Cloth Physics

by Robert Stewart · in Torque Game Engine · 10/11/2005 (10:56 pm) · 14 replies · 10/11/2005 (10:57 pm)

//-----------------------------------------------------------------------------
// Torque Game Engine
// Copyright (C) GarageGames.com, Inc.
//-----------------------------------------------------------------------------
#include "console/consoleTypes.h"
#include "core/bitStream.h"
#include "game/fx/particleEmitter.h"
#include "game/fx/particleEngine.h"
#include "math/mathIO.h"
//#include <GL/glut.h>
#include <math.h>
#include <stdio.h>
struct CONSTRAINT
{
	int particle1, particle2;
	float restlength;
};
#define CLOTH_SIZE 500.0f
#define CONSTRAINT_UPDATE 3
#define TEXTURE_SIZE 8
#define CLOTH_RESOLUTION 16
#define TIME_STEP 0.01f
#define TIME_FACTOR TIME_STEP*TIME_STEP

/*Texture object*/
GLuint texName;
/*Texture data array*/
GLubyte texture[3 * TEXTURE_SIZE * TEXTURE_SIZE];
/*Number of particles in the cloth*/
const int numparticles = CLOTH_RESOLUTION * CLOTH_RESOLUTION;
/*Array of forces on the particles in the cloth*/
float forces[numparticles * 3];
/*Array of normals for particles in the cloth*/
float normals[numparticles * 3];
/*First particle array for cloth*/
float cloth1[numparticles * 4];
/*Second particle array for cloth*/
float cloth2[numparticles * 4];
/*Pointer to current cloth array*/
float *currentcloth;
/*Pointer to previous cloth array*/
float *previouscloth;
/*Number of constraints on cloth particle system*/
const int numconstraints = 2 * CLOTH_RESOLUTION * (CLOTH_RESOLUTION - 1)
					+ (CLOTH_RESOLUTION - 1) * (CLOTH_RESOLUTION - 1);
/*Array of constraints on the cloth particle system*/
CONSTRAINT constraints[numconstraints];
/*Position and radius of the sphere*/
float sphere[4] = {0.0f, 0.0f, 0.0f, 1.0f};
/*The gravity force*/
float gravityforce = -9.8f;
/*Variables for controlling the wind*/
float winddirection[3] = {0.0f, 0.0f, -1.0f};
float windspeed = 0.0f;
float windvector[3] = {0.0f, 0.0f, 0.0f};
/*Lighting variables*/
float lightpos[4] = {1.0f, 1.0f, 1.0f, 0.0f};
float lightambient[4] = {0.2f, 0.2f, 0.2f, 1.0f};
float lightdiffuse[4] = {1.0f, 1.0f, 1.0f, 1.0f};
float material[4] = {1.0f, 1.0f, 1.0f, 1.0f};
/*The elapsed time of the program*/
int currenttime = 0;
/*How far into the simulation the program is*/
int simulationtime = 0;
/*Keeps track of where the mouse was last*/
int lastx = 0, lasty = 0;
/*Camera control variables*/
float rotation = 0;
float elevation = 1.0f;
float cameradistance = 8.0f;
float camerapos[3] = {0.0f, 0.0f, 0.0f};

/*Controls what mouse position changes update*/
int controlmode = 0;

/*Stores the current texture used for the flag*/
int currenttexture = 0;

IMPLEMENT_CO_DATABLOCK_V1(ParticleEmitterNodeData);
IMPLEMENT_CO_NETOBJECT_V1(ParticleEmitterNode);
...................................
   addField("velocity", TypeF32,                    Offset(mVelocity,         ParticleEmitterNode));
}

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