Survival Game Building Mechanics

Unreal Engine 5 · C++ / BlueprintSolo developer

01Context

A survival construction system built solo in Unreal Engine 5, with a C++ core and a Blueprint interaction layer.

Building systems are deceptively large: the visible part is placing a wall, and the rest is validity, snapping, structural relationships, destruction and persistence. This is the complete loop, implemented as one system.

02My Ownership

System Architecture
C++ core
Interaction Layer
Blueprint
Placement
Preview · Validity
Snapping
Structural Pieces
Foundations · Walls · Floors
Destruction
Persistence
Save / Load
UI

03Engineering Scope

A C++ core with a Blueprint interaction layer, the split that keeps iteration fast without putting the rules in Blueprint.

Gathering and selection

Resource gathering
Build book
UI

Placement

Placement preview
Placement and validity rules
Snapping
Rotation

Structures

Foundations
Walls
Floors
Destruction

State

Persistence
Save and load

04Construction Loop

System view / portfolio visualization: a conceptual map of how the systems relate, not the production class graph.

Gathering
Build Book
Placement Preview
Validity / Snapping
Construction
Structure State

Supporting services

Destruction
Persistence
UI

05Core in C++, Interaction in Blueprint

The system is split deliberately: the rules (validity, snapping, structural relationships and persistence) live in the C++ core, while the interaction layer sits in Blueprint. That keeps the parts that must be correct out of a visual graph, and the parts that need constant iteration easy to change.

The build loop is continuous rather than a set of separate features. Gathering feeds the build book, the book drives a placement preview, the preview resolves against validity and snapping, and what results becomes structure state that can be destroyed and must survive a save and reload.