Enable/Disable Canvas or Image

[Mad_MarkParticipant]

Greetings,

I have a BT that is working on an NPC to detect a zombie, and when seen, the NPC entity flees to a random location.
I have a canvas over the NPC’s head holding an image of “!” that I would like to enable when the zombie is seen, and disable when out of range. Any idea how I might do that? Does that have to be done in a Custom Action? <how?>

Mark

[SigilKeymaster]

Custom action would be best, something like this:

using RAIN.Action;
using RAIN.Representation;
using UnityEngine;
[RAINAction]
public class SetCanvasVisibility : RAINAction
{
    public Expression Target = new Expression();
    public Expression Value = new Expression();
    public override ActionResult Execute(RAIN.Core.AI ai)
    {
        if (!Target.IsValid || !Value.IsValid)
            return ActionResult.FAILURE;
        GameObject tTarget = ai.WorkingMemory.GetItem<GameObject>(Target.VariableName);
        if (tTarget == null)
            return ActionResult.FAILURE;
        Canvas tCanvas = tTarget.GetComponentInChildren<Canvas>();
        tCanvas.enabled = Value.Evaluate<bool>(ai.DeltaTime, ai.WorkingMemory);
        return ActionResult.SUCCESS;
    }
}

If you want something a little less jarring, I would add a Canvas Group to the Canvas, and fade the alpha on that. I’d probably create a small component with FadeIn/FadeOut functions to handle the actual fading on the Canvas Group, and just look for that on the target instead of the Canvas itself.

[Mad_MarkParticipant]

Thanks again Sigil. Works like a charm.

RAIN is slowly starting to make sense to me, or I am finally making sense of RAIN. I think I set my sights too high at the start, and tried to make it do to much at once. Gets a tad confusing. I have managed to pull together about a dozen simple little behaviors, and am starting to integrating them into a more “complete” AI…

So, what are the best practices that I should be aware of as I progress. Do folks build one big-butt behavior tree, or implement multiple AI elements on a single object? Is that even do-able? Is there a use case?

Cheers,
Mark

[Author]

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