hi,
as per me, u have to decide those points whose animation u hv to actually give to ur target, means it must be smwht closer to ur target position whr actually u wanna place the target.
for eg, if u wanna place one hoarding on side of the road, then u hv to giv same animation as road have, so u will take pt smwhr near road or on d road (n remember d point which u take must be clear, n having no such same pixels around it, or else ur track pt. will lost.)
i hope i hd tried to answer ur question ,gud luck, tc.