• Register

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

  • View media
  • View media
  • View media
  • View media
  • View media
  • View media
Post article RSS Articles

ZombieSoup - Tutorial #01 (Unreal Engine)

Client Side Coding Tutorial


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.



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.



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.


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)

LunarShuriken - - 1,293 comments

Very interesting read, thank you!

Reply Good karma Bad karma+1 vote
Post a comment
Sign in or join with:

Only registered members can share their thoughts. So come on! Join the community today (totally free - or sign in with your social account on the right) and join in the conversation.


Latest posts from @zombiesoupgame

RT @AstrolabeGameJP: ことし7月21日~7月23日、上海有名のオフラインイベント「BilibiliWorld」、四つタイトル出展決定、楽しみですわ~ ミスタークーのいろいろ@mistercoo_game Bit.lyT.co

Jun 24 2023

Youtube.com The stream is going to start soon.

Jun 8 2023

RT @_Rlyeh: 【キュレーター投稿】ゾンビスープ 大学生の主人公はバックパッカー ふと立ち寄った駅でゾンビとの闘いが始まる Store.steampowered.com #Steam #zombiesoup #ゾンビスープ @zombiesoupgame

Jun 8 2023

RT @_Rlyeh: ゾンビシューターというと陰鬱な物が多いが こちらの作品は全体的にポップ 通常のハンドガンだと地味に見えるかもしれないが 特殊武器は派手派手で楽しい! #zombiesoup #ゾンビスープ @zombiesoupgame T.co

Jun 8 2023

RT @IGSpotlights: Zombie Soup - @zombiesoupgame from dev AeonSparx Interactive arrives on #Steam, #PlayStation, #Xbox &… T.co

Jun 7 2023

Hello everyone! Today, the early access of "Zombie Soup" is available now! Thank you for your continuous support… T.co

Jun 7 2023

Youtube.com On June 8, Dengeki Online will boradcast Zombie Soup on their official Youtube channel. #indiegame #Steam #gamedev

Jun 6 2023

RT @HeinyReimes: "Reminds me of Jimmy Neutron, but waaay better!" #indiegame @zombiesoupgame is a top-down shooter combined with ha… T.co

May 31 2023