Creating Pylons and Wires Using Ropes

// AppWorldLogic.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Unigine;

namespace UnigineApp
{
	class AppWorldLogic : WorldLogic
	{
		// World logic, it takes effect only when the world is loaded.
		// These methods are called right after corresponding world script's (UnigineScript) methods.

        ObjectDummy dummy1;
        ObjectDummy dummy2;
        ObjectMeshDynamic pylon1;
        ObjectMeshDynamic pylon2;
        ObjectMeshDynamic rope;
		PlayerSpectator player;
		
        /// method, creating a named pylon with a specified radius and height at pos	
        ObjectMeshDynamic create_pylon(String name, float radius, float length, vec3 pos)
        {
	        // creating a cylinder dynamic mesh
	        ObjectMeshDynamic OM = Primitives.createCylinder(radius, length, 1, 6);
	
	        // setting parameters
	        OM.setWorldTransform(new dmat4(MathLib.translate(pos)));
	        OM.setMaterial("mesh_base", "*");
	        OM.setMaterialParameter("albedo_color", new vec4(0.1f, 0.1f, 0.0f, 1.0f), 0);
	        OM.setProperty("surface_base", "*");
	        OM.setName(name);

	        //passing node ownership to the Editor
	        OM.release();
	        Editor.get().addNode(OM.getNode());

	        return OM;
        }

        /// method, creating a named dummy body of a specified size at pos
        ObjectDummy createBodyDummy(String name, vec3 size, vec3 pos)
        {
	        // creating a dummy object
	        ObjectDummy OMD = new ObjectDummy();

        	// setting parameters
	        OMD.setWorldTransform(new dmat4(MathLib.translate(pos)));
	        OMD.setName(name);

	        //assigning a dummy body to the dummy object and adding a box shape	to it
	        new BodyDummy(OMD.getObject());
	        OMD.getBody().addShape(new ShapeBox(size).getShape(), MathLib.translate(0.0f, 0.0f, 0.0f));

	        //passing node ownership to the Editor
	        OMD.release();
	        Editor.get().addNode(OMD.getNode());

	        return OMD;
        }

        /// method, creating a named rope with specified parameters at pos
        ObjectMeshDynamic createBodyRope(String name, float radius, float length, int segments, int slices, dmat4 tm)
        {
	        // creating a cylinder dynamic mesh
	        ObjectMeshDynamic OMD = Primitives.createCylinder(radius, length, segments, slices);

	        // setting parameters
	        OMD.setWorldTransform(tm);
	        OMD.setMaterial("mesh_base", "*");
	        OMD.setMaterialParameter("albedo_color", new vec4(0.5f, 0.5f, 0.0f, 1.0f), 0);
	        OMD.setProperty("surface_base", "*");
	        OMD.setName(name);

	        //assigning a rope body to the dynamic mesh object and setting rope parameters
	        BodyRope body = new BodyRope(OMD.getObject());
	        body.setMass(1.0f);
	        body.setRadius(0.25f);
	        body.setFriction(0.5f);
	        body.setRestitution(0.05f);
	        body.setRigidity(0.05f);
	        body.setLinearStretch(0.5f);

	        //passing node ownership to the Editor
	        OMD.release();
	        Editor.get().addNode(OMD.getNode());

	        return OMD;
        }

		/* .. */

		public override int init()
		{
        	// setting up player
	        player = new PlayerSpectator();
	        player.release();
	        player.setPosition(new dvec3(0.0f, -23.401f, 15.5f));
	        player.setDirection(new vec3(0.0f, 1.0f, -0.4f), new vec3(0.0f, 0.0f, -1.0f));
	        Game.get().setPlayer(player.getPlayer());

        	// creating dummy objects to attach a rope to and placing them on the top of each pylon
	        dummy1 = createBodyDummy("fixpoint1", new vec3(0.5f, 0.5f, 0.5f), new vec3(-12.0f, 0.0f, 15.0f));
	        dummy2 = createBodyDummy("fixpoint2", new vec3(0.5f, 0.5f, 0.5f), new vec3(12.0f, 0.0f, 15.0f));
	
	        // creating pylons 
	        pylon1 = create_pylon("Pylon1", 0.3f, 17, new vec3(-12.2f, 0.0f, 7.0f));
	        pylon2 = create_pylon("Pylon2", 0.3f, 17, new vec3(12.2f, 0.0f, 7.0f));
	
	        // creating a rope
	        rope = createBodyRope("MyRope", 0.05f, 24, 96, 6, new dmat4(MathLib.translate(0.0f, 0.0f, 15.0f)*MathLib.rotateY(-90.0f)));

            // creating 2 particles joints to attach the rope to dummy bodies
	        new JointParticles(dummy1.getBody(), rope.getBody(), dummy1.getPosition(), new vec3(0.55f));
	        new JointParticles(dummy2.getBody(), rope.getBody(), dummy2.getPosition(), new vec3(0.55f));

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