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Warning! This version of documentation is OUTDATED, as it describes an older SDK version! Please switch to the documentation for the latest SDK version.
Warning! This version of documentation describes an old SDK version which is no longer supported! Please upgrade to the latest SDK version.

Creating Pylons and Wires Using Ropes

A Wire Attached to Pylons

A Wire Attached to Pylons

This example shows how to create a wire using a rope body and attach it to pylons. A tutorial teaching how to reproduce the same scene in UnigineEditor can be found here.

In the AppWorldLogic.h file, define smart pointers for the objects of our scene.

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

/* .. */

class AppWorldLogic : public Unigine::WorldLogic {
	
public:
	/* .. */

private:
	Unigine::ObjectDummyPtr dummy1;
	Unigine::ObjectDummyPtr dummy2;
	Unigine::ObjectMeshDynamicPtr pylon1;
	Unigine::ObjectMeshDynamicPtr pylon2;
	Unigine::ObjectMeshDynamicPtr rope;
	Unigine::PlayerSpectatorPtr player;
};

Insert the following code into the AppWorldLogic.cpp file.

Notice
Unchanged methods of the AppWorldLogic class are not listed here, so leave them as they are.
Source code (C++)
/* .. */
#include "UnigineGame.h"
#include "UniginePrimitives.h"
#include "UnigineObjects.h"

using namespace Unigine;
using namespace Math;

/* .. */
			
/// function, creating a named pylon with a specified radius and height at pos	
ObjectMeshDynamicPtr create_pylon(char *name, float radius, float length, const vec3& pos)
{
	// creating a cylinder dynamic mesh
	ObjectMeshDynamicPtr OM = Primitives::createCylinder(radius, length, 1, 6);
	
	// setting parameters
	OM->setWorldTransform(Mat4(translate(pos)));
	OM->setMaterial("mesh_base", "*");
	OM->setMaterialParameterFloat4("albedo_color", vec4(0.1f, 0.1f, 0.0f, 1.0f), 0);
	OM->setName(name);

	return OM;
}

/// function, creating a named dummy body of a specified size at pos
ObjectDummyPtr createBodyDummy(char *name, const vec3& size, const vec3& pos)
{
	// creating a dummy object
	ObjectDummyPtr OMD = ObjectDummy::create();

	// setting parameters
	OMD->setWorldTransform(Mat4(translate(pos)));
	OMD->setName(name);

	//assigning a dummy body to the dummy object and adding a box shape	to it
	BodyDummy::create(OMD);
	OMD->getBody()->addShape(ShapeBox::create(size), translate(0.0f, 0.0f, 0.0f));


	return OMD;
}

/// function, creating a named rope with specified parameters at pos
ObjectMeshDynamicPtr createBodyRope(char *name, float radius, float length, int segments, int slices, const Mat4& tm)
{
	// creating a cylinder dynamic mesh
	ObjectMeshDynamicPtr OMD = Primitives::createCylinder(radius, length, segments, slices);

	// setting parameters
	OMD->setWorldTransform(tm);
	OMD->setMaterial("mesh_base", "*");
	OMD->setMaterialParameterFloat4("albedo_color", vec4(0.5f, 0.5f, 0.0f, 1.0f), 0);
	OMD->setName(name);

	//assigning a rope body to the dynamic mesh object and setting rope parameters
	BodyRopePtr body = BodyRope::create(OMD);
	body->setMass(1.0f);
	body->setRadius(0.25f);
	body->setFriction(0.5f);
	body->setRestitution(0.05f);
	body->setRigidity(0.05f);
	body->setLinearStretch(0.5f);

	return OMD;
}

/* .. */

int AppWorldLogic::init() {

	// setting up player
	player = PlayerSpectator::create();
	
	player->setPosition(Vec3(0.0f, -23.401f, 15.5f));
	player->setDirection(vec3(0.0f, 1.0f, -0.4f), vec3(0.0f, 0.0f, -1.0f));
	Game::setPlayer(player);

	// creating dummy objects to attach a rope to and placing them on the top of each pylon
	dummy1 = createBodyDummy("fixpoint1", vec3(0.5f, 0.5f, 0.5f), vec3(-12.0f, 0.0f, 15.0f));
	dummy2 = createBodyDummy("fixpoint2", vec3(0.5f, 0.5f, 0.5f), vec3(12.0f, 0.0f, 15.0f));
	
	// creating pylons 
	pylon1 = create_pylon("Pylon1", 0.3f, 17, vec3(-12.2f, 0.0f, 7.0f));
	pylon2 = create_pylon("Pylon2", 0.3f, 17, vec3(12.2f, 0.0f, 7.0f));
	
	// creating a rope
	rope = createBodyRope("MyRope", 0.05f, 24, 96, 6, Mat4(translate(0.0f, 0.0f, 15.0f)*rotateY(-90.0f)));
	
	// creating 2 particles joints to attach the rope to dummy bodies
	JointParticles::create(dummy1->getBody(), rope->getBody(), dummy1->getPosition(), vec3(0.55f));
	JointParticles::create(dummy2->getBody(), rope->getBody(), dummy2->getPosition(), vec3(0.55f));

	return 1;
}

/* .. */
Last update: 2021-04-29
Build: ()