Method getNormalAndHeight

Engine/source/terrain/terrData.cpp:835–899

}

bool TerrainBlock::getNormalAndHeight( const Point2F &pos, Point3F *normal, F32 *height, bool normalize ) const
{
	PROFILE_SCOPE( TerrainBlock_getNormalAndHeight );

   F32 invSquareSize = 1.0f / mSquareSize;
   F32 xp = pos.x * invSquareSize;
   F32 yp = pos.y * invSquareSize;
   S32 x = S32(xp);
   S32 y = S32(yp);
   xp -= (F32)x;
   yp -= (F32)y;

   const U32 blockMask = mFile->mSize - 1;

   if ( x & ~blockMask || y & ~blockMask )
      return false;
   
   x &= blockMask;
   y &= blockMask;
   
   const TerrainSquare *sq = mFile->findSquare( 0, x, y );
   if ( sq->flags & TerrainSquare::Empty )
      return false;

   F32 zBottomLeft  = fixedToFloat( mFile->getHeight(x, y) );
   F32 zBottomRight = fixedToFloat( mFile->getHeight(x + 1, y) );
   F32 zTopLeft     = fixedToFloat( mFile->getHeight(x, y + 1) );
   F32 zTopRight    = fixedToFloat( mFile->getHeight(x + 1, y + 1) );

   if ( sq->flags & TerrainSquare::Split45 )
   {
      if (xp>yp)
      {
         // bottom half
         normal->set(zBottomLeft-zBottomRight, zBottomRight-zTopRight, mSquareSize);
         *height = zBottomLeft + xp * (zBottomRight-zBottomLeft) + yp * (zTopRight-zBottomRight);
      }
      else
      {
         // top half
         normal->set(zTopLeft-zTopRight, zBottomLeft-zTopLeft, mSquareSize);
         *height = zBottomLeft + xp * (zTopRight-zTopLeft) + yp * (zTopLeft-zBottomLeft);
      }
   }
   else
   {
      if (1.0f-xp>yp)
      {
         // bottom half
         normal->set(zBottomLeft-zBottomRight, zBottomLeft-zTopLeft, mSquareSize);
         *height = zBottomRight + (1.0f-xp) * (zBottomLeft-zBottomRight) + yp * (zTopLeft-zBottomLeft);
      }
      else
      {
         // top half
         normal->set(zTopLeft-zTopRight, zBottomRight-zTopRight, mSquareSize);
         *height = zBottomRight + (1.0f-xp) * (zTopLeft-zTopRight) + yp * (zTopRight-zBottomRight);
      }