Message #2060

From: Roice Nelson <>
Subject: Re: [MC4D] first IRP
Date: Tue, 10 Apr 2012 10:41:14 -0500

Hi Ed,

Thank you for the reports.

I am not able to reproduce the problem you mention. For example, if I open
the "eb-MT-irp-66-4c-E 0p7-0-0.xml" IRP file that you uploaded to the
group, it loads and shows as an IRP (as long as the setting "Show as Skew"
is set to true). Let’s discuss further, but offline from the group, to see
if we can figure out what is happening for you.

It’s true that the inverse is not generally possible. While all the IRP
puzzles have a hyperbolic representation, a random hyperbolic
tiling/coloring will not typically have an associated IRP. So please be
advised that the settings under the "Skew Polyhedra (IRP and 4D)" section
do not apply to any of the Spherical/Euclidean/Hyperbolic puzzles.

There is indeed a small amount of overlap at the moment, because of puzzles
I had already made before ever starting the IRP work. Another reason I
left those in for now is that my code doesn’t yet support IRP puzzles with
mixed turning, so the {4,4} 9C puzzle in the Euclidean section has some
extra twisting options that the IRP version doesn’t have. I do hope to
make this better in the future, and to remove the few duplicate
puzzles that are there.

Thanks again,

On Tue, Apr 10, 2012 at 7:43 AM, Eduard <> wrote:

> Hi Roice,
> I played in IRP. When I reopen the saved File then I’m automatically in a
> hyperbolic view. I cannot change to the IRP view.
> For all IRP (when not reopened) and for Skew Polyhedra it is possible to
> change to the hyperbolic view (both: Poincarré and Klein) with
> "Setting/Skew Polyhedra (IRP and 4D)/Show as skew/ false" and reverse.
> The inverse is not possible: start with a hyperbolic puzzle then change to
> the IRP or Skew.
> Normally there is no overlapping. The more recent IRP puzzles avoid
> redundancy with the hyperpolic puzzles.
> This is not allways the case. Example:
> Skew Polyhedra / {4,4|3} 9c F 0:0:1 is equivalent to
> Euclidian / Klein / {4,4} 9c F 0:0:1.
> For some cases the visibility in IRP is not as easy as in the hypebolic
> view.
> Regards
> Ed