NavMesh wont work correct if player starts not with pos 0,0,0

[Andy90]

Hey, i have another bug. Right now the nav mesh works fine when the player starts with postion 0,0,0. But when i move the player to another postion it wont work anymore. 

https://streamable.com/x7r6id

You can check it within my project from the old bug report. Just move the player to another position and start the game.

[Josh]

Thank you for reporting this. I am investigating...

[Josh]

There are five maps in your project. Which one should I be testing?

 

[Andy90]

I think test2 fits the best.

[Josh]

I am getting a strange result. If I move the player start position in the editor, he always starts back at the zero position.

test2_poschanged.zip

[Josh]

This is why:

/// <summary>
/// Setup the Controller
/// </summary>
void MouseMovementController::Start() {
    auto entity = GetEntity();
    entity->AddTag("player");
    /// ToDo remove when nav mesh bug is fixed
    entity->SetPosition(0, 0, 0);
    entity->SetRotation(0, 180, 0);
    ///

With the SetPosition command commented out, I can now produce the error...

[Andy90]

yeah i changed this. Forgot about it

 

[Josh]

The behavior is definitely doing something strange. I am going to try getting rid of the player and just creating a simple nav agent in the main code file...

[Josh]

This is what you need at the bottom of MouseMovementController::Start:

///Create a new NavAgent for the player character
this->agent = CreateNavAgent(this->nav_mesh);
this->agent->SetPosition(entity->GetPosition(true));
entity->SetPosition(0, 0, 0);
entity->SetRotation(0, 0, 0);
entity->Attach(agent);

The player's position and rotation are retained as the local offset and rotation when it is attached to the navagent. This allows you to set an offset, or reverse the orientation of the player. However, as we have seen, this can be confusing and cause unintended consequences, so maybe the command should include an optional offset position and rotation instead.

[Andy90]

Its working. Thanks. Maybe an example within the documentation would be nice. So other ppl wont have this issue. 

This is the current code from Ultra Engine - Best game engine for VR optimized for fastest virtual reality 3D performance

#include "UltraEngine.h"

using namespace UltraEngine;

int main(int argc, const char* argv[])
{
    //Get the displays
    auto displays = GetDisplays();

    //Create a window
    auto window = CreateWindow("Ultra Engine", 0, 0, 1280, 720, displays[0], WINDOW_CENTER | WINDOW_TITLEBAR);

    //Create a framebuffer
    auto framebuffer = CreateFramebuffer(window);

    //Create a world
    auto world = CreateWorld();

    //Create a camera    
    auto camera = CreateCamera(world);
    camera->SetFov(70);
    camera->SetClearColor(0.125);
    camera->SetPosition(0, 3, -6);
    camera->SetRotation(35,0,0);

    //Create light
    auto light = CreateBoxLight(world);
    light->SetRange(-20, 20);
    light->SetArea(20, 20);
    light->SetRotation(35, 35, 0);
    light->SetColor(3);

    //Create scene
    auto ground = CreateBox(world, 10, 1, 10);
    ground->SetPosition(0, -0.5, 0);
    ground->SetColor(0, 1, 0);
    auto wall = CreateBox(world, 1, 2, 4);

    //Create navmesh
    auto navmesh = CreateNavMesh(world, 10, 5, 10, 4, 4);
    navmesh->Build();

    //Create player
    auto player = CreateCylinder(world, 0.4, 1.8);
    player->SetNavObstacle(false);
    player->SetColor(0, 0, 1);
    auto agent = CreateNavAgent(navmesh);
    player->Attach(agent);

    //Main loop
    while (window->Closed() == false and window->KeyDown(KEY_ESCAPE) == false)
    {
        if (window->MouseHit(MOUSE_LEFT))
        {
            auto mousepos = window->GetMousePosition();
            auto rayinfo = camera->Pick(framebuffer, mousepos.x, mousepos.y);
            if (rayinfo.success)
            {
                agent->Navigate(rayinfo.position);
            }
        }

        world->Update();
        world->Render(framebuffer);
    }
    return 0;
}