// A method that calculates a steering force towards a target
// STEER = DESIRED MINUS VELOCITY
Vec2f Vehicle::seek( Vec2f target )
{
Vec2f desired = target - mLocation; // A vector pointing from the location to the target
// Normalize desired and scale to maximum speed
desired.normalize();
desired *= mMaxSpeed;
// Steering = Desired minus velocity
Vec2f steer = desired - mVelocity;
steer.limit( mMaxForce ); // Limit to maximum steering force
return steer;
}
void VectorFlowField::update()
{
if(! mChannel) return;
if((timeline().getCurrentTime() - mPrevTime) > 0.01){
float newX = mWindDirection.x*cos(mTheta) - mWindDirection.y*sin(mTheta);
float newY = mWindDirection.x*sin(mTheta) + mWindDirection.y*cos(mTheta);
mWindDirection.x = newX;
mWindDirection.y = newY;
mWindDirection.normalize();
mPrevTime = timeline().getCurrentTime();
}
mParticleController->update(mChannel, mWindDirection);
//Cloud stuff
checkRespawn();
//Cloud controllers
if(!mCloudControllers->empty()){
for(int i = 0; i < mCloudControllers->size(); i++){
glPushMatrix();
//Steer the cloud controller
Vec2f desiredDir = mParticleController->flowLookUp((*mCloudControllers)[i]->mLoc);
desiredDir = desiredDir * (*mCloudControllers)[i]->mMaxSpeed;
Vec2f steer = desiredDir - (*mCloudControllers)[i]->mVel;
steer.limit((*mCloudControllers)[i]->mMaxForce);
(*mCloudControllers)[i]->applyForce(steer);
//update its position
(*mCloudControllers)[i]->update();
glPopMatrix();
}
}
//Cloud particles
if(mCloudParticle !=NULL){
glPushMatrix();
mCloudParticle->updateGPUcloudControllers();
mCloudParticle->update();
glPopMatrix();
}
}