Why does this work - it shouldn't!

I keep looking through the Torque source and finding undeclared variables and functions being used... here's an example:

void Item::renderImage(SceneState* state, SceneRenderImage* image)
{
   // Client side rotation
   if (mRotate) {
      F32 t = Sim::getCurrentTime() * F32(1)/1000;
      F32 r = (t / sRotationSpeed) * M_2PI;
      Point3F pos;
      mRenderObjToWorld.getColumn(3,&pos);
      MatrixF mat = mRenderObjToWorld;
      mat.set(Point3F(0,0,r));
      mat.setColumn(3,pos);
      Parent::setRenderTransform(mat);
   }
   Parent::renderImage(state, image);

   if (mShadow)
   {
      mShadow->setMoving(!mAtRest);
      mShadow->setAnimating(!mAtRest && !mRotate);
   }
}

Looking around, I cannot find anywhere - even with a full project search - that mRenderObjToWorld is declared... same with pos. When I try doing this in my own program, it just complains that neither of those 2 are declared.

So they are not being declared, they aren't in any header files, and they are only being used - but whenever I put them in my program, it causes errors.

What am I missing here? Is Eclipse not finding where they are declared when I do a full project search for mRenderObjToWorld?