3D Game Development

• Coded in C++ and used SDL2 library for the Game development
• Implemented 3D collision detection system.
• Implemented basic player movement.
• Applied the concept of Quaternion to solve the complicated FPS rotation and Camera Vision
• Focus on Portal Teleportation and Damage Mechanism
• Coded 3D Sound System and HUD for Game leading
• Created Enemy AI with a State Machine involving 5 states

• Implemented classes for HUD game substitles and voice guidline
• Complete level loading mechanics
• Use matrix transformation to transform between object’s relative position and world position
• Use mouse input from the SDL class and concepts of yaw, pitch to implement FPS camera

• Turrets and laser shooting
• Applied linear segment cast for lasers to determine target within range.
• Used actor parenting between the TurretHead and the TurretBase

• Implemented function of clicking LMB creates portal and clicking RMB makes orange portal.

• Implemented diffrent actor subclasses for diffrent in-game obejects and functionalities
  • energy catcher
  • energy launcher
  • pellet
  • energy glass
  • energy cube

• Applied the transformations to fix the player’s yaw after portal teleportation

Detailed Code for Transformation

### Code for fixing player's position ```C++ playertoIn.Normalize(); //Get the inverse world transform matrix of the “in” portal. Matrix4 inverseWorldTransform = GetWorldTransform(); inverseWorldTransform.Invert(); //Use Vector3::Transform to transform (1) by (2), making sure to pass in 0.0f for the third parameter. Vector3 outDir = Vector3::Transform(playertoIn, inverseWorldTransform, 0.0f); //Create a Z rotation matrix rotating by Math::Pi Matrix4 zRotation = Matrix4::CreateRotationZ(Math::Pi); Vector3 outDirRotated = Vector3::Transform(outDir, zRotation, 0.0f); Vector3 outDirInWorld = Vector3::Transform(outDirRotated, outportal->GetWorldTransform(), 0.0f); outDirInWorld.Normalize(); Vector3 eyepos = outportal->GetPosition() - 5.0f * outDirInWorld; Vector3 targetpos = outportal->GetPosition() + 5.0f * outDirInWorld; Matrix4 worldTransform = outportal->GetWorldTransform(); Vector3 up = worldTransform.GetZAxis(); mPortalViewMatrix = Matrix4::CreateLookAt(eyepos, targetpos, up); // outforward should not be the forward of the portal, instead, it should come from the calculation process that we just did Vector3 outForward = outDirInWorld; outForward.z = 0.0f; outForward.Normalize(); float yaw = Math::Acos(Vector3::Dot(Vector3::UnitX, outForward)); if (Vector3::Cross(outForward, Vector3::UnitX).z > 0.0f) { yaw *= -1.0f; } mOutYaw = yaw; return mPortalViewMatrix; ```

For complete code, please click this Link to the Portal Game on my GitHub