tank documentary: http://www.guba.com/watch/3000084267?category_id=527&duration_step=0&filter_tiny=0&pp=40&sb=5&set=-1&sf=0&size_step=0&o=34&sample=1211338339:2b6e1363602c2b690bfd1a317413520274515f4e part2:…
Try using this mel script. To use it select the branch followed by the trunk, then run the script. You'll want to have the pivot point of the branch set at its base. geometryConstraint -weight 1;normalConstraint -weight 1 -aimVector 0 1 0 -upVector 0 1 0 -worldUpType "vector" -worldUpVector 0 1 0;