Probably fixed all the jittering, won't need the jitter guard anymore.

resources/Schema/Components/Collidable.xml

@@ -1,4 +1,3 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
 <Collidable xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="Collidable.xsd">
-	<JitterGuard>true</JitterGuard>
 </Collidable>

resources/Schema/Components/Collidable.xsd

@@ -7,10 +7,5 @@
 		<xs:annotation>
 			<xs:documentation>Needs a Model or AABB component to work, uses AABB if both are attached.</xs:documentation>
 		</xs:annotation>
-		<xs:complexType>
-			<xs:all>
-				<xs:element name="JitterGuard" type="t:bool" minOccurs="0"/>
-			</xs:all>
-		</xs:complexType>
 	</xs:element>
 </xs:schema>

src/Engine/Collision/Collision.cpp

@@ -470,6 +470,7 @@ bool AABBvsTriangle(const AABB& box,
     }
 
     glm::vec3 cornerResolution = (1+t) * diagonal;
+    cornerResolution = glm::dot(cornerResolution, triNormal) * triNormal;
     //Overwrite the smallest resolution if cornerResolution is smaller.
     float lenSq = glm::length2(cornerResolution);
     if (lenSq < resolveShortest.DistanceSq) {

src/Engine/Collision/CollisionSystem.cpp

@@ -66,7 +66,7 @@ void CollisionSystem::UpdateComponent(EntityWrapper& entity, ComponentWrapper& c
                 }
             }
         }
-        bool& jitterGuard = (bool&)entity["Collidable"]["JitterGuard"];
+
         // Collide against octree items
         m_OctreeResult.clear();
         m_Octree->ObjectsInSameRegion(*boundingBox, m_OctreeResult);
@@ -88,12 +88,11 @@ void CollisionSystem::UpdateComponent(EntityWrapper& entity, ComponentWrapper& c
                 glm::mat4 modelMatrix = Transform::ModelMatrix(boxB.Entity);
 
                 glm::vec3 inOutVelocity = (glm::vec3)cPhysics["Velocity"];
-                bool notMovingxz = glm::all(glm::lessThan(glm::abs(glm::vec2(inOutVelocity.x, inOutVelocity.z)), glm::vec2(0.01f))) && prevPosIt != m_PrevPositions.end();
                 bool isOnGround = (bool)cPhysics["IsOnGround"];
                 float verticalStepHeight = (float)(double)cPhysics["VerticalStepHeight"];
                 if (Collision::AABBvsTriangles(boxA, model->Vertices(), model->m_Indices, modelMatrix, inOutVelocity, verticalStepHeight, isOnGround, resolutionVector)) {
                     //Move the position to previous position if it is not moving in the xz-plane, else resolve with the resolution vector.
-                    (glm::vec3&)cTransform["Position"] += jitterGuard && notMovingxz ? prevPosIt->second - boxA.Origin() : resolutionVector;
+                    (glm::vec3&)cTransform["Position"] += resolutionVector;
                     boxA = *Collision::EntityAbsoluteAABB(entity);
                     cPhysics["Velocity"] = inOutVelocity;
                     if (isOnGround) {
@@ -118,7 +117,6 @@ void CollisionSystem::UpdateComponent(EntityWrapper& entity, ComponentWrapper& c
             (bool)cPhysics["IsOnGround"] = false;
         }
 
-        jitterGuard = true;
         m_PrevPositions[entity] = boxA.Origin();
     }
 }

src/Game/Systems/PlayerMovementSystem.cpp

@@ -273,14 +273,10 @@ void PlayerMovementSystem::updateMovementControllers(double dt)
                     size = glm::vec3(1.f, 1.f, 1.f);
                 } else {
                     size = glm::vec3(1.f, 1.6f, 1.f);
-                    if (controller->CrouchingLastFrame() && player.HasComponent("Collidable")) {
+                    if (controller->CrouchingLastFrame() && isOnGround) {
-                        // Disable jitter guard so player doesn't get stuck in the ground.
+                        // The collision should resolve this anyway, but 
-                        (bool&)player["Collidable"]["JitterGuard"] = false;
+                        // this is more reliable, since the box gets larger.
-                        if (isOnGround) {
+                        ((glm::vec3&)cTransform["Position"]).y += 0.3f;
-                            // The collision should resolve this anyway, but 
-                            // this is more reliable, since the box gets larger.
-                            ((glm::vec3&)cTransform["Position"]).y += 0.3f;
-                        }
                     }
                 }
             }