public void Weld(Prop prop)
{
Host.AssertServer();
if (!prop.IsValid())
{
return;
}
// Don't weld myself to myself, stupid
if (prop == this)
{
return;
}
// Don't weld myself twice, stupid
if (prop.weldParent == this || weldParent == prop)
{
return;
}
// Only allow welding of two root props
if (Parent != null || prop.Parent != null)
{
return;
}
// Only allow welding of props that have physics bodies
if (!PhysicsBody.IsValid() || !prop.PhysicsBody.IsValid())
{
return;
}
// Only allow welding of props that have a single body
if (PhysicsGroup.BodyCount > 1 || prop.PhysicsGroup.BodyCount > 1)
{
return;
}
if (prop.childrenProps.Count > 0)
{
// Reweld everything to this
prop.Unweld(true, this);
}
var thisBody = PhysicsBody;
var otherBody = prop.PhysicsBody;
// We want traces to now think the other body is now this body
otherBody.Parent = thisBody;
// Disable solid collisions on other prop so things attached with constraints wont collide with it
prop.EnableSolidCollisions = false;
// Merge all other shapes from other body into this body
for (int shapeIndex = 0; shapeIndex < otherBody.ShapeCount; ++shapeIndex)
{
var clonedShape = thisBody.AddCloneShape(otherBody.GetShape(shapeIndex));
// We don't want to be able to trace this cloned shape (but we want it to generate contacts)
clonedShape.DisableTraceQuery();
// Keep track of the cloned shape so they can be removed when unwelded
prop.clonedShapes.Add(clonedShape);
}
// Visually parent other prop to this prop
prop.Parent = this;
prop.weldParent = this;
// Keep track of welded children
childrenProps.Add(prop);
}
public void Unweld(bool reweldChildren = false, Prop reweldProp = null)
{
if (!weldParent.IsValid())
{
// Unweld our group, reweld them to the first child or something else
if (childrenProps.Count > 0)
{
// Create a copy of the child list so it doesn't get invalidated
var chilrenPropsCopy = childrenProps.ToList();
// Unweld all children
foreach (var childProp in chilrenPropsCopy)
{
childProp.Unweld();
}
if (!reweldChildren)
{
return;
}
if (!reweldProp.IsValid())
{
// If no reweld prop has been specified, reweld everything to the first child
// So that the child becomes the new weld parent
reweldProp = chilrenPropsCopy.First();
}
// For whatever reason, we don't have a prop to reweld to, bail
if (!reweldProp.IsValid())
{
return;
}
// Reweld all children to the new parent
foreach (var childProp in chilrenPropsCopy)
{
if (childProp != reweldProp)
{
reweldProp.Weld(childProp);
}
}
}
return;
}
// Remove us from the weld parent
weldParent.childrenProps.Remove(this);
// If weld parent has no physics body, it's probably pending destroy
if (weldParent.PhysicsBody.IsValid())
{
// Remove all of our cloned shapes from the weld parent
foreach (var shape in clonedShapes)
{
weldParent.PhysicsBody.RemoveShape(shape);
}
}
clonedShapes.Clear();
// If there's no physics body, we're probably pending destroy
if (PhysicsBody.IsValid())
{
Parent = null;
PhysicsBody.Parent = null;
EnableSolidCollisions = true;
}
weldParent = null;
}