LifeViewer/Known bugs

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This page contains a list of issues within LifeViewer which are not considered to be a high enough priority to fix immediately, with test cases where they apply.

  • Please report any new bugs to this forum topic. This page is for unresolved issues that have already been reported.
  • Issues which are not fixable are documented at LifeViewer/Known bugs/Not fixable. Checking there is recommended before reporting bugs in the event that said issue is already listed there.

Playback

  • Twisted edges of Klein bottles and cross-surfaces might not be being processed correctly in PCA rules.
    • In the following pattern, a single PCA cell crosses the twisted edge of a Klein bottle. In a normal unbounded plane, the cell, being in the "west" state, would become a "south" cell in the next generation. In this example, since it crosses a twisted boundary, it'd be expected that it would be flipped vertically (or, equivalently, rotated 180 degrees), and would become a "north" cell as a result. However, in this demonstration, it still becomes a "south" cell.
x = 5, y = 2, rule = 2PCA4,0,2,4,12,8,5,9,7,1,6,10,11,3,13,14,15:K5,5* b$4.A! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] [[ THEME Book ]]
(click above to open LifeViewer)
  • The current generation shown in the generation statistics menu is inconsistent between non-reversible and reversible rulespaces if a custom starting generation has been specified via #CXRLE Gen.
    • It'd be expected that either both cases would follow CXRLE Gen (as to be consistent with the T button itself as well as the "Life ended at" text), both would ignore it, or both the relative and absolute generations would be displayed in the generation statistics menu (this option is preferable since it'd allow for the unabbreviated relative generation to be obtained, as well as the absolute generation to be seen which would assist greatly with timed scripts).
NI Moore Margolus
#CXRLE Gen=-200 x = 1, y = 1, rule = MAPAAAAAAAAAAAAAAAAAAAAAP////////////////////8AAAAAAAAAAAAAAAAAAAAA/////////////////////w o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ STARTFROM 25 THEME Book ZOOM 8 SHOWGENSTATS THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
#CXRLE Gen=-200 x = 1, y = 1, rule = M0,4,8,12,4,12,12,13,8,12,12,14,12,13,14,15 o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ STARTFROM 25 THEME Book ZOOM 8 SHOWGENSTATS THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
  • In many cases, script commands will persist after resuming playback if Identify is used while script-related sequences are underway.[1]

Pattern editing

  • Selections can often appear offset from their actual location when using bounded grids.
    • This generally arises due to the bounding box specified in the RLE (x = width, y = height) differing from the actual bounding box of the pattern encoded by the RLE.
    • This is more than a visual issue, as certain selections cannot be created in certain positions, and cannot be correctly manipulated either.
    • This issue is on the backlog to fix.[2]
x = 12, y = 12, rule = B3/S23:T20 8o$8o$8o$8o$8o$8o$8o$8o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
(click above to open LifeViewer)
  • In the general-range algorithm, selections behave oddly at the very edge of the unbounded grid.
    • For range 1 in the general range algorithm, the three cells at the edge are effectively treated as one. Any selection in a cell one or two away from the edge will snap to the very edge, and any selection containing any of those cells plus cells four or more cells away will select all three of those cells.
    • Since the three cells at the very edge cannot be modified at all, it'd be preferable if selections simply could not be made at the three cells at the edge for this algorithm. The fact that selections can be made here st all can result in unwanted deletion of cells when flipping or rotating selections containing them.
Standard General
x = 2, y = 2, rule = B/S01234V 2o$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 9 X -256 THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 2, y = 2, rule = R1,C2,S0-4,B,NN 2o$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 9 X -256 THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
  • Changes made to a pattern via selections can become impossible to undo after the Reset button is used.
    • On the following pattern, using the Select tool, select one of the shapes and then use the "Clear Selection" button to remove it, then get rid of the selection by clicking somewhere else. After this, press the reset button, and the Undo button will become locked, rendering the change irreversible.
x = 21, y = 8, rule = B3/S23 8o8b2o$8o8b2o$8o7b4o$8o7b4o$8o6b6o$8o6b6o$8o5b8o$8o5b8o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
(click above to open LifeViewer)

Identify

  • Dying cells in the range-1 algorithm are handled differently from the same cells in the general-range algorithm, being counted towards the pattern bounding box in the former but not the latter.
    • This also affects AutoFit during playback.
    • A fix for this is planned.[3]
range-1 general-range
x = 68, y = 9, rule = 23/34/128 4.sW.sT3.sK.sH3.rW.rT3.rK.rH3.qW.qT3.qK.qH3.pW.pT3.pK.pH3.W.T3.K.H$3. sXtAsUsTsU.sLsMsIsHsI.rXsArUrTrU.rLrMrIrHrI.qXrAqUqTqU.qLqMqIqHqI.pXqA pUpTpU.pLpMpIpHpI.XpAUTU.LMIHI.3A$2.tBtD2tA2sVsNsP2sM2sJsBsD2sA2rVrNrP 2rM2rJrBrD2rA2qVqNqP2qM2qJqBqD2qA2pVpNpP2pM2pJpBpD2pA2VNP2M2JBD2A$2.tC .2tDsUsXsOsT2sPsIsLsCsH2sDrUrXrOrT2rPrIrLrCrH2rDqUqXqOqT2qPqIqLqCqH2qD pUpXpOpT2pPpIpLpCpH2pDUXOT2PILCH2D2A$4.tFtDtBsXsVsTsRsPsNsLsJsHsFsDsB rXrVrTrRrPrNrLrJrHrFrDrBqXqVqTqRqPqNqLqJqHqFqDqBpXpVpTpRpPpNpLpJpHpFpD pBXVTRPNLJHFDBA$3.tCtFsUtB2sVsOsRsIsN2sJsCsFrUsB2rVrOrRrIrN2rJrCrFqUrB 2qVqOqRqIqN2qJqCqFpUqB2pVpOpRpIpN2pJpCpFUpB2VORIN2JCFABA$.2tG2tDsTsV 2sS2sPsHsJ2sG2sDrTrV2rS2rPrHrJ2rG2rDqTqV2qS2qPqHqJ2qG2qDpTpV2pS2pPpHpJ 2pG2pDTV2S2PHJ2G2D2A$tFtGtCtBtC.sRsSsOsNsO.sFsGsCsBsC.rRrSrOrNrO.rFrG rCrBrC.qRqSqOqNqO.qFqGqCqBqC.pRpSpOpNpO.pFpGpCpBpC.RSONO.FGCBC$.tE.tB 3.sQ.sN3.sE.sB3.rQ.rN3.rE.rB3.qQ.qN3.qE.qB3.pQ.pN3.pE.pB3.Q.N3.E.B! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOFIT THEME Book THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 68, y = 9, rule = R1,C128,S2-3,B3-4 4.sW.sT3.sK.sH3.rW.rT3.rK.rH3.qW.qT3.qK.qH3.pW.pT3.pK.pH3.W.T3.K.H$3. sXtAsUsTsU.sLsMsIsHsI.rXsArUrTrU.rLrMrIrHrI.qXrAqUqTqU.qLqMqIqHqI.pXqA pUpTpU.pLpMpIpHpI.XpAUTU.LMIHI.3A$2.tBtD2tA2sVsNsP2sM2sJsBsD2sA2rVrNrP 2rM2rJrBrD2rA2qVqNqP2qM2qJqBqD2qA2pVpNpP2pM2pJpBpD2pA2VNP2M2JBD2A$2.tC .2tDsUsXsOsT2sPsIsLsCsH2sDrUrXrOrT2rPrIrLrCrH2rDqUqXqOqT2qPqIqLqCqH2qD pUpXpOpT2pPpIpLpCpH2pDUXOT2PILCH2D2A$4.tFtDtBsXsVsTsRsPsNsLsJsHsFsDsB rXrVrTrRrPrNrLrJrHrFrDrBqXqVqTqRqPqNqLqJqHqFqDqBpXpVpTpRpPpNpLpJpHpFpD pBXVTRPNLJHFDBA$3.tCtFsUtB2sVsOsRsIsN2sJsCsFrUsB2rVrOrRrIrN2rJrCrFqUrB 2qVqOqRqIqN2qJqCqFpUqB2pVpOpRpIpN2pJpCpFUpB2VORIN2JCFABA$.2tG2tDsTsV 2sS2sPsHsJ2sG2sDrTrV2rS2rPrHrJ2rG2rDqTqV2qS2qPqHqJ2qG2qDpTpV2pS2pPpHpJ 2pG2pDTV2S2PHJ2G2D2A$tFtGtCtBtC.sRsSsOsNsO.sFsGsCsBsC.rRrSrOrNrO.rFrG rCrBrC.qRqSqOqNqO.qFqGqCqBqC.pRpSpOpNpO.pFpGpCpBpC.RSONO.FGCBC$.tE.tB 3.sQ.sN3.sE.sB3.rQ.rN3.rE.rB3.qQ.qN3.qE.qB3.pQ.pN3.pE.pB3.Q.N3.E.B! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOFIT THEME Book THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)

Pattern loading

  • Margolus patterns on bounded grids will delete the top row and leftmost column of the pattern when loaded, unlike in other rulespaces.
    • Other issues can arise from this, particularly if the top-left cell should be alive but is not. For example, a "New Pattern" message will not be displayed despite no alive cells being present, the population counter will report that one live cell is present, and using "Select All" creates a selection at the bottom right corner of the bounded grid.
    • Fixes for Margolus pattern positioning on bounded grids are on the backlog.[4]
Margolus outer-totalistic
x = 12, y = 12, rule = M0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15:T10 $3bob5o$2bo2bob2o$2b2obo2b3o$b2ob6o$2bo$b6obo$b6o2b2o$2b3o4b2o$bobobo $b2obob2o2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 12, y = 12, rule = B/S012345678:T10 $3bob5o$2bo2bob2o$2b2obo2b3o$b2ob6o$2bo$b6obo$b6o2b2o$2b3o4b2o$bobobo $b2obob2o2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
  • Triangular patterns loaded on bounded grids also result in cell deletion.
    • For either of the following two patterns, drawing a cell at the very top left of the bounded grid, using Save Pattern and then reloading the pattern will result in everything being shifted down and to the right.
range-1 general-range
x = 5, y = 5, rule = B/S0123456789XYZL:P6 $b4o$b4o$b4o$b4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 5, y = 5, rule = R1,C2,S0-12,B,NL:P6 $b4o$b4o$b4o$b4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
  • The position of the vertical line in the playback speed slider when the pattern is first loaded differs from the position it is set to when pressing the "1x" button.
    • The speed slider has an intentional dead zone that allows for users to more easily select 1x speed. However, it'd be expected that the "default" position of this slider would be consistent between newly loaded patterns and uses of the 1x button.
x = 4, y = 3, rule = B2e3r/S2k obo$o2bo$bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
(click above to open LifeViewer)
  • If the first line of the RLE defines the x or y size of a pattern to be 0 or -0, this value will be converted to 1 in Help > Info > Pattern.
    • Values -1 and below remain the same.
    • In addition, truly empty input patterns will be calculated as having a size of 1×1 despite containing no cell data.
2×0 0×2 0×0
x = 2, y = 0, rule = B/S ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 0, y = 2, rule = B/S ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 0, y = 0, rule = B/S ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
-2×-0 -0×-2 -0×-0
x = -2, y = -0, rule = B/S ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = -0, y = -2, rule = B/S ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = -0, y = -0, rule = B/S ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
  • If all living cells in a pattern are placed wholly outside of the edges of a bounded grid such that there are no living cells within the boundaries, no "New pattern" message is displayed.
empty grid placed outside
x = 1, y = 1, rule = B3/S23:T10,10 ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 1, y = 1, rule = B3/S23:T10,10 20bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
  • Negative zero is not always accepted as zero for some bounded grid definitions, even though it probably should be.[5]
  • The rule "B3/S23H" is assigned the alias "LifeH", despite this alias not actually being defined anywhere in the Aliases section.
    • B3/S23L is not named "LifeL", which is correct. However, this may be due to the existence of a proper alias for this rule (Life 2333), which may be overriding the existence of a LifeL bug.
    • LifeH is (incorrectly) accepted as an alias in RLEs, but LifeL is not.
B3/S23H B3/S23L
x = 1, y = 1, rule = B3/S23H ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ SHOWGENSTATS THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 1, y = 1, rule = B3/S23L ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ SHOWGENSTATS THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
LifeH LifeL
x = 1, y = 1, rule = LifeH ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ SHOWGENSTATS THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 1, y = 1, rule = LifeL ! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ SHOWGENSTATS THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)

Rendering

  • The grid lines used to partition the grid in Margolus rules are not consistent in representing the partitioned regions.
    • It would be expected that either GRIDMAJOR would represent the "active" partitioning, or GRID would, but not interchangeably depending on the input pattern. The former would be preferable.
GRID used GRIDMAJOR used
x = 1, y = 1, rule = M0,2,8,3,1,5,6,7,4,9,10,11,12,13,14,15 o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ COLOR GRIDMAJOR Black GRIDMAJOR 2 THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 1, y = 1, rule = M0,2,8,3,1,5,6,7,4,9,10,11,12,13,14,15 $o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ COLOR GRIDMAJOR Black GRIDMAJOR 2 THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
  • AUTOFIT used on hexagonal grid spaceships may not be centering as expected.
    • For the following three orientations of the same spaceship, note how the spaceship travelling directly up seems overall symmetric when the three phases are overlayed, whereas the other two have slight asymmetries (for example, one of the back hexagons intersects the hexagon above it, but is completely disjoint from the equivalent one below it).
    • The thumbnail preview viewers appear to render these correct and symmetric as expected (however are not centered).
"Up left" Up "Up right"
x = 4, y = 4, rule = B2/S2H obo$2obo2$2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 14 AUTOSTART AUTOFIT THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 4, y = 4, rule = B2/S2H 2o$bo$o2bo$bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 14 AUTOSTART AUTOFIT THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
x = 4, y = 4, rule = B2/S2H obo$ob2o2$2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 14 AUTOSTART AUTOFIT THUMBNAIL THUMBSIZE 4 WIDTH 600 HEIGHT 600 ]]
(click above to open LifeViewer)
  • Selections appear to overextend in the negative axes, while not quite reaching cell edges on the positive axes.
    • For the following, using Select All and then zooming in and out will reveal this.
    • Rotating the camera by 90 degree intervals reveals similar effects in other directions.
x = 7, y = 7, rule = W0:P7 o6$6bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] [[ GRID OFF ]]
(click above to open LifeViewer)

Platform-exclusive issues

iOS

Pattern editing

  • Copying patterns to the external clipboard does not appear to actually work.

References

  1. ↑ https://conwaylife.com/forums/viewtopic.php?f=3&t=1622&p=158331#p158331
  2. ↑ https://conwaylife.com/forums/viewtopic.php?f=3&t=1622&start=2600#p156655
  3. ↑ https://conwaylife.com/forums/viewtopic.php?p=158545#p158569
  4. ↑ https://conwaylife.com/forums/viewtopic.php?p=157478#p157487
  5. ↑ https://conwaylife.com/forums/viewtopic.php?f=3&t=1622&start=3150#p162446
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