From ac0cf0140480ea3c6e57c544ef73795aa4143a2a Mon Sep 17 00:00:00 2001
From: Ruan Lucas <79365912+RuanLucasGD@users.noreply.github.com>
Date: Sat, 3 Jun 2023 13:25:29 -0400
Subject: [PATCH] add simple linecast to physics

---
 Source/Engine/Physics/Physics.cpp    | 12 ++++++++++++
 Source/Engine/Physics/Physics.h      | 10 ++++++++++
 Source/Engine/Physics/PhysicsScene.h | 10 ++++++++++
 3 files changed, 32 insertions(+)

diff --git a/Source/Engine/Physics/Physics.cpp b/Source/Engine/Physics/Physics.cpp
index 0a0178622..80f17873d 100644
--- a/Source/Engine/Physics/Physics.cpp
+++ b/Source/Engine/Physics/Physics.cpp
@@ -218,6 +218,11 @@ void Physics::FlushRequests()
     PhysicsBackend::FlushRequests();
 }
 
+bool Physics::LineCast(const Vector3& start, const Vector3& end, uint32 layerMask, bool hitTriggers)
+{
+    return DefaultScene->LineCast(start, end, layerMask, hitTriggers);
+}
+
 bool Physics::RayCast(const Vector3& origin, const Vector3& direction, const float maxDistance, uint32 layerMask, bool hitTriggers)
 {
     return DefaultScene->RayCast(origin, direction, maxDistance, layerMask, hitTriggers);
@@ -450,6 +455,13 @@ void PhysicsScene::CollectResults()
     _isDuringSimulation = false;
 }
 
+bool PhysicsScene::LineCast(const Vector3& start, const Vector3& end, uint32 layerMask, bool hitTriggers)
+{
+    float distanceToEnd = Vector3::Distance(start, end);
+    Vector3 directionToEnd = (end - start).GetNormalized();
+    return PhysicsBackend::RayCast(_scene, start, directionToEnd, distanceToEnd, layerMask, hitTriggers);
+}
+
 bool PhysicsScene::RayCast(const Vector3& origin, const Vector3& direction, const float maxDistance, uint32 layerMask, bool hitTriggers)
 {
     return PhysicsBackend::RayCast(_scene, origin, direction, maxDistance, layerMask, hitTriggers);
diff --git a/Source/Engine/Physics/Physics.h b/Source/Engine/Physics/Physics.h
index 62344e082..592f3c651 100644
--- a/Source/Engine/Physics/Physics.h
+++ b/Source/Engine/Physics/Physics.h
@@ -95,6 +95,16 @@ public:
     API_FUNCTION() static void FlushRequests();
 
 public:
+    /// <summary>
+    /// Performs a line between two points in the scene.
+    /// </summary>
+    /// <param name="start">The start position of the line.</param>
+    /// <param name="end">The end position of the line.</param>
+    /// <param name="layerMask">The layer mask used to filter the results.</param>
+    /// <param name="hitTriggers">If set to <c>true</c> triggers will be hit, otherwise will skip them.</param>
+    /// <returns>True if ray hits an matching object, otherwise false.</returns>
+    API_FUNCTION() static bool LineCast(const Vector3& start, const Vector3& end, uint32 layerMask = MAX_uint32, bool hitTriggers = true);
+
     /// <summary>
     /// Performs a raycast against objects in the scene.
     /// </summary>
diff --git a/Source/Engine/Physics/PhysicsScene.h b/Source/Engine/Physics/PhysicsScene.h
index 6b5ab41ab..946c35661 100644
--- a/Source/Engine/Physics/PhysicsScene.h
+++ b/Source/Engine/Physics/PhysicsScene.h
@@ -126,6 +126,16 @@ public:
     API_FUNCTION() void CollectResults();
 
 public:
+
+    /// <summary>
+    /// Performs a line between two points in the scene.
+    /// </summary>
+    /// <param name="start">The start position of the line.</param>
+    /// <param name="end">The end position of the line.</param>
+    /// <param name="layerMask">The layer mask used to filter the results.</param>
+    /// <param name="hitTriggers">If set to <c>true</c> triggers will be hit, otherwise will skip them.</param>
+    /// <returns>True if ray hits an matching object, otherwise false.</returns>
+    API_FUNCTION() bool LineCast(const Vector3& start, const Vector3& end, uint32 layerMask = MAX_uint32, bool hitOnTriggers = true);
     /// <summary>
     /// Performs a raycast against objects in the scene.
     /// </summary>