Method exportHeightMap

Engine/source/terrain/terrExport.cpp:32–91

#ifdef TORQUE_TOOLS

bool TerrainBlock::exportHeightMap( const UTF8 *filePath, const String &format ) const
{

   GBitmap output(   mFile->mSize,
                     mFile->mSize,
                     false,
                     GFXFormatR5G6B5 );

   // First capture the max height... we'll normalize 
   // everything to this value.
   U16 maxHeight = 0;

   Vector<const U16>::iterator iBits = mFile->mHeightMap.begin();
   for ( S32 y = 0; y < mFile->mSize; y++ )
   {
      for ( S32 x = 0; x < mFile->mSize; x++ )
      {
         if ( *iBits > maxHeight )
            maxHeight = *iBits;
         ++iBits;
      }
   }

   // Now write out the map.
   iBits = mFile->mHeightMap.begin();
   U16 *oBits = (U16*)output.getWritableBits();
   for ( S32 y = 0; y < mFile->mSize; y++ )
   {
      for ( S32 x = 0; x < mFile->mSize; x++ )
      {
         // PNG expects big endian.
         U16 height = (U16)( ( (F32)(*iBits) / (F32)maxHeight ) * (F32)U16_MAX );
         *oBits = convertHostToBEndian( height );
         ++oBits;
         ++iBits;
      }
   }

   FileStream stream;
   if ( !stream.open( filePath, Torque::FS::File::Write ) )
   {
      Con::errorf( "TerrainBlock::exportHeightMap() - Error opening file for writing: %s !", filePath );
      return false;
   }

   if ( !output.writeBitmap( format, stream ) )
   {
      Con::errorf( "TerrainBlock::exportHeightMap() - Error writing %s: %s !", format.c_str(), filePath );
      return false;
   }

   // Print out the map size in meters, so that the user 
   // knows what values to use when importing it into 
   // another terrain tool.
   S32 dim = mSquareSize * mFile->mSize;
   S32 height = fixedToFloat( maxHeight );
   Con::printf( "Saved heightmap with dimensions %d x %d x %d.", dim, dim, height );