inline void DiGravityController::Control(DiParticleElement* particleTechnique, DiParticle* particle, float timeElapsed)
{
DiVec3 distance = mDerivedPosition - particle->position;
float length = distance.squaredLength();
float scaleVelocity = 1.0f;
if (mParentElement)
scaleVelocity = mParentElement->GetParticleSystemScaleVelocity();
if (length > 0 && mParentElement)
{
//float force = (mGravity * particle->mass * mass) / length;
float force = (scaleVelocity * mGravity * particle->mass * mass) / length;
particle->direction += force * distance * timeElapsed * CalculateAffectSpecialisationFactor(particle);
}
}
bool DiCameraHelper::Update( float elapsed )
{
if (!mEnabled)
{
return false;
}
if (mStyle == CS_FREELOOK)
{
DiVec3 accel = DiVec3::ZERO;
if (mGoingForward)
{
accel += mCamera->GetDirection();
}
if (mGoingBack) accel -= mCamera->GetDirection();
if (mGoingRight) accel += mCamera->GetRight();
if (mGoingLeft) accel -= mCamera->GetRight();
if (mGoingUp) accel += mCamera->GetUp();
if (mGoingDown) accel -= mCamera->GetUp();
float topSpeed = mFastMove ? mTopSpeed * 20 : mTopSpeed;
if (accel.squaredLength() != 0)
{
accel.normalise();
mVelocity += accel * topSpeed * elapsed * 10;
}
else
{
mVelocity -= mVelocity * elapsed * 10;
}
float tooSmall = std::numeric_limits<float>::epsilon();
if (mVelocity.squaredLength() > topSpeed * topSpeed)
{
mVelocity.normalise();
mVelocity *= topSpeed;
}
else if (mVelocity.squaredLength() < tooSmall * tooSmall)
{
mVelocity = DiVec3::ZERO;
}
if (mVelocity != DiVec3::ZERO)
{
mCamera->Move(mVelocity * elapsed);
}
}
else if (mStyle == CS_SMOOTH)
{
if (Driver && mMousePos.x >= 0 && mMousePos.y >= 0)
{
DiRenderWindow* window = Driver->GetMainRenderWindow();
int x = (mMousePos.x - window->GetWidth() / 2);
int y = (mMousePos.y - window->GetHeight() / 2);
DiVec3 pos = mCamera->GetPosition();
pos.x += (x - pos.x) * 0.01f;
pos.y += (-y - pos.y) * 0.01f;
mCamera->SetPosition(pos);
mCamera->LookAt(0, 0, 0);
}
}
return true;
}
