Does removing a SubShape change the CompoundShape Shapes Array?

[DennisSmolek]

I'm working on a version of dynamic shapes and trying to figure out the best way to track the identity of a subshape so I can modify it at runtime.

The ModifyShape method takes the index of the shape.

What I'm worried about is the RemoveShape method...
Lets say I have shapes like MyCompoundShape = [(A:0), B:1), (C:2), (D:3)]

If I do MyCompounShape.RemoveShape(1)

In Javascript the shapes array would look like: [(A:0), (C:1), (D:2),]

Which means shapes C & D have new indexes. However I'm not sure if the C++ Array would work this way as its an Array and not a Vector so it might maintain the indexes.

I thought about using GetSubShapeIDFromIndex and storing the subshape but it's a little confusing how this works and what params I'd pass around.

My other solution was to just set a hash in UserData and track that, then make a getter, but that's a lot of overhead if it isn't needed.

If Indexes don't change I'll go with that, if they do I'll probably buckle down on the SubShapeID

[jrouwe]

When you call RemoveShape(1) the indexes shift, so you'll end up with A:0, C:1, D:2.

Note that the SubShapeID basically encodes a sub shape index, so if you get a SubShapeID and then remove a sub shape, it will no longer point to the same sub shape.

The UserData of a sub shape was meant to keep track of sub shapes while adding/removing and is the only thing that can be used reliably (although from your post I gather you want the indices to shift, so maybe you don't need to track anything extra).

[DennisSmolek]

In my application I'm not too concerned with the index on it's own but as it was a factor in getting the subShapeId.
But if it changes then I'll not really need it at all. Instead I'll create a hash and set the userData then make a getter of my own.

Thanks as always for the quick reply!