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/usr/src/castle-game-engine-4.1.1/base/castlevectors_vector3fromstr.inc is in castle-game-engine-src 4.1.1-1.

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var
  SPosition: Integer;
begin
  SPosition := 1;
  result[0] := StrToFloat(NextToken(S, SPosition));
  result[1] := StrToFloat(NextToken(S, SPosition));
  result[2] := StrToFloat(NextToken(S, SPosition));
  if NextToken(S, SPosition) <> '' then
    raise EConvertError.Create('Expected end of data when reading vector from string');

  { This could also be implemented by DeFormat, but this is faster
    (which is important for e.g. reading 3D data where this function may be used
    often) }
end;