. You can use that then covert it back to color.

Color32 color32 = new Color32(0f, 0f, 0f, 255f));
Color color = color32;

Can't change color of the material, Unity

Are you sure the method is being called? OnCollisionEnter is triggered when this collider/rigidbody has started contact with another rigidbody/collider.

Check that there is a collider/rigidbody on the object that the sphere collides with and on the sphere itself

Also, try using Debug.Log() to make sure that the code is triggered.

I checked your line in the Start() method, it works. The problem is something else

Change prefab color from script

You must change the start color of the ParticleSystem, not the material of an nonexistent MeshRenderer.

   newSmoke.GetComponent<ParticleSystem>().startColor = Color.red ;

https://docs.unity3d.com/ScriptReference/ParticleSystem-startColor.html

Change Color of just one instantiated object in Unity

Make sure you are refencing the instantiated Object instead of the prefab.

This should work for you:

GameObject instance = Instantiate(prefab);

instance.GetComponent<Renderer>().material.color =
                new Color(Random.Range(0f, 1f), Random.Range(0f, 1f), Random.Range(0f, 1f),1f);

When changing the colour of a prefab using a c#script, it shows in the inspector but not in the game view

Finally found it after days of searching!
Thanks to https://stackoverflow.com/a/54008057/11829883

Because the arrows body was a child of the arrow model which was a child of the actual arrow prefab, I had to call GetChild(0) twice on the object - for some reason GetComponentInChildren wasn't working so i assumed that wasn't the issue

This is the line of code that fixed it:

new_c.transform.GetChild(0).GetChild(0).GetComponent<MeshRenderer>().material.color = Color.yellow;

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