1 bool CTERRAIN::MakeTerrainFault( int iSize, int iIterations, int iMinDelta, int iMaxDelta, float fFilter ) 2 { 3   ...... 4   ............. 5   for( iCurrentIteration=0; iCurrentIteration<iIterations; iCurrentIteration++ ) 6   { 7     //calculate the height range (linear interpolation from iMaxDelta to iMinDelta) for this fault-pass 8     iHeight= iMaxDelta - ( ( iMaxDelta-iMinDelta )*iCurrentIteration )/iIterations; 9    10     //pick two points at random from the entire height map11     iRandX1= rand( )%m_iSize;12     iRandZ1= rand( )%m_iSize;13    14     //check to make sure that the points are not the same15     do16     {17       iRandX2= rand( )%m_iSize;18       iRandZ2= rand( )%m_iSize;19     } while ( iRandX2==iRandX1 && iRandZ2==iRandZ1 );20 21    22     //iDirX1, iDirZ1 is a vector going the same direction as the line23     iDirX1= iRandX2-iRandX1;24     iDirZ1= iRandZ2-iRandZ1;25    26     for( z=0; z<m_iSize; z++ )27     {28       for( x=0; x<m_iSize; x++ )29       {30         //iDirX2, iDirZ2 is a vector from iRandX1, iRandZ1 to the current point (in the loop)31         iDirX2= x-iRandX1;32         iDirZ2= z-iRandZ1;33        34         //if the result of ( iDirX2*iDirZ1 - iDirX1*iDirZ2 ) is "up" (above 0),35         //then raise this point by iHeight36         if( ( iDirX2*iDirZ1 - iDirX1*iDirZ2 )>0 )37           fTempBuffer[( z*m_iSize )+x]+= ( float )iHeight;38       }39     }40     //erode terrain41     FilterHeightField( fTempBuffer, fFilter );42   }43   .......44   ..............45   return true;46 }