[Octave-bug-tracker] [bug #65431] crash after hgload certain data

[Nicholas Jankowski]

Follow-up Comment #20, bug #65431 (group octave):

with a simple example i can recreate the behavior of it malforming the
vertices data, but can't seem to trigger a crash. 


vert = [0 0 0; 0 1 0; 1 0 1; 1 1 1]
faces = [1 2 3; 2 3 4]
cdata = [1;30; 50; 60]

hp = patch ('faces',faces, 'vertices', vert, 'cdata', cdata, 'facecolor',
'interp', 'cdatamapping', 'direct')

view(3)

get (hp)
                                        ans =

                                          scalar structure containing the
fields:

                                            beingdeleted = off
                                            busyaction = queue
                                            buttondownfcn = [](0x0)
                                            children = [](0x1)
                                            clipping = on
                                            contextmenu = [](0x0)
                                            createfcn = [](0x0)
                                            deletefcn = [](0x0)
                                            handlevisibility = on
                                            hittest = on
                                            interruptible = on
                                            parent = -8.6013
                                            pickableparts = visible
                                            selected = off
                                            selectionhighlight = on
                                            tag =
                                            type = patch
                                            userdata = [](0x0)
                                            visible = on
                                            alphadatamapping = scaled
                                            ambientstrength = 0.3000
                                            backfacelighting = reverselit
                                            cdata =

                                                1
                                               10
                                               30
                                               50

                                            cdatamapping = direct
                                            diffusestrength = 0.6000
                                            displayname =
                                            edgealpha = 1
                                            edgecolor =

                                               0   0   0

                                            edgelighting = none
                                            facealpha = 1
                                            facecolor = interp
                                            facelighting = flat
                                            facenormals = [](0x0)
                                            facenormalsmode = auto
                                            faces =

                                               1   2   3
                                               4   5   6
                                                                              
                      
                                            facevertexalphadata = [](0x0)
                                            facevertexcdata =

                                                1
                                               10
                                               30
                                               50

                                            linestyle = -
                                            linewidth = 0.5000
                                            marker = none
                                            markeredgecolor = auto
                                            markerfacecolor = none
                                            markersize = 6
                                            specularcolorreflectance = 1
                                            specularexponent = 10
                                            specularstrength = 0.9000
                                            vertexnormals = [](0x0)
                                            vertexnormalsmode = auto
                                            vertices =

                                               0   0   0
                                               0   1   0
                                               1   0   1
                                               0   1   0
                                               1   0   1
                                               1   1   1

                                            xdata =

                                               0   0
                                               0   1
                                               1   1

                                            ydata =

                                               0   1
                                               1   0
                                               0   1

                                            zdata =

                                               0   0
                                               0   1
                                               1   1




x/y/zdata are fine.  cdata is the input data, not changed to map to x/y/zdata,
and duplicate vertices are created at shared points for each face. relatively
fewer shared points in this example than the crash example, so only 6 versus
intended 4, whereas the crash example had 3x as many. but not sure why it
would take a certain number more to crash it. 


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