public override PhysicsActor AddAvatar(string avName, Vector3 position, Vector3 size, bool isFlying)
{
POSCharacter act = new POSCharacter();
act.Position = position;
act.Flying = isFlying;
_characters.Add(act);
return act;
}
public override void RemoveAvatar(PhysicsActor character)
{
POSCharacter act = (POSCharacter)character;
if (_characters.Contains(act))
{
_characters.Remove(act);
}
}
public override PhysicsActor AddAvatar(string avName, Vector3 position, Vector3 size, bool isFlying)
{
POSCharacter act = new POSCharacter();
act.Position = position;
act.Flying = isFlying;
_characters.Add(act);
return(act);
}
private bool isColliding(POSCharacter c, POSPrim p)
{
Vector3 rotatedPos = new Vector3(c.Position.X - p.Position.X, c.Position.Y - p.Position.Y,
c.Position.Z - p.Position.Z) * Quaternion.Inverse(p.Orientation);
Vector3 avatarSize = new Vector3(c.Size.X, c.Size.Y, c.Size.Z) * Quaternion.Inverse(p.Orientation);
return(Math.Abs(rotatedPos.X) < (p.Size.X * 0.5 + Math.Abs(avatarSize.X)) &&
Math.Abs(rotatedPos.Y) < (p.Size.Y * 0.5 + Math.Abs(avatarSize.Y)) &&
Math.Abs(rotatedPos.Z) < (p.Size.Z * 0.5 + Math.Abs(avatarSize.Z)));
}
private bool isCollidingWithPrim(POSCharacter c)
{
foreach (POSPrim p in _prims)
{
if (isColliding(c, p))
{
return(true);
}
}
return(false);
}
private bool isCollidingWithPrim(POSCharacter c)
{
for (int i = 0; i < _prims.Count; ++i)
{
if (isColliding(c, _prims[i]))
{
return(true);
}
}
return(false);
}
public override float Simulate(float timeStep)
{
float fps = 0;
for (int i = 0; i < _characters.Count; ++i)
{
fps++;
POSCharacter character = _characters[i];
float oldposX = character.Position.X;
float oldposY = character.Position.Y;
float oldposZ = character.Position.Z;
if (!character.Flying)
{
character._target_velocity.Z += gravity * timeStep;
}
Vector3 characterPosition = character.Position;
characterPosition.X += character._target_velocity.X * timeStep;
characterPosition.Y += character._target_velocity.Y * timeStep;
characterPosition.X = Util.Clamp(character.Position.X, 0.01f, Constants.RegionSize - 0.01f);
characterPosition.Y = Util.Clamp(character.Position.Y, 0.01f, Constants.RegionSize - 0.01f);
bool forcedZ = false;
float terrainheight = _heightMap[(int)character.Position.Y * Constants.RegionSize + (int)character.Position.X];
if (character.Position.Z + (character._target_velocity.Z * timeStep) < terrainheight + 2)
{
characterPosition.Z = terrainheight + character.Size.Z;
forcedZ = true;
}
else
{
characterPosition.Z += character._target_velocity.Z * timeStep;
}
/// this is it -- the magic you've all been waiting for! Ladies and gentlemen --
/// Completely Bogus Collision Detection!!!
/// better known as the CBCD algorithm
if (isCollidingWithPrim(character))
{
characterPosition.Z = oldposZ; // first try Z axis
if (isCollidingWithPrim(character))
{
characterPosition.Z = oldposZ + character.Size.Z / 4.4f; // try harder
if (isCollidingWithPrim(character))
{
characterPosition.Z = oldposZ + character.Size.Z / 2.2f; // try very hard
if (isCollidingWithPrim(character))
{
characterPosition.X = oldposX;
characterPosition.Y = oldposY;
characterPosition.Z = oldposZ;
characterPosition.X += character._target_velocity.X * timeStep;
if (isCollidingWithPrim(character))
{
characterPosition.X = oldposX;
}
characterPosition.Y += character._target_velocity.Y * timeStep;
if (isCollidingWithPrim(character))
{
characterPosition.Y = oldposY;
}
}
else
{
forcedZ = true;
}
}
else
{
forcedZ = true;
}
}
else
{
forcedZ = true;
}
}
characterPosition.X = Util.Clamp(character.Position.X, 0.01f, Constants.RegionSize - 0.01f);
characterPosition.Y = Util.Clamp(character.Position.Y, 0.01f, Constants.RegionSize - 0.01f);
character.Position = characterPosition;
character._velocity.X = (character.Position.X - oldposX) / timeStep;
character._velocity.Y = (character.Position.Y - oldposY) / timeStep;
if (forcedZ)
{
character._velocity.Z = 0;
character._target_velocity.Z = 0;
((PhysicsActor)character).IsColliding = true;
character.RequestPhysicsterseUpdate();
}
else
{
((PhysicsActor)character).IsColliding = false;
character._velocity.Z = (character.Position.Z - oldposZ) / timeStep;
}
}
return(fps);
}
private bool isCollidingWithPrim(POSCharacter c)
{
foreach (POSPrim p in _prims)
{
if (isColliding(c, p))
{
return true;
}
}
return false;
}
private bool isColliding(POSCharacter c, POSPrim p)
{
Vector3 rotatedPos = new Vector3(c.Position.X - p.Position.X, c.Position.Y - p.Position.Y,
c.Position.Z - p.Position.Z) * Quaternion.Inverse(p.Orientation);
Vector3 avatarSize = new Vector3(c.Size.X, c.Size.Y, c.Size.Z) * Quaternion.Inverse(p.Orientation);
return (Math.Abs(rotatedPos.X) < (p.Size.X*0.5 + Math.Abs(avatarSize.X)) &&
Math.Abs(rotatedPos.Y) < (p.Size.Y*0.5 + Math.Abs(avatarSize.Y)) &&
Math.Abs(rotatedPos.Z) < (p.Size.Z*0.5 + Math.Abs(avatarSize.Z)));
}
private bool isCollidingWithPrim(POSCharacter c)
{
for (int i = 0; i < _prims.Count; ++i)
{
if (isColliding(c, _prims[i]))
{
return true;
}
}
return false;
}
private bool isColliding(POSCharacter c, POSPrim p)
{
Vector3 rotatedPos = new Vector3(c.Position.X - p.Position.X, c.Position.Y - p.Position.Y,
c.Position.Z - p.Position.Z) * Quaternion.Inverse(p.Orientation);
Vector3 avatarSize = new Vector3(c.Size.X, c.Size.Y, c.Size.Z) * Quaternion.Inverse(p.Orientation);
if (Math.Abs(rotatedPos.X) >= (p.Size.X*0.5 + Math.Abs(avatarSize.X)) ||
Math.Abs(rotatedPos.Y) >= (p.Size.Y*0.5 + Math.Abs(avatarSize.Y)) ||
Math.Abs(rotatedPos.Z) >= (p.Size.Z*0.5 + Math.Abs(avatarSize.Z)))
{
return false;
}
return true;
}
