Archive 17/01/2023.

Independent navigation

GodMan

Is it possible to have agents that don’t track just one point on a navigation mesh or crowd agent?

For example lets say I have 10 agents apart of a crowd navigation. Is it possible to have them track different positions instead of all of them moving to one location?

Thanks

Eugene

Target positions can be set for each agent individually.

github.com

urho3d/Urho3D/blob/master/Source/Urho3D/Navigation/CrowdAgent.h#L100


/// Handle enabled/disabled state change.
void OnSetEnabled() override;
/// Draw debug geometry.
void DrawDebugGeometry(bool depthTest);
/// Draw debug feelers.
void DrawDebugGeometry(DebugRenderer* debug, bool depthTest) override;
/// Submit a new target position request for this agent.
/// @property
void SetTargetPosition(const Vector3& position);
/// Submit a new target velocity request for this agent.
/// @property
void SetTargetVelocity(const Vector3& velocity);
/// Reset any target request for the specified agent. Note that the agent will continue to move into the current direction; set a zero target velocity to actually stop.
void ResetTarget();
/// Update the node position. When set to false, the node position should be updated by other means (e.g. using Physics) in response to the E_CROWD_AGENT_REPOSITION event.
/// @property
void SetUpdateNodePosition(bool unodepos);
/// Set the agent's max acceleration.
/// @property

GodMan

I will look this over…
Thanks @Eugene

evolgames

I’ve done this in a WIP game and can verify it works how you want it to.
The crowd can be told to go somewhere together, which is fine, but not what you want. They avoid each other great, though. So what I do is I set each individual agent’s target position using the function Eugene referenced. I think the Sample has the first agent go to the exact group destination and each other npc is a random point somewhere near (in a radius around it), however you can override that and just set all those targets to anywhere on your navmesh. I use script objects to track where they are and when they arrive at their destinations (for example with waypoints) and then set the next one.