node_Viewer.py / Viewer draw about sverchok

[zeffii]

I don't understand this code well enough to make a fix yet.

[ly29]

This is in the category of non important errors, still an error.
What happens is that every time you create a socket by calling self.inputs.new() in def init(self, context)
the update function is called.
To fix add check that the 'matrix' key is in self.inputs, like:
if 'Float' in self.inputs and self.inputs['Float'].links:

The update function is furthermore called on every editor change...
Long term we should change sverchok to handle, this and the pynodes interface is also evolving.

[zeffii]

the update function is quite difficult to read.

[nortikin]

i didn't even looket to update function, to my shame. This difficult part for me

[ly29]

Some notes on the general problem of the update function:

Note that this error is due to general problem with how blender calls the update function on editor changes, also before the init functon finishes. So update should be able to handle a state where, for example, only half the sockets that are created in init are created...

Once the node is created update is called on every node update, either from the general update function in node_s or from the updateNode function that we attach to changing number fields for example.

In conclusion, this should be fixed so the update function verifies that the socket exist before trying to access it. However this error is non critical in the way that once the node is created it does not happen again and nothing actually breakes because of this error.

If you want some further pointers on how the update system works I can try explain it better.

[zeffii]

thank you nortikin and ly29 getting sverchok this far, and acknowledging + explaining the scenario.of the error. It's good to document these things concretely..I've noticed other non critical errors cascade from them.

[zeffii]

can't we stick a

if not all([x in self.inputs for x in ['vertices', 'edg_pol', 'matrix']]):
      return

in the update, before checking the link presence. This way also the various separate checks on self.inputs for vertices edg_pol and matrix can be skipped.

like snippet:

    def update(self):
        global cache_viewer_baker
        cache_viewer_baker[self.name+'v'] = []
        cache_viewer_baker[self.name+'ep'] = []
        cache_viewer_baker[self.name+'m'] = []

        if not all([x in self.inputs for x in ['vertices', 'edg_pol', 'matrix']]):
            return

        if self.activate and (self.inputs['vertices'].links or self.inputs['matrix'].links):
            callback_disable(self.name)

            if self.inputs['vertices'].links and \
                type(self.inputs['vertices'].links[0].from_socket) == VerticesSocket:

                propv = SvGetSocketAnyType(self, self.inputs['vertices'])
                cache_viewer_baker[self.name+'v'] = dataCorrect(propv)
            else:
                cache_viewer_baker[self.name+'v'] = []

            if self.inputs['edg_pol'].links and \
                type(self.inputs['edg_pol'].links[0].from_socket) == StringsSocket:
                prope = SvGetSocketAnyType(self, self.inputs['edg_pol'])
                cache_viewer_baker[self.name+'ep'] = dataCorrect(prope)
                #print (prope)
            else:
                cache_viewer_baker[self.name+'ep'] = []

            if self.inputs['matrix'].links and \
               type(self.inputs['matrix'].links[0].from_socket) == MatrixSocket:
                    propm = SvGetSocketAnyType(self, self.inputs['matrix'])
                    cache_viewer_baker[self.name+'m'] = dataCorrect(propm)
            else:
                cache_viewer_baker[self.name+'m'] = []

   (.....)

[ly29]

Yes something like that would work.

11 apr 2014 kl. 12:01 skrev "Dealga McArdle" [email protected]:

can't we stick a

if not all([x in self.inputs for x in ['vertices', 'edg_pol', 'matrix']]):
return
in the update, before checking the link presence. This way also the various separate checks on self.inputs for vertices edg_pol and matrix can be skipped.

like snippet:

def update(self):
    global cache_viewer_baker
    cache_viewer_baker[self.name+'v'] = []
    cache_viewer_baker[self.name+'ep'] = []
    cache_viewer_baker[self.name+'m'] = []

    if not all([x in self.inputs for x in ['vertices', 'edg_pol', 'matrix']]):
        return

    if self.activate and (self.inputs['vertices'].links or self.inputs['matrix'].links):
        callback_disable(self.name)

        if self.inputs['vertices'].links and \
            type(self.inputs['vertices'].links[0].from_socket) == VerticesSocket:

            propv = SvGetSocketAnyType(self, self.inputs['vertices'])
            cache_viewer_baker[self.name+'v'] = dataCorrect(propv)
        else:
            cache_viewer_baker[self.name+'v'] = []

        if self.inputs['edg_pol'].links and \
            type(self.inputs['edg_pol'].links[0].from_socket) == StringsSocket:
            prope = SvGetSocketAnyType(self, self.inputs['edg_pol'])
            cache_viewer_baker[self.name+'ep'] = dataCorrect(prope)
            #print (prope)
        else:
            cache_viewer_baker[self.name+'ep'] = []

        if self.inputs['matrix'].links and \
           type(self.inputs['matrix'].links[0].from_socket) == MatrixSocket:
                propm = SvGetSocketAnyType(self, self.inputs['matrix'])
                cache_viewer_baker[self.name+'m'] = dataCorrect(propm)
        else:
            cache_viewer_baker[self.name+'m'] = []

(.....)
—
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[zeffii]

maybe: https://gist.github.com/zeffii/10456412

[ly29]

Yes it should work fine here.
A potential problem with this as a general solution is that socket.name is not a guaranteed to be unique.

[zeffii]

OK, i'll stick to smaller changes for the time being. Thanks for the review, I understand the reservation.