Question How to programmatically change opacity on URP decal projector?

The documentation for the URP projector is below.
Class DecalProjector | Universal RP | 12.1.10 (unity3d.com)

It says the variable fadeFactor controls the opacity, but I can't seem to access this variable programmatically.

Code (CSharp):

1. public DecalProjector decalProjector;
2.  
3. private void OnTriggerEnter(Collider other)
4. {
5.     //unrelated code
6.     decalProjector.fadeFactor = 1; // ----> returns error (Decal projector does not contain a definition for fadeFactor)
7. }

 

You can programmatically change the opacity of a URP (Universal Render Pipeline) decal projector by accessing its material and modifying the alpha value of its color property.

Here's an example code snippet in C# that demonstrates how to set the opacity of a decal projector to a specified value:

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.Rendering.Universal;
3.  
4. public class DecalOpacityChanger : MonoBehaviour
5. {
6.     public float opacity = 0.5f; // the desired opacity value between 0 and 1
7.  
8.     private DecalProjector decalProjector;
9.     private Material decalMaterial;
10.  
11.     void Start()
12.     {
13.         decalProjector = GetComponent<DecalProjector>();
14.         decalMaterial = decalProjector.material;
15.     }
16.  
17.     void Update()
18.     {
19.         Color decalColor = decalMaterial.color;
20.         decalColor.a = opacity;
21.         decalMaterial.color = decalColor;
22.     }
23. }
24.  

 

This is still giving me an error. It says DecalProjector does not contain a definition for material.

 

It turns out whatever DecalProjector I was using wasn't the one in the Universal Rendering Pipeline. When I specified

Code (CSharp):

1. UnityEngine.Rendering.Universal.DecalProjector

it worked as it should.