eikonoklastes

I'm sorry, I'm still extremely confused. You mention a 6x6 inch grid, but I see a rectangle, not a square. Are you talking about each face being 6x6? Then you mention image 3 being an example of a 12x12 quad selection, but I see no 12x12 selection anywhere. It would really help if, rather than screenshots, you post a sketch of what you're after, or at least annotate over your screenshots, because I can't see what you're describing. Specifically, it would help if you could draw out exactly what "6x6" and "12x12" means.

The animation data is stored on the node you're keyframing. Shift+click the channel to bring up the Animation Editor for that track.

That documentation is for selecting gradient points in the Composite View, when working in a COP network. Is that what you're after, or are you referring to a ramp parameter in SOPs? If it's the latter, you can Ctrl+click to select non-contiguous points, or Shift+click to select a range in sequence. The visual indicator for the selection is pretty poor, but it does work.

I'm sorry, but I got completely lost. Can you post a couple of screenshots, preferably with sketches/annotations of what you're trying to achieve?

Sorry this is a bit off-topic, but surely the game engine you're running manages back-face culling by itself? Why manually delete perfectly good faces?

This was a bug that was fixed ages ago. You shouldn't be having this issue on any recent version of Houdini.

Make sure this is enabled:

If you install SideFX Labs, they add a handy option to the File menu, called 'Open Crashfile'.

This currently doesn't exist outside LOPs. Hopefully that changes soon.

Since you're in a Geometry network (SOPs), you're dealing with a single object, so it will export as a single object. There's probably a Python automation for this somewhere out there, but you need to basically follow these steps: Use a File SOP, set to Write, inside a For Each Primitive loop to export each face out to a separate file. Import all those files back into Houdini to create a separate Geometry network for each one (untick "Show sequences as one entry" in the import dialog and multi-select all the files as individuals entries). When using the FBX Export dialog, select only those objects as the Source Objects. That will give you a single FBX file with multiple, separate objects in them. Edit: There seems to be a bug currently (in both 18.0.499 and 18.0.532), where specifying multiple objects to export in the FBX export dialog results in a broken export (the file reimports empty). Using Alembic works, however. I've submitted a bug report, if you're having the same issue, please do the same.

Quad Remesher offers a 3-month subscription for $16. For the results it generates, that's a steal.

Here's a non-VEX approach, that doesn't even use any rotations. I'm applying a linear gradient across the top face, and then using a Soft Transform to move the points up based on that mask. You do need Labs for the Gradient SOP. columns01_soft_transform.hiplc

In the Material Palette, there's a Select button that does just that.

An Orientation Along Curve, with the Yaw set to -90 will also do this + take care of the corner points.

This looks like an unmitigated UX disaster.