Based on the error message you provided, it appears that the GameGui class, which contains the WorldToScreen method, is not being accessed correctly in your code. The error message "An object reference is required for the non-static field, method, or property" typically occurs when you are trying to access a non-static member of a class without an instance of that class.

To resolve this compilation error, you can try the following solutions:

Create an instance of the GameGui class before calling the WorldToScreen method:
```csharp
internal void Point(Vector3 worldPos) {
     var gameGui = new GameGui(); // Create an instance of GameGui
     var viz = gameGui.WorldToScreen(worldPos, out Vector2 screenPos);

     DrawList.PathLineTo(screenPos);
     if (viz) {
          cullObj = false;
     }
}
```
Note that this solution assumes that the GameGui class has a parameterless constructor, or that you provide the necessary arguments if it requires constructor parameters.

If GameGui is intended to be a singleton or has a shared instance that you need to access, you can use that instance instead of creating a new instance:
```csharp
internal void Point(Vector3 worldPos) {
     var gameGui = GameGui.Instance; // Get the shared instance of GameGui
     var viz = gameGui.WorldToScreen(worldPos, out Vector2 screenPos);

     DrawList.PathLineTo(screenPos);
     if (viz) {
          cullObj = false;
     }
}
```
Note that GameGui.Instance is just a placeholder for the actual way to access the shared instance of GameGui in your code. It may vary depending on how the GameGui class is designed.

If WorldToScreen is intended to be a static method of the GameGui class, you can call it directly without creating an instance:
```csharp
internal void Point(Vector3 worldPos) {
     var viz = GameGui.WorldToScreen(worldPos, out Vector2 screenPos);

     DrawList.PathLineTo(screenPos);
     if (viz) {
          cullObj = false;
     }
}
```
Make sure that the WorldToScreen method is declared as static in the GameGui class if you intend to call it in this manner.

To learn more about accessing class members in C#, you can refer to the Microsoft documentation on classes and objects in C#.
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