minor fixes for Physics 101

Author: BrianWill-Unity

Diff for: Dots101/Physics101/Assets/ActivationPlates/ActivationSystem.cs

@@ -130,6 +130,7 @@ public void OnUpdate(ref SystemState state)
                         if (zone.ValueRO.LastTriggerTime == 0)
                         {
                             spawnBox = true;
+                            zone.ValueRW.LastTriggerTime = (float)elapsedTime;
                         }
                     }
                     else if (type == ZoneType.Continuous && zoneState == ZoneState.Inside)

Diff for: Dots101/Physics101/Assets/Blender/BladeAuthoring.cs

@@ -1,7 +1,6 @@
 using Unity.Entities;
 using Unity.Mathematics;
 using UnityEngine;
-using UnityEngine.Serialization;
 
 namespace Blender
 {

Diff for: Dots101/Physics101/Assets/Blender/BuoyantSystem.cs renamed to Dots101/Physics101/Assets/Blender/BuoyancySystem.cs

@@ -20,8 +20,7 @@ public void OnUpdate(ref SystemState state)
             float deltaTime = SystemAPI.Time.DeltaTime;
 
             foreach (var (buoyant, transform, velocity, mass) in
-                     SystemAPI
-                         .Query<RefRO<Buoyancy>, RefRW<LocalTransform>, RefRW<PhysicsVelocity>, RefRO<PhysicsMass>>())
+                     SystemAPI.Query<RefRO<Buoyancy>, RefRW<LocalTransform>, RefRW<PhysicsVelocity>, RefRO<PhysicsMass>>())
             {
                 float3 currentPos = transform.ValueRW.Position;
 

Diff for: Dots101/Physics101/Assets/Blender/BuoyantSystem.cs.meta renamed to Dots101/Physics101/Assets/Blender/BuoyancySystem.cs.meta

@@ -1,7 +1,6 @@
 using Unity.Burst;
 using Unity.Collections;
 using Unity.Entities;
-using Unity.Mathematics;
 using Unity.Transforms;
 using Random = Unity.Mathematics.Random;
 
@@ -10,11 +9,13 @@ namespace BreakingBricks
     public partial struct BallSystem : ISystem
     {
         private float spawnTimer;
+        private uint seed;
 
         [BurstCompile]
         public void OnCreate(ref SystemState state)
         {
             state.RequireForUpdate<BreakingBricks.Config>();
+            seed = 1;
         }
 
         [BurstCompile]
@@ -29,8 +30,7 @@ public void OnUpdate(ref SystemState state)
 
                 var newBalls =
                     state.EntityManager.Instantiate(config.BallPrefab, config.NumBallsSpawn, Allocator.Temp);
- 
-                var rand = new Random((uint)math.max(1, math.ceil(SystemAPI.Time.ElapsedTime)));
+                var rand = Random.CreateFromIndex(++seed);
 
                 var min = config.SpawnBoundsMin;
                 var max = config.SpawnBoundsMax;

Diff for: Dots101/Physics101/Assets/BreakingBricks/BallSystem.cs

@@ -23,7 +23,7 @@ public void OnCreate(ref SystemState state)
             state.RequireForUpdate<PhysicsWorldSingleton>();
             state.RequireForUpdate<BreakingBricks.Config>();
         }
-
+ 
         [BurstCompile]
         public void OnUpdate(ref SystemState state)
         {

Diff for: Dots101/Physics101/Assets/BreakingBricks/BrickSystem.cs

@@ -31,7 +31,7 @@ public void OnUpdate(ref SystemState state)
                     playerTransform.ValueRW.Position += input * speed;
                 }
             }
-
+            
             float laserLength = 0;
 
             // raycast to determine the laser length