This function performs a pick operation on a single surface. The start and end pick positions should be in local space. If a radius is specified, it will also be in considered local space.

Syntax

• bool Pick(const Vec3& p0, const Vec3& p1, Pick& pick, float radius = 0.0, bool closest=false)

Parameters

• p0: the origin of the ray.
• p1: the terminal end of the ray.
• pick: a pick object to contain pick information.
• radius: the radius of the ray. If the radius is greater than 0.0, a slower swept sphere collision will be performed.
• closest: if set to true, the closest intersection will be found, otherwise the operation will return as soon as a single intersection is found.

Returns

Returns true if anything is hit, otherwise false is returned.

Example

#include "Leadwerks.h"

using namespace Leadwerks;

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();
        camera->Move(0, 0, -8);
        Light* light = DirectionalLight::Create();
        light->SetRotation(35, 35, 0);
        camera->SetProjectionMode(2);
        camera->SetZoom(50);

        //Create a model
        Model* model = Model::Sphere();
        model->SetScale(3.6);

        //Create a sphere to indicate where the pick hits
        Model* picksphere = Model::Sphere();
        picksphere->SetColor(1.0, 0.0, 0.0);
        picksphere->SetScale(0.5);

        //Get the model surface
        Surface* surface = model->GetSurface(0);

        //Start and end pick points
        Vec3 p0 = Vec3(-10, 1, 0);
        Vec3 p1 = Vec3(10, 1, 0);

        //Typically you would transform the pick points into local space
        p0 = Transform::Point(p0, NULL, model);
        p1 = Transform::Point(p1, NULL, model);

        PickInfo pickinfo;
        if (surface->Pick(p0, p1, pickinfo, 0, true))
        {
                //Transform back to world coordinates
                pickinfo.position = Transform::Point(pickinfo.position, model, NULL);
                picksphere->SetPosition(pickinfo.position);
        }
        else
        {
                picksphere->Release();
        }
        while (true)
        {
                if (window->Closed() || window->KeyDown(Key::Escape)) return false;

                Leadwerks::Time::Update();
                world->Update();
                world->Render();
                context->Sync();
        }
        return 0;
}