Battle Royale TopDown

Overview

This sample is provided with full source code and demonstrates how Quantum can be used to create a top-down battle royale game for 32 players.

It showcases the basic features of a battle royale game, such as death zone behavior, inventory, etc.

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Technical Info

• Unity: 2020.3.37f1;
• Platforms: PC (Windows / Mac), and Mobile (Android);

Highlights

Technical

• TopDown Character Controller.
• Raycast projectiles based on delta-movement.
• Respown Points with Entity Prototypes.

Gameplay

• Granade Launcher.
• Custom gravity for 2.5D physics.
• Rocket launcher with Animation Curve acceleration.
• Drop weapon system.
• Battle Royale Death zone.
• Players combat messages.
• UI indicator for the safe zone direction.
• Heal powerup;
• Mobile-ready UI controls.

Controls

Use W A S and D to move, Q, E or Mouse Scroll to change weapons. Stand close to an item until for a few seconds to collect it.

Grenade Launcher

When fired, the launcher instantiates a grenade that behaves as a bouncing physics object capable of overpass low enough obstacles. To achiev this behaviour in a 2D physics-based game, a custom gravity was emulated in combination with a 2.5D Transform.

C#

public override void Update(Frame f, ref Filter filter)
    {
      EntityRef entity = filter.Entity;
      CustomGravity* customGravity = filter.customGravity;
      Transform2DVertical* transformVertical = filter.TransformVertical;
      PhysicsCollider2D* collider = filter.Collider;

      if (customGravity->VerticalSpeed <= 0)
      {
        var distance = transformVertical->Height + FPMath.Abs(customGravity->VerticalSpeed * f.DeltaTime);
        if (transformVertical->Position <= distance - (collider->Shape.Circle.Radius))
        {
          if (customGravity->VerticalSpeed > _bounceThreshold)
          {
            transformVertical->Position = _groundHeight;
            customGravity->Grounded = true;
          }
          else
          {
            customGravity->VerticalSpeed = -customGravity->VerticalSpeed / (1 + _restitution);
          }
        }
        else
        {
          customGravity->Grounded = false;
        }
      }
      else
      {
        customGravity->Grounded = false;
      }
      if (customGravity->Grounded == false)
      {
        transformVertical->Position += (customGravity->VerticalSpeed) * f.DeltaTime;
        customGravity->VerticalSpeed += _gravityForce * f.DeltaTime;
      }
    }

Death Zone

The Death Zone functions like a typical danger zone in a Battle Royale game and has two states: Waiting - where there are no changes in size, but players outside the safe zone will suffer damage, and Zone Shrinking - where the safe zone gradually reduces in size until it reaches a predetermined target size and randomly assigned position.

C#

DeathZoneConfig config = frame.FindAsset<DeathZoneConfig>(Config.Id);
      FP elapsed = config.Timers[Iteration] - ChangeStateDelay;
      FP t = FPMath.Clamp01(elapsed / config.Timers[Iteration]);

      CurrentRadius = FPMath.Lerp(config.Radius[Iteration], TargetRadius, t);
      CurrentCenter = FPVector2.Lerp(InitialIterationCenter, TargetCenter, t);

3rd Party Assets

The Projectiles Sample includes several assets provided courtesy of their respective creators. The full packages can be acquired for your own projects at their respective site:

• Cartoon FX Remaster Free by Jean Moreno
• Toon Shooter Game Kit by Quaternius

IMPORTANT: To use them in a commercial project, it is required to purchase a license from the respective creators.