Cell history deleted by [[ KILLGLIDERS ]]

[Gamedziner]

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#C [[ KILLGLIDERS ]]
x = 36, y = 9, rule = B3/S23
24bo11b$22bobo11b$12b2o6b2o12b2o$11bo3bo4b2o12b2o$2o8bo5bo3b2o14b$2o8b
o3bob2o4bobo11b$10bo5bo7bo11b$11bo3bo20b$12b2o!

At generation 18, the cell at (21,6) is a shade of blue, indicating that the cell was once alive. On the next generation, the cell turns black, indicating that the cell was never alive. This glitch is much more obvious when you put a block in the path of a stream of gliders where it will be cleanly destroyed:

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#C [[ KILLGLIDERS ]]
x = 52, y = 37, rule = B3/S23
24bo11b$22bobo11b$12b2o6b2o12b2o$11bo3bo4b2o12b2o$2o8bo5bo3b2o14b$2o8b
o3bob2o4bobo11b$10bo5bo7bo11b$11bo3bo20b$12b2o27$50b2o$50b2o!

[rowett]

This has been fixed and will be in the next released build. Test case is here.

Thanks for reporting!

[Gamedziner]

On a similar note, putting a long, straight line of cells near a glider can allow a glider outside the rest of the bounding box to interact; [[KILLGLIDERS]] does not take this into account:

A consequence of KILLGLIDERS:

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x = 50, y = 16, rule = B3/S23
22b3o$22bo$23bo13$50o!

Code: Select all

x = 50, y = 16, rule = B3/S23
22b3o$22bo$23bo13$50o!
#C [[ KILLGLIDERS ]]

Also, it removes the history cells that the glider overlaps, for some strange reason.

(It also seems I gave wrong credit for the bug earlier. Oops!)

[rowett]

On a similar note, putting a long, straight line of cells near a glider can allow a glider outside the rest of the bounding box to interact; [[KILLGLIDERS]] does not take this into account

True, and it probably won't. Thanks for letting me know.