PhysicalTrigger Class

#include <core/scripts/primitives.h>

/* .. */

PhysicalTrigger trigger;
ObjectMeshDynamic box1;
ObjectMeshDynamic box2;

// callback function to be fired when a physical object enters the trigger
void trigger_enter(Body body)
{
	// trying to get an object from the body
	Object obj = body.getObject();
	if (obj == NULL)
		return;

	// enabling material emission for all object's surfaces
	for (int i = 0; i < obj.getNumSurfaces(); i++)
		obj.setMaterialState("emission", 1, i);

	// displaying the name of the object entering trigger area
	log.message("\n %s has entered the trigger area!", body.getObject().getName());
}

// callback function to be fired when a physical object leaves the trigger
void trigger_leave(Body body)
{
	// trying to get an object from the body
	Object obj = body.getObject();
	if (obj == NULL)
		return;

	// disabling material emission for all object's surfaces
	for (int i = 0; i < obj.getNumSurfaces(); i++)
		obj.setMaterialState("emission", 0, i);

	// displaying the name of the object leaving trigger area
	log.message("\n %s has left the trigger area!", body.getObject().getName());
}

// function creating a named box having a specified size, color and transformation with a body and a shape
ObjectMeshDynamic createBodyBox(string name, Vec3 size, float mass, Vec4 color, Mat4 transform, int physical_mask)
{
	// creating geometry and setting up its parameters (name, material, property and transformation)
	ObjectMeshDynamic box = Unigine::createBox(size);
	box.setWorldTransform(transform);
	box.setMaterial("mesh_base", "*");
	box.setMaterialParameter("albedo_color", color, 0);
	box.setProperty("surface_base", "*");
	box.setName(name);

	// adding physics, i.e. a rigid body and a box shape with specified mass
	BodyRigid body = class_remove(new BodyRigid(box));
	ShapeBox shape = class_remove(new ShapeBox(size));
	shape.setMass(mass);
	body.addShape(shape, translate(0.0f, 0.0f, 0.0f));
	body.setPhysicalMask(physical_mask);
	body.setFreezable(0);
	
	// passing the node to the Editor
	engine.editor.addNode(node_remove(box));

	return box;
}
 
/* .. */

int init() {
	// setting up a player
	Player player = new PlayerSpectator();
	player.setPosition(Vec3(0.0f,-3.401f,1.5f));
	player.setDirection(Vec3(0.0f,1.0f,-0.4f));
	engine.game.setPlayer(player);
	
	// enabling visualizer to render bounds of the physical trigger	
	engine.console.run("show_visualizer 1");

	// creating a physical trigger and passing it to the Editor
	trigger = new PhysicalTrigger(3,vec3(2.0f, 2.0f, 1.0f));
	engine.editor.addNode(node_remove(trigger));

	// setting trigger's position
	trigger.setPosition(Vec3(0.0f, 0.0f, 1.0f));

	// setting trigger's physical mask equal to 1
	trigger.setPhysicalMask(1);

	// retrieving trigger size
	vec3 size = trigger.getSize();

	// displaying trigger size and shape type
	log.message("\n Trigger parameters size(%f, %f , %f) type: %d", size.x, size.y, size.z, trigger.getShapeType());

	// setting trigger enter callback function
	trigger.setEnterCallback("trigger_enter");

	// setting trigger leave callback function
	trigger.setLeaveCallback("trigger_leave");

	// creating a box with a body and physical mask value equal to 2 to be ignored by the trigger
	box1 = createBodyBox("Box1", vec3(0.2f), 5.0f, vec4(1.0f, 0.0f, 0.0f, 1.0f), translate(Vec3(0.0f, 0.0f, 2.22f)),2);

	// creating a box with a body and physical mask value equal to 1 to affect the trigger
	box2 = createBodyBox("Box2", vec3(0.2f), 0.0f, vec4(1.0f, 1.0f, 0.0f, 1.0f), translate(Vec3(3.5f, 0.0f, 1.2f)),1);

	// displaying physical masks of both boxes and the trigger
	log.message("\n Box1 Physical mask: %d", box1.getBody().getPhysicalMask());
	log.message("\n Box2 Physical mask: %d", box2.getBody().getPhysicalMask());
	log.message("\n Trigger Physical mask: %d", trigger.getPhysicalMask());

	return 1;
}

int update() {
	/* .. */
	
	// showing the bounds of the physical trigger
	trigger.renderVisualizer();

	// changing the position of the second box
	box2.setWorldPosition(box2.getWorldPosition() - Vec3(0.5f * engine.game.getIFps(), 0.0f, 0.0f));

	return 1;
}

/* .. */

int flush() {
	// updating information on trigger contacts
	trigger.updateContacts();
	
	return 1;
}