Using MATLAB offline converter on a specific 3D data results in incorrect scatter (2d) traces

Hello,

I am using MATLAB-Online project to convert several types of MATLAB figures.

When converting offline a specific data file, I got a problem. The data output contains correct scatter3d traces and some incorrect scatter (2d) traces.

The conversion seems to generate scatter (2d) when all the points are null.

Here is the demo data I was using:
S0307904X13006549_mmc3.fig.zip

Here is an extract of the data output:

{"xaxis": "x1", "yaxis": "y1", "type": "scatter3d", "visible": true, "x": [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, 5.63689383869668, 5.64508977832848, 5.65341212279236, 5.66186758105614, 5.67046301659407, 5.67920545270251, 5.68810207811812, 5.6971602529484, 5.70638751492477, 5.71579122660169, 5.72537061117376, 5.73511647921464, 5.74501900827905, 5.75506808766196, 5.76525330686215, 5.77556394482557, 5.78598896000782, 5.79651698129621, 5.80713629983312, 5.81783486178309, 5.82860119863198, 5.83945211159075, 5.85043815341148, 5.86161314109058, 5.87303238903726, 5.88475277708649, 5.89683283750358, 5.90933286176889, 5.92231502798872, 5.93584354984999, 5.94998484812126, 5.96480519796425, 5.98026657891274, 5.99618555498522, 6.01236177154192, 6.02858736883488, 6.0446468343821, 6.06031710840586, 6.075367954665, 6.08956260808861, 6.10265870902218, 6.11440953162187, 6.12456828063123, 6.13305410541098, 6.14004917583194, 6.14576486134641, 6.15041810174679, 6.15423005334148, 6.15742498254285, 6.16022941510505, 6.16287154671415, 6.16558091877528, 6.16858836206604, 6.17212510787577, 6.17632123719976, 6.18112238422819, 6.18645468485145, 6.19224390235613, 6.19841523799837, 6.20489317036368, 6.2116013237274, 6.21846236575107, 6.22539793494539, 6.23232859839996, 6.23917402638176, 6.24588313817417, 6.25246798614153, 6.25894887473455, 6.26534639778948, 6.27168142850153, 6.27797511149794, 6.28424885705085, 6.29052433746826, 6.29682348570018, 6.30316849619612, 6.30958180639534, 6.31607876049659, 6.32265678523466, 6.32931054457722, 6.33603463644034, 6.3428235908676, 6.34967186835346, 6.35657385831332, 6.36352387770268, 6.37051616978808, 6.37754490307229, 6.38460417203401, 6.39168965083804, 6.39880173648656, 6.40594168679499, 6.41311077454258, 6.42031028758959, 6.42754152900108, 6.43480581717726, 6.44210448599049, 6.44943888492919, 6.45681037924859, 6.46422035012848, 6.4716701948381, 6.47916132690821, 6.48669517631051, 6.49427318964444, 6.50189683033155, 6.50956757881745, 6.51728693278158, null, null, null, null], "y": [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, 3.8226454951729, 3.82125980852096, 3.81987569324372, 3.81849264390595, 3.81711021526707, 3.81572802368575, 3.81434574857464, 3.81296313390312, 3.8115799897457, 3.81019625701573, 3.80881337020945, 3.80743413798739, 3.80606129946625, 3.8046974557254, 3.80334506597179, 3.80200644420904, 3.80068375642172, 3.79937901828428, 3.79809409340291, 3.79683069209711, 3.7955902393726, 3.79437011289294, 3.79316344641624, 3.79196368324697, 3.79076484791105, 3.78956156224558, 3.78834906754305, 3.78712325266324, 3.78588068799415, 3.78461866510833, 3.78333524191975, 3.78202954706387, 3.78071174646796, 3.77940460020768, 3.77812917587548, 3.77690375579033, 3.77574385451905, 3.77466232780884, 3.77366957104429, 3.77277380507409, 3.77198144718061, 3.77129756512686, 3.77072625348083, 3.77026212216174, 3.76988693455152, 3.76958362856324, 3.76933705673091, 3.76913350794494, 3.7689603223866, 3.76880559839705, 3.76865799035918, 3.76850659694303, 3.76834093924273, 3.76815107832272, 3.76793230595131, 3.7676885608728, 3.76742461315755, 3.76714510359526, 3.76685448228779, 3.76655695769013, 3.7662564560711, 3.76595659134048, 3.76566064516696, 3.76537155729317, 3.76509191968762, 3.76482300956359, 3.76456391074235, 3.7643135286402, 3.76407086171262, 3.76383499725328, 3.76360510792272, 3.76338044899898, 3.76316035634225, 3.76294424506594, 3.76273160890586, 3.76252202077011, 3.76231529265998, 3.76211166588577, 3.76191142500647, 3.76171483369939, 3.76152213444226, 3.76133354825038, 3.76114927446839, 3.76096949061616, 3.76079435228806, 3.76062399310505, 3.76045852470071, 3.7602980200891, 3.76014249252676, 3.75999194925839, 3.75984640160776, 3.75970586496081, 3.75957035875015, 3.75943990644072, 3.75931453551685, 3.75919427747049, 3.75907916779069, 3.75896924595431, 3.75886455541784, 3.75876514361046, 3.75867106192811, 3.7585823657288, 3.75849911432886, 3.75842137100025, 3.75834920296896, null, null, null, null], "z": [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, 0.146066820065401, 0.144152045226945, 0.142236364146095, 0.140319483611641, 0.13840117810348, 0.136481293826506, 0.134559752966614, 0.132636558182426, 0.130711797346742, 0.128785721502537, 0.126860330918397, 0.124939274068026, 0.123026192389182, 0.121124637619086, 0.119238062946056, 0.117369814217439, 0.115523121260261, 0.113701089372871, 0.111906691047438, 0.110142757984358, 0.108411824323837, 0.106711842272831, 0.105035932607347, 0.103377564365756, 0.101730893291861, 0.1000908127832, 0.0984530150747002, 0.0968140637592698, 0.0951714788244603, 0.0935238354799716, 0.09187087816433, 0.0902139307559516, 0.088566862161567, 0.0869573525566659, 0.0854107598868807, 0.0839486831332842, 0.0825887678689736, 0.0813446454174485, 0.0802260228146818, 0.0792389394105653, 0.0783862036483462, 0.0776680203383176, 0.0770826591503452, 0.0766187361817524, 0.0762532786948243, 0.0759658965871394, 0.0757392603454008, 0.0755583766511808, 0.0754099861758747, 0.0752820950115683, 0.0751636476502566, 0.0750443468404112, 0.0749146240157476, 0.0747658085579457, 0.0745944555739132, 0.0744051923329807, 0.0742033847783902, 0.0739941985603133, 0.0737824899708854, 0.0735727118338691, 0.0733688346483736, 0.0731742834530428, 0.0729918910079001, 0.0728238679856157, 0.0726717870603979, 0.0725360255966068, 0.0724155116086254, 0.0723091646718152, 0.0722160714845033, 0.0721354812840368, 0.0720668023926036, 0.0720095999482062, 0.0719635948735448, 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{"xaxis": "x1", "yaxis": "y1", "type": "scatter", "visible": true, "x": [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null], "y": [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null], "mode": "lines", "showlegend": true}

This issue was related to PlotyJS issue: https://github.com/plotly/plotly.js/issues/1272.

Thanks for your help !

Start by reproducing the offline conversion with the linked S0307904X13006549_mmc3.fig.zip demo data and compare the generated scatter3d and scatter traces with the related PlotlyJS issue. Done means the converter no longer emits incorrect 2D scatter traces for the all-null points while preserving the valid 3D traces.