Blueless

• Overview
• Download
• Before You Start
• Technical Info
• Highlights
  • Technical
  • Gameplay
  • Controls
  • Useful Patterns

Overview

This sample is provided with full source code and demonstrates how Quantum can be used to create a fast and action-packed online 2D platform shooter.

Disclaimer: The sample game was developed by BitCake Studio for Photon Engine.

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Download

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Before You Start

To run the sample in online multiplayer mode, first create a Quantum AppId in the PhotonEngine Dashboard and paste it into the AppId field in PhotonServerSettings asset. Then load the Menu scene in the Scenes menu and press Play.

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Technical Info

• Unity: 2020.3.20f1.
• Platforms: PC (Windows / Mac), WebGL and Mobile (Android)

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Highlights

Technical

• Character Controller 3D with custom steering implementation.
• Raycast projectiles based on delta-movement.
• Data-Driven Polymorphism.
• Respawn Points with Entity Prototypes.
• Disconnect System for inactive players.

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Gameplay

• Fast paced, 2D platform shooter.
• Double jump.
• Area damage.
• Grenade.
• Weapon reload time.
• Change weapon using weapon inventory.

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Controls

Use A S to movement, Space to jump, Q E to change weapon, F to use the granade, Left Mouse Button to shoot and use the mouse cursor to aim.

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Useful Patterns

Raycast Projectiles Based On Delta-movement

This is a good approach to prevent fast bullets from crossing walls. A raycast based on direction and speed is used to predict the next bullet movement and detect a hit, if any.

Physics2D.HitCollection hits = frame.Physics2D.LinecastAll(bulletTransform->Position, futurePosition);
for (int i = 0; i < hits.Count; i++)
{
  var entity = hits[i].Entity;
  ...
  if (entity == EntityRef.None)
  {
    bulletTransform->Position = hits[i].Point;
    // Applies polymorphic behavior on the bullet action
    data.BulletAction(frame, bullet, EntityRef.None);
    return true;
  }
}

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Disconnect System

Using the deterministicinputflags we check if the player is present. So, the entities of players who are not present for a while are removed from the simulation.

public override void Update(Frame frame)
{
  frame.Global->DisconnectTime += frame.DeltaTime;

  var robotsFilter = frame.Filter<PlayerID, Status>();
  while (robotsFilter.NextUnsafe(out var robot, out var playerID, out var robotStatus))
  {
    DeterministicInputFlags flags = frame.GetPlayerInputFlags(playerID->PlayerRef);

    if ((flags & DeterministicInputFlags.PlayerNotPresent) == DeterministicInputFlags.PlayerNotPresent)
    {
      robotStatus->DisconnectedTicks++;
    }
    else
    {
      robotStatus->DisconnectedTicks = 0;
    }
    if (robotStatus->DisconnectedTicks >= 15)
    {
      frame.Destroy(robot);
    }
  }
}

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