This functions adds an axle between a left and right tire. Vehicles with axles specified will have more accurate physics.

Syntax

• void AddAxle(int lefttire, int righttire)

Parameters

• lefttire: the index of the left tire.
• righttire: the index of the left tire.

Example

#include "Leadwerks.h"

using namespace Leadwerks;

Vehicle* vehicle = NULL;
Model* tiremodel[4];

int main(int argc, const char *argv[])
{
        Leadwerks::Window* window = Leadwerks::Window::Create();
        Context* context = Context::Create(window);
        World* world = World::Create();
        Camera* camera = Camera::Create();
        //Create a window
        window = Window::Create("Vehicle Example", 0, 0, 1024, 768);

        //Create a graphics context
        context = Context::Create(window, 0);

        //Create a world
        world = World::Create();

        //Create a camera
        camera = Camera::Create();
        camera->SetPosition(0, 2, -5);

        //Create the ground
        Entity* ground = Model::Box();
        Shape* shape = Shape::Box();
        ground->SetShape(shape);
        shape->Release();
        ground->SetScale(1000, 1, 1000);
        ground->SetPosition(0, -0.5, 0);
        ground->SetCollisionType(Collision::Scene);
        ground->SetColor(0, 1, 0, 1);

        Light* light = DirectionalLight::Create();
        light->SetRotation(45, 35, 0);

        //Create the vehicle chassis
        Model* chassis = Model::Box();
        shape = Shape::Box();
        chassis->SetShape(shape);
        shape->Release();
        chassis->SetScale(1.5, 1, 4);
        chassis->SetMass(2000);
        chassis->SetCollisionType(Collision::Prop);
        chassis->SetColor(1, 0, 0, 1);
        chassis->SetPosition(0, 1, 0);

        //Create the vehicle
        vehicle = Vehicle::Create(chassis);

        //Add tires
        float tireradius = 0.5;
        float tiremass = 100;
        float tirewidth = 0.5;
        float tireheight = -0.5;
        float tirespacing = 0.6;

        tiremodel[0] = Model::Cylinder();
        tiremodel[0]->SetScale(tireradius * 2, tirewidth, tireradius * 2);
        tiremodel[0]->SetRotation(0, 0, 90);
        tiremodel[0]->SetPosition(tirespacing, tireheight, 1.5);
        vehicle->AddTire(tirespacing, tireheight, 1.5, tiremass, tireradius, tirewidth, true);

        tiremodel[1] = Model::Cylinder();
        tiremodel[1]->SetScale(tireradius * 2, tirewidth, tireradius * 2);
        tiremodel[1]->SetRotation(0, 0, 90);
        tiremodel[1]->SetPosition(-tirespacing, tireheight, 1.5);
        vehicle->AddTire(-tirespacing, tireheight, 1.5, tiremass, tireradius, tirewidth, true);

        tiremodel[2] = Model::Cylinder();
        tiremodel[2]->SetScale(tireradius * 2, tirewidth, tireradius * 2);
        tiremodel[2]->SetRotation(0, 0, 90);
        tiremodel[2]->SetPosition(tirespacing, tireheight, -1.5);
        vehicle->AddTire(tirespacing, tireheight, -1.5, tiremass, tireradius, tirewidth, false);

        tiremodel[3] = Model::Cylinder();
        tiremodel[3]->SetScale(tireradius * 2, tirewidth, tireradius * 2);
        tiremodel[3]->SetRotation(0, 0, 90);
        tiremodel[3]->SetPosition(-0.5, tireheight, -1.5);
        vehicle->AddTire(-tirespacing, tireheight, -1.5, tiremass, tireradius, tirewidth, false);

        //Add axles
        vehicle->AddAxle(0, 1);
        vehicle->AddAxle(2, 3);

        //Finalize the vehicle
        Debug::Assert(vehicle->Build(), "Failed to build vehicle.");

        //Start the engine
        vehicle->SetEngineRunning(true);

        //Release the handbrakes
        vehicle->SetHandBrakes(0);

        while (true)
        {
                //If window has been closed, end the program
                if (window->Closed() || window->KeyDown(Key::Escape)) return false;

                //Update the app timing
                Leadwerks::Time::Update();

                //Update steering
                float steering = 0;
                if (window->KeyDown(Key::D)) steering += 30;
                if (window->KeyDown(Key::A)) steering -= 30;
                vehicle->SetSteering(steering);

                //Update acceleration
                float gas = 0;
                if (window->KeyDown(Key::W)) gas += 0.25;
                if (window->KeyDown(Key::S)) gas -= 0.25;
                vehicle->SetAcceleration(gas);

                //Update brakes
                if (window->KeyDown(Key::Space))
                {
                        vehicle->SetBrakes(2000);
                }
                else
                {
                        vehicle->SetBrakes(0);
                }

                //Update the world
                world->Update();

                //Update tire models to match physics
                for (int n = 0; n < 4; n++)
                {
                        Vec3 scale = tiremodel[n]->GetScale();
                        tiremodel[n]->SetMatrix(vehicle->GetTireMatrix(n));
                        tiremodel[n]->Turn(0, 0, 90);
                        tiremodel[n]->SetScale(scale);
                }

                //Render the world
                world->Render();

                //Refresh the screen
                context->Sync(true);

        }
        return 0;
}