Azerothcore-wotlk: NPCs falling through the ground

[ghost]

Description:
Sometimes NPCs fall through the ground while attacking.

Current behaviour:
When attacking NPCs which are moving over a hill, they sometimes fall through the ground and attack you from below.

Expected behaviour:
The NPCs should just run/walk normally above the ground.

Steps to reproduce the problem:
Example:
Teleport to the following location:
.go xyz -3067.45 -4308.53 0.300854 1
Attack the Defias Rummager on the other side of the small hill and pull him on top of the hill. He will fall through the ground.

I don't know if it is related, but sometimes NPCs with waypoint or random movement "float" or "hop" to their destination when running up or down a hill.

Branch(es): master

AC hash/commit: https://github.com/azerothcore/azerothcore-wotlk/commit/8481eec5beac5a2e65052f95a6ff6aa22c5db981

Operating system: Ubuntu 16.04

Modules:
https://github.com/azerothcore/mod-transmog
https://github.com/azerothcore/mod-npcbeastmaster
https://github.com/azerothcore/mod-vas-autobalance

Other Customizations: none

[BarbzYHOOL]

Same happens with your pet, it's for all mobs. It's probably a mmap problem

[Nefertumm]

This maybe is related with #862.

[FALL1N1]

bad mmaps, edges aren't calculated properly, you can see with .mmap path that the path is ok-ish till it reaches edges or road bumps like rocks, fences etc

[FALL1N1]

Alright, so i did some testing and with stock trinity mmaps everything looks ok. http://prntscr.com/jugb3s

https://mega.nz/#!28ZEkI5Q!x4wIJ9Z4G63g098H9kcDzfuBWcC-sbe030hhlaowJnc try with these mmaps (this contains just the small isle of STV, not the entire game), test and let me know if it works

[ghost]

I tried to identify the essential changes Trinitycore did to the tools and aggregated them into PR #926.