Remove unnecessary Z-index

app/src/main/java/com/bartlomiejpluta/samplegame/core/world/camera/Camera.java

@@ -17,6 +17,6 @@ public class Camera extends Object {
    public Matrix4f getViewMatrix() {
       return viewMatrix
               .identity()
-              .translate(-position.x, -position.y, -position.z);
+              .translate(-position.x, -position.y, 0);
    }
 }

app/src/main/java/com/bartlomiejpluta/samplegame/core/world/object/Object.java

@@ -3,7 +3,7 @@ package com.bartlomiejpluta.samplegame.core.world.object;
 import lombok.Getter;
 import lombok.Setter;
 import org.joml.Matrix4f;
-import org.joml.Vector3f;
+import org.joml.Vector2f;
 
 import static java.lang.Math.toRadians;
 
@@ -11,78 +11,50 @@ public abstract class Object {
    private final Matrix4f modelMatrix = new Matrix4f();
 
    @Getter
-   protected final Vector3f position = new Vector3f(0, 0, 0);
+   protected final Vector2f position = new Vector2f(0, 0);
 
    @Getter
-   protected final Vector3f rotation = new Vector3f(0, 0, 0);
+   @Setter
+   protected float rotation;
 
    @Getter
    @Setter
    protected float scale = 1.0f;
 
-   public Object setPosition(float x, float y, float z) {
+   public Object setPosition(float x, float y) {
       position.x = x;
       position.y = y;
-      position.z = z;
       return this;
    }
 
-   public Object setPosition(Vector3f position) {
+   public Object setPosition(Vector2f position) {
       this.position.x = position.x;
       this.position.y = position.y;
-      this.position.z = position.z;
       return this;
    }
    
-   public Object movePosition(float x, float y, float z) {
+   public Object movePosition(float x, float y) {
       position.x += x;
       position.y += y;
-      position.z += z;
       return this;
    }
 
-   public Object movePosition(Vector3f position) {
+   public Object movePosition(Vector2f position) {
       this.position.x += position.x;
       this.position.y += position.y;
-      this.position.z += position.z;
       return this;
    }
 
-   public Object setRotation(float x, float y, float z) {
-      rotation.x = x;
-      rotation.y = y;
-      rotation.z = z;
-      return this;
-   }
-
-   public Object setRotation(Vector3f rotation) {
-      this.rotation.x = rotation.x;
-      this.rotation.y = rotation.y;
-      this.rotation.z = rotation.z;
-      return this;
-   }
-
-   public Object moveRotation(float x, float y, float z) {
-      rotation.x += x;
-      rotation.y += y;
-      rotation.z += z;
-      return this;
-   }
-
-   public Object moveRotation(Vector3f rotation) {
-      this.rotation.x += rotation.x;
-      this.rotation.y += rotation.y;
-      this.rotation.z += rotation.z;
+   public Object moveRotation(float rotation) {
+      this.rotation += rotation;
       return this;
    }
    
    public Matrix4f getModelMatrix() {
       return modelMatrix
               .identity()
-              .translate(position)
-              .rotateX((float) toRadians(-rotation.x))
-              .rotateY((float) toRadians(-rotation.y))
-              .rotateZ((float) toRadians(-rotation.z))
+              .translate(position.x, position.y, 0)
+              .rotateZ((float) toRadians(-rotation))
               .scale(scale);
    }
 }

app/src/main/java/com/bartlomiejpluta/samplegame/game/logic/DefaultGameLogic.java

@@ -28,7 +28,7 @@ public class DefaultGameLogic implements GameLogic {
       renderer.init();
 
       sprite = new Sprite();
-      sprite.setPosition(window.getWidth() / 2.0f, window.getHeight() / 2.0f, 0);
+      sprite.setPosition(window.getWidth() / 2.0f, window.getHeight() / 2.0f);
       sprite.setScale(100);
       scene.add(sprite);
    }