clothsimulation/clothParticle.cpp at master · misabel/clothsimulation · GitHub

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// Thanks to "Advanced Character Physics" written by Thomas Jakobsen
#include "clothParticle.h"


ClothParticle::ClothParticle(bool fixed){
	_mass = 1;
	_position = Vec3f(0.0);
	_prevPosition = Vec3f(0.0);
	_velocity = Vec3f(0.0);
	_isFixed = fixed;
	_acc = Vec3f(0.0);

	// _state = new Vec3f[2];
	// _forces = Vec3f(0.0);
	// updateState();
}
ClothParticle::ClothParticle(float mass, const Vec3f Position, const Vec3f Velocity, bool fixed){
	_mass = mass;
	_position = Vec3f(Position);
	_velocity = Velocity;
	_isFixed = fixed;
	_acc = Vec3f(0.0);
	_prevPosition = Vec3f(0.0);
	// _state = new Vec3f[2];
	// _forces = Vec3f(0.0);
	// updateState();
}
ClothParticle::ClothParticle(const Vec3f Position, const Vec3f Velocity, bool fixed)
{
	_mass = 1.0;
	_position = Vec3f(Position);
	_velocity = Velocity;
	_isFixed = fixed;
	_acc = Vec3f(0.0);
	_prevPosition = Vec3f(0.0);
	// _state = new Vec3f[2];
	// _forces = Vec3f(0.0);
	// updateState();
}
ClothParticle::ClothParticle(const Vec3f Position, bool fixed)
{
	_mass = 1.0;
	_position = Vec3f(Position);
	_velocity = Vec3f(0.0);
	_isFixed = fixed;
	_acc = Vec3f(0.0);
	_prevPosition = Vec3f(0.0);
	// _state = new Vec3f[2];
	// _forces = Vec3f(0.0);
	// updateState();

}

void ClothParticle::drawClothParticle() {

    glPointSize(3.0f); // when something get checked, enable it
    glBegin(GL_POINTS);
    	glColor3f(0.0f, 0.0f, 1.0f);
		glVertex3f(_position[0], _position[1], _position[2]);
	glEnd();
}


// void ClothParticle::addForce(Vec3f force)
// {
// 	_forces += force;

// }

// Vec3f* ClothParticle::getState()
// {
// 	return _state;
// }

// void ClothParticle::setState(Vec3f p, Vec3f v)
// {
// 	_position = p;
// 	// _position[0] = 0.0;
// 	// _position[2] = 0.0;
// 	_velocity = v;
// 	updateState();
// }

// void ClothParticle::updateState()
// {
// 	_state[0] = _position;
// 	_state[1] = _velocity;

// 	// cout << "velocity is: " << _velocity[0] << ", " << _velocity[1] << ", " << _velocity[2] << endl;
// }

void ClothParticle::setPosition(Vec3f p)
{
	_position = p;
	// updateState();
}

void ClothParticle::setVelocity(Vec3f v)
{
	_velocity = v;
	// updateState();
}

void ClothParticle::derivEval(float deltaT, Vec3f forces)
{
	Vec3f new_position = _velocity * deltaT;
	Vec3f new_velocity = forces/_mass * deltaT;

	_position += new_position;
	_velocity += new_velocity;
	// Vec3f derivative[2] = {_velocity, (_forces/_mass)};
	// cout << _velocity[0] << ", " << _velocity[1] << ", " << _velocity[2] << endl;
	// _forces = Vec3f(0.0);
	// cout << _forces[1] << endl;
	// return derivative;
}

void ClothParticle::update(float t) {

	if(!_isFixed) {

		Vec3f old_pos = _position;
		_position = _position + (_position - _prevPosition) * (1.0 - 0.01) + _acc * (t * t);
		// _position = _position + (1.0 - 0.02) * (_position - _prevPosition) + _acc * t;
		_prevPosition = old_pos;
		_acc = Vec3f(0.0);

	}
}