I am not entirely sure whether I'm using the MObjectHandle correctly, but I
added 'self.vertsHandle = om.MObjectHandle(vertices)' to the doIt()
function. Where 'vertices' is from the 'sel.getComponent(0)'. In the
undoIt() function, I put the condition of 'self.vertsHandle.isAlive()'. It
still manages to crash on undo. I added some print statements to figure out
where it starts bugging. So in the undoIt, I'm printing the vert ID, the
color at that ID (self.sourceCols[v]) as well as the mesh (Mem address). I
am only printing, and not doing the assignment with setVertexColor, so like
this:
def undoIt(self):
if self.vertsHandle.isAlive():
print(self.vertsHandle.isAlive())
for v in self.verts:
print("v is {}".format(v))
print("sourceCols is {}".format(self.sourceCols[v]))
print("Mesh is {}".format(self.mesh))
It manages to print correctly on all undos, so the references seem solid.
And isAlive() returns true on it all. That kind of just leaves the mesh
function setVertexColor I suppose? On Tech-artists.org Slack, Theodox
mentioned there might be an issue somewhere with assignment of vertexColors
and not faceVertexColors. My logic says if I use a getVertexColors, I have
an array of MColors for each vertex, which shouldn't upset anything with
faceVertexColors, but I've tried a bunch of things to get this working
without luck, so my logic is failing me.
On Tuesday, October 9, 2018 at 1:40:58 PM UTC+2, dur wrote:
>
> Hello,
>
> So I have been quite stuck on a problem in regards to Maya crashing when I
> undo.
> More specifically, it will crash on second, third or fourth undo. So the
> undo step *can* work.
>
> def doIt(self, args):
> self.parseArguments(args)
> sel = om.MGlobal.getActiveSelectionList()
> __, vertices = sel.getComponent(0)
> fn_vertices = om.MFnSingleIndexedComponent(vertices)
> self.verts = fn_vertices.getElements()
> self.path = sel.getDagPath(0)
> self.mesh = om.MFnMesh(self.path)
> self.colors = self.mesh.getVertexColors()
> self.sourceCols = self.mesh.getVertexColors()
> self.redoIt()
>
> def redoIt(self):
> for v in self.verts:
> self.colors[v].r = self.sourceCols[v].b
> self.mesh.setVertexColor(self.colors[v], v)
> def undoIt(self):
> for v in self.verts:
> self.mesh.setVertexColor(self.sourceCols[v], v)
>
> This is the code. What I'm trying to do, is swap channels on a per vertex
> basis.
> I only want it to act on selected vertices. I am explicitly copying the
> blue to the red channel for test purposes.
>
> I know that some MArrays get referenced rather than copied, but I tried to
> check the sourceCols pre- and post redoIt, and it's identical.
>
> My biggest hurdle here is that I don't really know what to look for? I'm
> really not certain what's happening behind the curtain, since to me it
> looks like pretty basic steps:
>
> 1. save original color
> 2. init redo and change colors and apply to mesh
> 3. apply original colors to mesh on undo
>
> It always manages to get through the initial undo, but seems quite random
> after that.
> I have been stuck on this thing for two days soon. Any help would really
> be appreciated!
>
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