z3d engine

Z3D Engine is a fake-3d engine designed for simplicity, efficiency, performance, and ease of use.

Z3D engine provides the following features:

•  position, 
• motion, 
• collision detection, 
• depth sorting/draw order 

for your 2.5D games. 

Suitable for games where you have a static, 3/4 view of the world, where the side and top of objects are visible, like The Legend of Zelda, Double Dragon, River City Ransom, TMNT: The Arcade Game, etc.

In a 2D GameMaker room, x and y coordinates are used for positions in the 2D space. 3D requires a third variable for the third dimension, z. In the Z3D Engine, x and y are used to represent the "floor" plane as viewed from a top-down perspective, from a forced perspective that gives the viewer a full view of one side and top of objects, while z is used for altitude. 

Full documentation
Demo