Method updateWind

Engine/source/forest/forestWindMgr.cpp:241–316

}

void ForestWindMgr::updateWind(  const Point3F &camPos, 
                                 const TreePlacementInfo &info, 
                                 F32 timeDelta )
{
   PROFILE_SCOPE(ForestWindMgr_updateWind);

   // See if we have the blended source available.
   ForestWindAccumulator *blendDest = NULL;
   {
      IdToWindMap::Iterator iter = mPrevSources->find( info.itemKey );
      if ( iter != mPrevSources->end() )
      {
         blendDest = iter->value;
         mPrevSources->erase( iter );
      }
   }

   // Get some stuff we'll need for finding the emitters.
   F32 treeHeight = info.scale * info.dataBlock->getObjBox().len_z();
   Point3F top = info.pos;
   top.z += treeHeight;
   if ( blendDest )
      top += ( 1.0f / info.scale ) * blendDest->getDirection();

   // Go thru the emitters to accumulate the total wind force.
   VectorF windForce( 0, 0, 0 );

   F32 time = Sim::getCurrentTime() / 1000.0f;

   ForestWindEmitterList::iterator iter = mEmitters.begin();
   for ( ; iter != mEmitters.end(); iter++ )
   {
      ForestWindEmitter *emitter = (*iter);

      // If disabled or no wind object... skip it.
      if ( !emitter->isEnabled() || !emitter->getWind() )
         continue;

      ForestWind *wind = emitter->getWind();

      F32 strength = wind->getStrength();
      
      if ( emitter->isRadialEmitter() )
      {
         Point3F closest = MathUtils::mClosestPointOnSegment( info.pos, top, emitter->getPosition() );
         Point3F dir = closest - emitter->getPosition();
         F32 lenSquared = dir.lenSquared();
         if ( lenSquared > emitter->getWindRadiusSquared() )
            continue;

         dir *= 1.0f / mSqrt( lenSquared );

         F32 att = lenSquared / emitter->getWindRadiusSquared();
         strength *= 1.0f - att;
         windForce += dir * strength;
      }
      else
      {