A method of video decoding includes receiving a syntax element associated with a current coding block that is partitioned into a first part and a second part along a partition edge for prediction in a geometric partitioning mode. The method further includes determining a weight index at a sample position of the current coding block, and determining a stored motion vector type for a first motion storage unit in a motion field of the current coding block based on a motion index of the first motion storage unit. The method further includes storing the motion field of the current coding block based on the stored motion vector type determined for the first motion storage unit.