Water coverage calculation

To get Erik Madison's swim code working, I fixed the water coverage calculation. I know there's a swim animations thread already describing this problem, but since the water coverage can be used in more places, I thought i might better start a new topic.

Maybe somebody is interested in getting other things to work as well like splash sounds (they don't seem to work properly out of the box for me), bubbles and a "isWet flag" for weapons for example :)

Here are the changes I made to TGEA 1.0.3:

In game/shapeBase.cpp - waterFind function I changed

if (wbox.isOverlapped(sbox)) {
      sWaterType = wb->getLiquidType();
      if (wbox.max.z < sbox.max.z)
         sWaterCoverage = (wbox.max.z - sbox.min.z) / (sbox.max.z - sbox.min.z);
      else
         sWaterCoverage = 1;

      sWaterViscosity = wb->getViscosity();
      sWaterDensity   = wb->getDensity();
      sWaterHeight    = wb->getSurfaceHeight();
   }

to

if (wbox.isOverlapped(sbox)) {
      sWaterType = wb->getLiquidType();
	  sWaterHeight = wb->getCenter();

	  if(sbox.min.z < sWaterHeight)
		sWaterCoverage = (sWaterHeight - sbox.min.z) / sbox.len_z();
   }

and in terrain/waterblock.h I added this single line almost at the bottom of the file:

virtual void updateReflection();
   virtual void inspectPostApply();

   [b]F32 getCenter ( void ) { return mObjToWorld.getPosition().z; }[/b]

   DECLARE_CONOBJECT(WaterBlock);

Enjoy!