ZombieSoup is an action top-down shooter following the fate of a kid to shoot, loot and dodge tool his way to save a girl from the danger of zombies, monsters, robot and evil genius. You are Ricky, a college kid on backpack seeking his own adventures out in the country. On an ordinary night Ricky woke up on a long journey to a small town. Soon he discovered that the town has been infested by zombies and monsters. Rogue-like top-down shooter Weapons, both melee and ranged Human & Zombie form Secret paths, levels, loots & unlockables Over 50+ challenging levels Story Mode Survival Mode 80’s Aesthetic

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ZombieSoup - Tutorial #01 (Unreal Engine)

Client Side Coding Tutorial

Introduction

As per in the developed game ZombieSoup, it is supposed to be a top down third-person view angle but due to design constraint, it has a twist is that the floor plane is not normal to the camera angle, which means it's not a 90' degree straight view like an usual 2D game does. The problem adds on that perspective view is used instead of orthographic that causes distortions in space that results in the distance like feeling. In ZombieSoup, the camera angle used has a 10' degree offset from the usual normal line from the floor plane. Diagram 1 below shows a sketch of the current scenario. For cursor world location, we used visibility hit result under the cursor which gives us the result of whatever the cursor is pointing in the world space.

Intended View


Problem Statement

On ideal situation, where the character's actor location has the same Z (height) level as the cursor's world location, using the old method to calculate the Z rotation of the player character will not be a problem. However, the problem comes in when there is a height difference. Since we only wants the Z rotation the old calculation will ignore the Z difference. Shown in Diagram 2, you can see what happened to the player's actor location when u transform its Z to the same height as the mouse Z value. As you can see from the spawned particle location based on the player's location and the cursor location, there is an error caused by the non-normal view as the Z height does not go along with the camera's view. However, if you draw a between the two explosion smoke and between player's location and the projectile hit location, we can see that this two lines are perpendicular to each other.

Error


Analysis

From here we can see that the error is caused by the distorted perspective view and the non-normal camera angle. To attempt to fix this, we need to transpose the player's location in relative to the camera viewport as in, the "correct" Z axis movement. Diagram 3 shows an example scenario of what we need to do.

Formula


Solution

Based on Diagram 3, to perform the transpose, we need to find O value. According to the trigonometry formula, we would require 2 variable which are the angle and the A value. Angle can be obtained from the Camera Manager of the controller and the A value can be calculated by the difference between the cursor Z value and the player's location Z value. After performing the calculation, the transpose can be applied to the player's location to achieve as shown in Diagram 4.

Fixed


With this calculation performed, we can dynamically calculate where the player should point to regerdless of the height difference that might be available in the game. The only down side of this approach is that every mouse movement required to go through a formula calculation which may only take a very small amount of processing power that even a calculator can perform in split seconds.

Old Blueprint view

Old Blueprint

New Blueprint view

New Blueprint

By : Alex Chew Hoo Wing (@Aeonsparx)

Comments
LunarShuriken
LunarShuriken

Very interesting read, thank you!

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RT @judocruiseplays: 🚨going live at 6pm EST!!! playing 7 new #indiegames from #SteamGameFestival !!! ⏩http://twitch.tv/judocruise ZOMBIE S… T.co

Apr 15 2021

RT @ChaoticFear19: Our newest video is here! A fun fast pace top down shooter! It's @zombiesoupgame! Youtu.be… T.co

Apr 15 2021

RT @ButtonPushin: In #ZombieSoup you are Ricky and you've just arrived into town and met your dream girl, unfortunately there's a zom… T.co

Feb 5 2021

Our Steam DEMO is now available in conjunction to Steam Festival. Store.steampowered.com Have a taste of our lates… T.co

Feb 4 2021

Hey guys! Our game demo is out in Steam. Download now for free. Store.steampowered.com #Steam T.co

Feb 2 2021

Linkedin.com Zombie Soup has been selected to be in Top 10 of GTR 2020 Conference. T.co

Jan 25 2021

Gngasia.com Hey guys! we are in the running for Level UP KL 2020 awards. Please support us by voting f… T.co

Nov 20 2020

We're excited to announce update v0.1.6.4 of our Demo! Check out the latest version below and let us know what you… T.co

Nov 19 2020

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