Still fairly new to Unity and presumably missing something obvious here, but ref this navmesh:
In a nutshell, I’ve a terrain with a lowered section for a river, and a bridge prefab that’s broken up in to object groups. The parts of the prefab that make the walls and parapets I’ve set to not walkable in the navmesh, and the part that joins both sides of the river I’ve set to walkable. As you can see in the screenshot, the navmesh itself seems to have baked fine with this.
The terrain and this same prefab element, i.e. the part highlighted with an orange outline, are both on a layer I’ve named AcceptMovementClicks, and I then have a movement script which on click events is supposed to raycast to objects on this layer. My thinking being that clicking for example the wall of a building should continue to cast through that wall and hit the floor inside, to then move the player to inside the building. Or in this case, clicking on top of the bridge, should move the player to on top of the bridge even if the camera is rotated in a way where you’re clicking through the parapet. Hence having the walkable areas on a specific layer and casting to that layer only:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
public class MovementController : MonoBehaviour
{
private NavMeshAgent agent;
private bool triggerMovement = false;
private Vector2 mouseDownPosition;
private Vector2 mouseUpPosition;
private int layerMask;
// Start is called before the first frame update
void Start()
{
agent = GetComponent<NavMeshAgent>();
// Layer 3 is our AcceptMovementClicks layer, where terrain and floors etc are. Physics.Raycast uses bitmasks though so we need to bitshift the layer number to get to the right part of the mask
layerMask = 1 << LayerMask.NameToLayer("AcceptMovementClicks");
}
// Update is called once per frame
void Update()
{
if(Input.GetMouseButtonDown(0) && !triggerMovement) {
triggerMovement = true;
mouseDownPosition = Input.mousePosition;
} else if(Input.GetMouseButtonUp(0) && triggerMovement) {
triggerMovement = false;
mouseUpPosition = Input.mousePosition;
if(Vector2.Distance(mouseUpPosition, mouseDownPosition) < 10) {
// Movement is small enough that we can assume the player wasn't trying to drag
RaycastHit hit;
if(Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 1000, layerMask)) {
agent.destination = hit.point;
}
}
}
}
}
What seems to be happening though, is that the movement is always trying to set the destination to a place on the terrain. The bridge is used to get there, as per the navmesh blueprint, but clicking on top of the bridge never lands the player at that location. As though the bridge is being ignored completely despite being on the correct layer, and the ray is casting to the terrain below it.
Any thoughts please?
