void ClothSystem::initStructuralSprings()
{
float springConst = 200.0;
float restLength = 1.0 * CLOTH_DETAIL;
for (int i = 0; i < CLOTH_HEIGHT; ++i)
{
for (int k = 0; k < CLOTH_WIDTH; ++k)
{
int ind = indexOf(i, k);
int up = indexOf(i-1, k);
int down = indexOf(i+1, k);
int left = indexOf(i, k-1);
int right = indexOf(i, k+1);
if (i != 0)
{
setSpring(ind, up, springConst, restLength);
}
if (i != CLOTH_HEIGHT - 1)
{
setSpring(ind, down, springConst, restLength);
}
if (k != 0)
{
setSpring(ind, left, springConst, restLength);
}
if (k != CLOTH_WIDTH - 1)
{
setSpring(ind, right, springConst, restLength);
}
}
}
}
void ClothSystem::initShearSprings()
{
float springConst = 200.0;
float restLength = sqrt(2) * CLOTH_DETAIL;
for (int i = 0; i < CLOTH_HEIGHT; ++i)
{
for (int k = 0; k < CLOTH_WIDTH; ++k)
{
int ind = indexOf(i, k);
int upLeft = indexOf(i-1, k-1);
int downRight = indexOf(i+1, k+1);
int downLeft = indexOf(i+1, k-1);
int upRight = indexOf(i-1, k+1);
if ( i != 0 && k != CLOTH_WIDTH - 1 )
{
setSpring(ind, upRight, springConst, restLength);
}
if ( i != 0 && k != 0)
{
setSpring(ind, upLeft, springConst, restLength);
}
if ( i != CLOTH_HEIGHT - 1 && k != 0 )
{
setSpring(ind, downLeft, springConst, restLength);
}
if (i != CLOTH_HEIGHT - 1 && k != CLOTH_WIDTH - 1)
{
setSpring(ind, downRight, springConst, restLength);
}
}
}
}
void ClothSystem::initFlexSprings()
{
float springConst = 200.0;
float restLength = 2.0 * CLOTH_DETAIL;
for (int i = 0; i < CLOTH_HEIGHT; ++i)
{
for (int k = 0; k < CLOTH_WIDTH; ++k)
{
int ind = indexOf(i, k);
int up = indexOf(i-2, k);
int down = indexOf(i+2, k);
int left = indexOf(i, k-2);
int right = indexOf(i, k+2);
if (i > 1)
{
setSpring(ind, up, springConst, restLength);
}
if (i < 6)
{
setSpring(ind, down, springConst, restLength);
}
if (k > 1)
{
setSpring(ind, left, springConst, restLength);
}
if (k < 6)
{
setSpring(ind, right, springConst, restLength);
}
}
}
}
bool GSpringDamperJoint::setSpring(RMatrix K_)
{
if ( K_.RowSize() * K_.ColSize() != pJoint->getDOF() ) return false;
return setSpring(K_.GetPtr());
}
