libix3: support nested area searches

In 3D game engine use, it's convenient to be able to construct an ix3
for a model's mesh, in the model's local coordinate system.  This
model may then be instanced any number of times in the world via
matrix transformations.

When such instances are collidable objects and encounter eachother in
the world, it becomes necessary to perform nested area searches on the
same ix3.

The existing code only allowed for a single area search on a given
ix3 at a time.  This code changes that to a limit supplied to
ix3_new() as "max_asip" for "area searches in progress".

In scenarios where only point searches will be performed, 0 may be
supplied to save memory over the previous implementation.  A value
of 2 is satisfactory for my existing 3D game use cases, but any value
is supported, it just takes more memory in the ix3_object_t struct.

0 files changed, 0 insertions, 0 deletions