private void SlideInWorld(SCNVector3 start, SCNVector3 velocity)
{
var maxSlideIteration = 4;
var iteration = 0;
var stop = false;
var replacementPoint = start;
var options = new SCNPhysicsTest()
{
CollisionBitMask = (int)Bitmask.Collision,
SearchMode = SCNPhysicsSearchMode.Closest,
};
while (!stop)
{
var from = SCNMatrix4.Identity;
SimdExtensions.SetPosition(ref from, start);
var to = SCNMatrix4.Identity;
SimdExtensions.SetPosition(ref to, start + velocity);
var contacts = this.PhysicsWorld.ConvexSweepTest(this.characterCollisionShape, from, to, options.Dictionary);
if (contacts.Any())
{
(velocity, start) = this.HandleSlidingAtContact(contacts.FirstOrDefault(), start, velocity);
iteration += 1;
if (velocity.LengthSquared <= (10E-3 * 10E-3) || iteration >= maxSlideIteration)
{
replacementPoint = start;
stop = true;
}
}
else
{
replacementPoint = start + velocity;
stop = true;
}
}
this.characterNode.WorldPosition = replacementPoint - this.collisionShapeOffsetFromModel;
}
public virtual void Update (ISCNSceneRenderer renderer, double timeInSeconds)
{
// delta time since last update
if (Math.Abs (previousUpdateTime) < float.Epsilon)
previousUpdateTime = timeInSeconds;
double deltaTime = Math.Min (Math.Max (1.0 / 60.0, timeInSeconds - previousUpdateTime), 1f);
previousUpdateTime = timeInSeconds;
// Reset some states every frame
maxPenetrationDistance = 0;
positionNeedsAdjustment = false;
SCNVector3 direction = GameView.CurrentDirection;
SCNVector3 initialPosition = Character.Node.Position;
// Move
if (Math.Abs (direction.X) > float.Epsilon && Math.Abs (direction.Z) > float.Epsilon) {
var characterSpeed = (float)deltaTime * CharacterSpeedFactor * .84f;
Character.Node.Position = new SCNVector3 (
initialPosition.X + direction.X * characterSpeed,
initialPosition.Y + direction.Y * characterSpeed,
initialPosition.Z + direction.Z * characterSpeed
);
// update orientation
double angle = Math.Atan2 (direction.X, direction.Z);
Character.Direction = (float)angle;
Character.Walking = true;
} else {
Character.Walking = false;
}
var p0 = Character.Node.Position;
var p1 = Character.Node.Position;
p0.Y -= MaxJump;
p1.Y += MaxRise;
var options = new SCNPhysicsTest {
CollisionBitMask = (nuint)(int)(Bitmask.Collision | Bitmask.Water),
SearchMode = SCNPhysicsSearchMode.Closest
};
SCNHitTestResult[] results = GameView.Scene.PhysicsWorld.RayTestWithSegmentFromPoint (p1, p0, options);
float groundY = -10;
if (results.Length > 0) {
SCNHitTestResult result = results [0];
groundY = result.WorldCoordinates.Y;
UpdateCameraWithCurrentGround (result.Node);
SCNMaterial groundMaterial = result.Node.ChildNodes [0].Geometry.FirstMaterial;
if (grassArea == groundMaterial) {
Character.CurrentFloorMaterial = FloorMaterial.Grass;
} else if (waterArea == groundMaterial) {
if (Character.Burning) {
Character.Pshhhh ();
Character.Node.RunAction (SCNAction.Sequence (new [] {
SCNAction.PlayAudioSource (pshhhSound, true),
SCNAction.PlayAudioSource (aahSound, false)
}));
}
Character.CurrentFloorMaterial = FloorMaterial.Water;
options = new SCNPhysicsTest {
CollisionBitMask = (nuint)(int)Bitmask.Collision,
SearchMode = SCNPhysicsSearchMode.Closest
};
results = GameView.Scene.PhysicsWorld.RayTestWithSegmentFromPoint (p1, p0, options);
result = results [0];
groundY = result.WorldCoordinates.Y;
} else {
Character.CurrentFloorMaterial = FloorMaterial.Rock;
}
}
// var nextPosition = Character.Node.Position;
// const double threshold = 1e-5;
//
// if (groundY < nextPosition.Y - threshold) {
// // approximation of acceleration for a delta time
// accelerationY += (float)(deltaTime * GravityAcceleration);
// if (groundY < nextPosition.Y - 0.2)
// Character.CurrentFloorMaterial = FloorMaterial.Air;
// } else {
// accelerationY = 0;
// }
//
// nextPosition.Y -= accelerationY;
//
// // reset acceleration if we touch the ground
// if (groundY > nextPosition.Y) {
// accelerationY = 0;
// nextPosition.Y = groundY;
// }
// Flames are static physics bodies, but they are moved by an action - So we need to tell the physics engine that the transforms did change.
foreach (SCNNode flame in flames)
flame.PhysicsBody.ResetTransform ();
// Adjust the volume of the enemy based on the distance with the character.
float distanceToClosestEnemy = float.MaxValue;
SCNVector3 pos3 = Character.Node.Position;
foreach (SCNNode enemy in enemies) {
// distance to enemy
SCNMatrix4 enemyMat = enemy.WorldTransform;
var enemyPosition = new SCNVector3 (enemyMat.M41, enemyMat.M42, enemyMat.M43);
float distance = SCNVector3.Subtract (pos3, enemyPosition).Length;
distanceToClosestEnemy = Math.Min (distanceToClosestEnemy, distance);
}
// Adjust sounds volumes based on distance with the enemy.
if (!gameIsComplete) {
double fireVolume = 0.3 * Math.Max (0.0, Math.Min (1.0, 1.0 - (distanceToClosestEnemy - 1.2) / 1.6));
var mixerNode = flameThrowerSound.AudioNode as AVAudioMixerNode;
if (mixerNode != null)
mixerNode.Volume = (float)fireVolume;
}
}
public virtual void Update(ISCNSceneRenderer renderer, double timeInSeconds)
{
// delta time since last update
if (Math.Abs(previousUpdateTime) < float.Epsilon)
{
previousUpdateTime = timeInSeconds;
}
double deltaTime = Math.Min(Math.Max(1.0 / 60.0, timeInSeconds - previousUpdateTime), 1f);
previousUpdateTime = timeInSeconds;
// Reset some states every frame
maxPenetrationDistance = 0;
positionNeedsAdjustment = false;
SCNVector3 direction = GameView.CurrentDirection;
SCNVector3 initialPosition = Character.Node.Position;
// Move
if (Math.Abs(direction.X) > float.Epsilon && Math.Abs(direction.Z) > float.Epsilon)
{
var characterSpeed = (float)deltaTime * CharacterSpeedFactor * .84f;
Character.Node.Position = new SCNVector3(
initialPosition.X + direction.X * characterSpeed,
initialPosition.Y + direction.Y * characterSpeed,
initialPosition.Z + direction.Z * characterSpeed
);
// update orientation
double angle = Math.Atan2(direction.X, direction.Z);
Character.Direction = (float)angle;
Character.Walking = true;
}
else
{
Character.Walking = false;
}
var p0 = Character.Node.Position;
var p1 = Character.Node.Position;
p0.Y -= MaxJump;
p1.Y += MaxRise;
var options = new SCNPhysicsTest {
CollisionBitMask = (nuint)(int)(Bitmask.Collision | Bitmask.Water),
SearchMode = SCNPhysicsSearchMode.Closest
};
SCNHitTestResult[] results = GameView.Scene.PhysicsWorld.RayTestWithSegmentFromPoint(p1, p0, options);
float groundY = -10;
if (results.Length > 0)
{
SCNHitTestResult result = results [0];
groundY = result.WorldCoordinates.Y;
UpdateCameraWithCurrentGround(result.Node);
SCNMaterial groundMaterial = result.Node.ChildNodes [0].Geometry.FirstMaterial;
if (grassArea == groundMaterial)
{
Character.CurrentFloorMaterial = FloorMaterial.Grass;
}
else if (waterArea == groundMaterial)
{
if (Character.Burning)
{
Character.Pshhhh();
Character.Node.RunAction(SCNAction.Sequence(new [] {
SCNAction.PlayAudioSource(pshhhSound, true),
SCNAction.PlayAudioSource(aahSound, false)
}));
}
Character.CurrentFloorMaterial = FloorMaterial.Water;
options = new SCNPhysicsTest {
CollisionBitMask = (nuint)(int)Bitmask.Collision,
SearchMode = SCNPhysicsSearchMode.Closest
};
results = GameView.Scene.PhysicsWorld.RayTestWithSegmentFromPoint(p1, p0, options);
result = results [0];
groundY = result.WorldCoordinates.Y;
}
else
{
Character.CurrentFloorMaterial = FloorMaterial.Rock;
}
}
// var nextPosition = Character.Node.Position;
// const double threshold = 1e-5;
//
// if (groundY < nextPosition.Y - threshold) {
// // approximation of acceleration for a delta time
// accelerationY += (float)(deltaTime * GravityAcceleration);
// if (groundY < nextPosition.Y - 0.2)
// Character.CurrentFloorMaterial = FloorMaterial.Air;
// } else {
// accelerationY = 0;
// }
//
// nextPosition.Y -= accelerationY;
//
// // reset acceleration if we touch the ground
// if (groundY > nextPosition.Y) {
// accelerationY = 0;
// nextPosition.Y = groundY;
// }
// Flames are static physics bodies, but they are moved by an action - So we need to tell the physics engine that the transforms did change.
foreach (SCNNode flame in flames)
{
flame.PhysicsBody.ResetTransform();
}
// Adjust the volume of the enemy based on the distance with the character.
float distanceToClosestEnemy = float.MaxValue;
SCNVector3 pos3 = Character.Node.Position;
foreach (SCNNode enemy in enemies)
{
// distance to enemy
SCNMatrix4 enemyMat = enemy.WorldTransform;
var enemyPosition = new SCNVector3(enemyMat.M41, enemyMat.M42, enemyMat.M43);
float distance = SCNVector3.Subtract(pos3, enemyPosition).Length;
distanceToClosestEnemy = Math.Min(distanceToClosestEnemy, distance);
}
// Adjust sounds volumes based on distance with the enemy.
if (!gameIsComplete)
{
double fireVolume = 0.3 * Math.Max(0.0, Math.Min(1.0, 1.0 - (distanceToClosestEnemy - 1.2) / 1.6));
var mixerNode = flameThrowerSound.AudioNode as AVAudioMixerNode;
if (mixerNode != null)
{
mixerNode.Volume = (float)fireVolume;
}
}
}
