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3. Creating and Setting Up a Camera

Warning
The scope of applications for UnigineScript is limited to implementing materials-related logic (material expressions, scriptable materials, brush materials). Do not use UnigineScript as a language for application logic, please consider C#/C++ instead, as these APIs are the preferred ones. Availability of new Engine features in UnigineScipt (beyond its scope of applications) is not guaranteed, as the current level of support assumes only fixing critical issues.

<< RETURN TO THE PREVIOUS SECTION

A camera is a viewport to the world, without it you actually won't be able to see anything. Cameras in UNIGINE are managed using players. When you add a new player, it creates a camera and specifies controls, masks, postprocess materials for this camera.

In order to set a new player as active one we should use the Game class which is designed as a singleton.

Notice
In order to use the Game class and PlayerSpectator class we must include the UnigineGame.h and the UniginePlayers.h libraries.

The following code illustrates creation of a PlayerSpectator and setting it as the active game camera.

Notice
By default the player uses a standard set of controls which can be overridden if necessary.
Source code (UnigineScript)
#include <core/unigine.h>

int init() {
	// creating a new PlayerSpectator instance
	PlayerSpectator playerSpectator = new PlayerSpectator();

	// setting necessary parameters: FOV, ZNear, ZFar, view direction vector and position.
	playerSpectator.setFov(90.0f);
	playerSpectator.setZNear(0.1f);
	playerSpectator.setZFar(10000.0f);
	playerSpectator.setViewDirection(vec3(0.0f, 1.0f, 0.0f));
	playerSpectator.setWorldPosition(dvec3(-1.6f, -1.7f, 1.7f));

	// setting the player as a default one via the Game singleton instance
	engine.game.setPlayer(playerSpectator);

	return 1;
}

Additional information:

  • For more information on players, see the Players article.
  • For more information on players API, see the Players-Related Classes article.
  • For more information on the Game class, see the Game class article.

Project Progress#

In our project we are going to use only one PlayerSpectator. To create and initialize it let us write a method called initPlayer.

In the AppWorldLogic.h file, we include the UnigineGame.h library, define a smart pointer for our player and declare our initPlayer method.

Source code (C++)
// AppWorldLogic.h
/* ... */
#include <UnigineGame.h>

/* ... */

class AppWorldLogic : public Unigine::WorldLogic {
	
public:

/* .. */

private:

/* .. */

	int initPlayer();
	
/* .. */

	// player
	Unigine::PlayerSpectatorPtr player;
	
/* .. */
};

In the AppWorldLogic.cpp file let us implement our initPlayer method and insert it into the AppWorldLogic::init() method.

Source code (C++)
// AppWorldLogic.cpp

/* .. */

/// method performing initialization of the player
int AppWorldLogic::initPlayer()
{
	// creating a new PlayerSpectator instance
	player = PlayerSpectator::create();

	// setting player's FOV, ZNear, ZFar
	player->setFov(90.0f);
	player->setZNear(0.1f);
	player->setZFar(10000.0f);

	// setting player's view direction vector and position
	player->setPosition(Math::Vec3(3.0f));
	player->setDirection(Math::vec3(-1.0f), Math::vec3(0.0f, 0.0f, -1.0f));

	// setting the player as a default one via the Game singleton instance
	Game::setPlayer(player);

	// reporting progress to the console
	Log::warning("\nPlayer initialization OK!\n\n");

	return 1;
}

/* .. */
	
int AppWorldLogic::init() 
{

/* .. */

	// creating a player
	initPlayer();

/* .. */
	
	return 1;
}
/* .. */

Source Files

You can copy the code below and paste it to the corresponding source files of your project:

AppWorldLogic.h

Source code (C++)
#ifndef __APP_WORLD_LOGIC_H__
#define __APP_WORLD_LOGIC_H__

#include <UnigineLogic.h>
#include <UnigineStreams.h>
#include <UnigineObjects.h>
#include <UnigineGame.h>

using namespace Unigine;

class AppWorldLogic : public WorldLogic {
	
public:
	AppWorldLogic();
	virtual ~AppWorldLogic();
	
	virtual int init();
	
	virtual int update();
	virtual int postUpdate();
	virtual int updatePhysics();
	
	virtual int shutdown();
	
	virtual int save(const StreamPtr &stream);
	virtual int restore(const StreamPtr &stream);
private:
	PlayerSpectatorPtr player;

	// auxiliary functions
	int addMeshToScene(const char *file_name, const char *mesh_name, const char *material_name, Math::Vec3 position);

	// initialization functions
	int initObjects();
	int initPlayer();

	// scene objects vector
	Vector <ObjectMeshDynamicPtr> Objects;
};

#endif // __APP_WORLD_LOGIC_H__

AppWorldLogic.cpp

Source code (C++)
#include "AppWorldLogic.h"
// World logic, it takes effect only when the world is loaded.
// These methods are called right after corresponding world script's (UnigineScript) methods.
//-----------------------------------------------------------------------------------------------------------------------------
//---------------------------------------------- AUXILIARY FUNCTIONS AND METHODS ----------------------------------------------
//-----------------------------------------------------------------------------------------------------------------------------

/// method adding a Dynamic Mesh Object to the scene. If an empty filename is passed the method creates a default box; otherwise, loads a mesh-file with a given name.
int AppWorldLogic::addMeshToScene(const char *file_name, const char *mesh_name, const char *material_name, Math::Vec3 position)
{
	MeshPtr mesh = Mesh::create();
	ObjectMeshDynamicPtr omd;
	if (file_name) {				// loading a mesh from a specified file
		if (!mesh->load(file_name))
		{
			Log::error("\nError opening .mesh file!\n");
			mesh.clear();

			return 0;
		}
		else omd = ObjectMeshDynamic::create(mesh);
	}
	else							// creating a default box
	{
		mesh->addBoxSurface("box_surface", Math::vec3(0.5f));

		omd = ObjectMeshDynamic::create(mesh);
	}

	// setting node material, name and position
	omd->setMaterial(material_name, "*");
	omd->setName(mesh_name);
	omd->setWorldPosition(position);

	// updating the list of scene objects
	Objects.append(omd);

	// reporting progress to the console
	Log::message("-> Object %s added to the scene.\n", mesh_name);

	// clearing the mesh
	mesh.clear();

	return 1;

}
//-----------------------------------------------------------------------------------------------------------------------------
//---------------------------------------------- INITIALIZATION METHODS -------------------------------------------------------
//-----------------------------------------------------------------------------------------------------------------------------
/// method performing initialization of the set of 4 boxes
int AppWorldLogic::initObjects()
{
	int index = 0;

	for (int x = 0; x < 2; x++)
	{
		for (int y = 0; y < 2; y++)
		{
			addMeshToScene(NULL, String::format("my_meshdynamic_%d", index), "mesh_base", Math::Vec3(x, y, 1.0f));
			index++;
		}
	}

	// reporting progress to the console
	Log::warning("Objects generation OK!\n\n");

	return 1;
}
//-----------------------------------------------------------------------------------------------------------------------------
/// method performing initialization of the player
int AppWorldLogic::initPlayer()
{
	// creating a new PlayerSpectator instance
	player = PlayerSpectator::create();

	// setting player's FOV, ZNear, ZFar
	player->setFov(90.0f);
	player->setZNear(0.1f);
	player->setZFar(10000.0f);

	// setting player's view direction vector and position
	player->setPosition(Math::Vec3(3.0f));
	player->setDirection(Math::vec3(-1.0f), Math::vec3(0.0f, 0.0f, -1.0f));

	// setting the player as a default one via the Game singleton instance
	Game::setPlayer(player);

	// reporting progress to the console
	Log::warning("\nPlayer initialization OK!\n\n");

	return 1;
}
//-----------------------------------------------------------------------------------------------------------------------------
AppWorldLogic::AppWorldLogic() {

}

AppWorldLogic::~AppWorldLogic() {

}

int AppWorldLogic::init() {
	// Write here code to be called on world initialization: initialize resources for your world scene during the world start.

	// creating objects
	initObjects();

	// creating a player
	initPlayer();

	return 1;
}

// start of the main loop
int AppWorldLogic::update() {
	// Write here code to be called before updating each render frame: specify all graphics-related functions you want to be called every frame while your application executes.

	return 1;
}

int AppWorldLogic::postUpdate() {
	// The engine calls this function before rendering each render frame: correct behavior after the state of the node has been updated.

	return 1;
}

int AppWorldLogic::updatePhysics() {
	// Write here code to be called before updating each physics frame: control physics in your application and put non-rendering calculations.
	// The engine calls updatePhysics() with the fixed rate (60 times per second by default) regardless of the FPS value.
	// WARNING: do not create, delete or change transformations of nodes here, because rendering is already in progress.

	return 1;
}
// end of the main loop

int AppWorldLogic::shutdown() {
	// Write here code to be called on world shutdown: delete resources that were created during world script execution to avoid memory leaks.

	// deleting all created nodes
	for (int i = 0; i < Objects.size(); i++)
	{
		// removing current node from the scene
		Objects[i]->deleteLater();
	}

	// updating the list of scene objects
	Objects.clear();

	// clearing the player pointer
	player->deleteLater();

	return 1;
}

int AppWorldLogic::save(const StreamPtr &stream) {
	// Write here code to be called when the world is saving its state (i.e. state_save is called): save custom user data to a file.

	UNIGINE_UNUSED(stream);
	return 1;
}

int AppWorldLogic::restore(const StreamPtr &stream) {
	// Write here code to be called when the world is restoring its state (i.e. state_restore is called): restore custom user data to a file here.

	UNIGINE_UNUSED(stream);
	return 1;
}


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Last update: 2020-07-31
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