Before we start, I just want to say I have a basic video guide I wrote previously for item jumping which works with 90% of mid item jumps as long as you place the item in the right place. Test in single player!
Basic video guide with text in description: https://www.youtube.com/watch?v=lpjVe0-6vSw
Table of Contents
A) Moving into place
B) Item short Jump without breaking WW
C) Item long jumping
D) Specific jump locations
E) Mechanics
A) Moving into place
1) Right click until you are as close to the two walls as possible
2) If that doesn't work, try repeatedly using the move command on both buildings until you're in place. (M + click building)
3) If that doesn't work, try using a combination of move command on building, then right click into place
B) Item short Jump without breaking WW
- The general consensus to single item jump without breaking WW is by having an item placed as far away as possible from the gap you're jumping, but still on your unit, then picking up the item. Using the move/hold/patrol all work. Note, spells work too, but it breaks your WW.
C) Item long jumping
- To item long jump, you must break WW. You can do this by attacking the item or wall, using a spell (You can even cancel the spell animation), or using an item.
- Item long jumps works exactly like a builder building jump (or wall jumping). The amount of items needed to block off the space is similar to how many units that needs to be blocked in order to building jump. The only difference is that the titan is a larger 1.5 units squared (1.5x1.5), and the builder is 1 units squared (1x1). This allows the titan to jump into most tower bases, and able to jump into the back of other bases.
D) Specific jump locations
For this particular item jump it's got very weird autopathing caused by slope, so I wrote a specific guide for it(WITH PICTURES!):
Spoiler!
E) Mechanics
- The reason why you can jump is because windwalked units collides and can not walk over items. Since an item is dropped after you have already moved there, and if you try to use a command like picking the item up or moving (short item jumps) or break WW in any way (long item jumping), the game engine tries to place your unit where it is not colliding with another item on the same terrain level, which makes you jump, allowing you to even jump inside bases.
- The reason why sometimes you can't move to where you want to go is because of WC3's famous autopathing, where it tries to go another route to get to the desired location due to slopes. Otherwise, it's usually okay, as long as you don't click too far over the gap, or onto the building.
-Burn