Python Viewer States Issues

Forums Technical Discussion Python Viewer States Issues

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Alexey Vanzhula: Member; 538 posts; Joined: Dec. 2006; Offline

Dec. 15, 2019 8:12 a.m.

I decided to post python viewer states problems in this thread.

In H17.5, after activation with onResume method, the state continues to generate the mouse move event (hou.uiEventReason.Located). But in H18 this type of event stops happening.

Test build: Houdini 18.0.318 Linux version

Edited by Alexey Vanzhula - Dec. 15, 2019 08:16:45

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Alexey Vanzhula: Member; 538 posts; Joined: Dec. 2006; Offline

Dec. 15, 2019 8:30 a.m.

I have solve the problem myself

def onGenerate(self, kwargs):
    kwargs['state_flags']['mouse_drag'] = True

Anyway, according to the documentation:

Mouse drag events are generated by default (True)

this value have to be True by default, but in fact it is not.

Edited by Alexey Vanzhula - Dec. 15, 2019 08:30:56

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Alexey Vanzhula: Member; 538 posts; Joined: Dec. 2006; Offline

Dec. 15, 2019 2:32 p.m.

Another problem. The stroke_demo.hip example works much slower then in H17.5.

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Alexey Vanzhula: Member; 538 posts; Joined: Dec. 2006; Offline

Dec. 22, 2019 6:30 a.m.

In H17.5 and H18 I can't change the wireframe display mode color with the hou.SimpleDrawable.setWireframeColor method.

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Alexey Vanzhula: Member; 538 posts; Joined: Dec. 2006; Offline

Dec. 22, 2019 8:09 a.m.

Currently, we can't draw the drawable geometry immediately after activating the state in the onEnter or onGenerate methods. In the current Python states implementation, we must first move the mouse to update the drawables. So, we need a method to force update.

Edited by Alexey Vanzhula - Dec. 22, 2019 09:18:36

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Alexey Vanzhula: Member; 538 posts; Joined: Dec. 2006; Offline

Dec. 22, 2019 9:20 a.m.

Python states part of the Houdini documentation has a lot of mistakes.

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mabelzile: Staff; 396 posts; Joined: Feb. 2018; Offline

Jan. 3, 2020 10:09 a.m.

vux
I decided to post python viewer states problems in this thread.

In H17.5, after activation with onResume method, the state continues to generate the mouse move event (hou.uiEventReason.Located). But in H18 this type of event stops happening.

Test build: Houdini 18.0.318 Linux version

Ok thanks for reporting. It's best to log bugs though so python states issues don't fall in the cracks.


mabelzile: Staff; 396 posts; Joined: Feb. 2018; Offline

Jan. 3, 2020 10:11 a.m.

vux
In H17.5 and H18 I can't change the wireframe display mode color with the hou.SimpleDrawable.setWireframeColor method.

This problem has already been reported and it is not yet fixed.


mabelzile: Staff; 396 posts; Joined: Feb. 2018; Offline

Jan. 3, 2020 10:13 a.m.

vux
Currently, we can't draw the drawable geometry immediately after activating the state in the onEnter or onGenerate methods. In the current Python states implementation, we must first move the mouse to update the drawables. So, we need a method to force update.

Use `hou.GeometryViewport.draw()` to force a redraw.


Alexey Vanzhula: Member; 538 posts; Joined: Dec. 2006; Offline

Jan. 4, 2020 3:52 a.m.

Thank you for answers!

mabelzile
vux
Currently, we can't draw the drawable geometry immediately after activating the state in the onEnter or onGenerate methods. In the current Python states implementation, we must first move the mouse to update the drawables. So, we need a method to force update.

Use `hou.GeometryViewport.draw()` to force a redraw.

Yes, but this did not work in my case. I will show my example in a few hours

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Alexey Vanzhula: Member; 538 posts; Joined: Dec. 2006; Offline

Jan. 4, 2020 4:13 a.m.

In this example, I want the circle to appear immediately after the state is activated. But it appears only after I start to manipulate the viewport using the Alt key.

class TestTemplate(object):
    _drawable_geo = hou.Geometry()
    circle = hou.sopNodeTypeCategory().nodeVerb("circle")
    circle.setParms({ "type": 2 })
    circle.execute(_drawable_geo, [])
    del circle

    def __init__(self, scene_viewer, state_name):
        self.scene_viewer = scene_viewer
        self.state_name = state_name

        self._drawable = hou.SimpleDrawable(self.scene_viewer, self._drawable_geo, "test_drawable")

    def onGenerate(self, kwargs):
        self._drawable.enable(True)
        self._drawable.show(True)
        
        self.scene_viewer.curViewport().draw()


# UNREGISTER
if hou.ui.isRegisteredViewerState('test_state'):
    hou.ui.unregisterViewerState('test_state')        

# CREATE AND REGISTER
template = hou.ViewerStateTemplate('test_state', 'Test State', hou.sopNodeTypeCategory())
template.bindFactory(TestTemplate)
hou.ui.registerViewerState(template)

# ACTIVATE
scene_viewer = hou.ui.paneTabOfType(hou.paneTabType.SceneViewer)
scene_viewer.setCurrentState("test_state")

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mabelzile: Staff; 396 posts; Joined: Feb. 2018; Offline

Jan. 5, 2020 1:53 p.m.

It works fine in H18 with this python state file version:

import hou
import viewerstate.utils as su

class State(object):
    _drawable_geo = hou.Geometry()
    circle = hou.sopNodeTypeCategory().nodeVerb("circle")
    circle.setParms({ "type": 2 })
    circle.execute(_drawable_geo, [])
    del circle

    def __init__(self, scene_viewer, state_name):
        self.scene_viewer = scene_viewer
        self.state_name = state_name

        self._drawable = hou.SimpleDrawable(self.scene_viewer, self._drawable_geo, "test_drawable")

    def onGenerate(self, kwargs):
        self._drawable.enable(True)
        self._drawable.show(True)
        
        #self.scene_viewer.curViewport().draw()

def createViewerStateTemplate():
    """ Mandatory entry point to create and return the viewer state 
        template to register. """

    state_typename = "z"
    state_label = "Z"
    state_cat = hou.sopNodeTypeCategory()

    template = hou.ViewerStateTemplate(state_typename, state_label, state_cat)
    template.bindFactory(State)
    template.bindIcon("MISC_python")


    return template

Tools:

import stateutils as su

viewer = su.findSceneViewer()
viewer.setCurrentState("z")

Edited by mabelzile - Jan. 5, 2020 13:53:40


Alexey Vanzhula: Member; 538 posts; Joined: Dec. 2006; Offline

Jan. 5, 2020 2:11 p.m.

mabelzile
It works fine in H18 with this python state file version:

import hou
import viewerstate.utils as su

class State(object):
    _drawable_geo = hou.Geometry()
    circle = hou.sopNodeTypeCategory().nodeVerb("circle")
    circle.setParms({ "type": 2 })
    circle.execute(_drawable_geo, [])
    del circle

    def __init__(self, scene_viewer, state_name):
        self.scene_viewer = scene_viewer
        self.state_name = state_name

        self._drawable = hou.SimpleDrawable(self.scene_viewer, self._drawable_geo, "test_drawable")

    def onGenerate(self, kwargs):
        self._drawable.enable(True)
        self._drawable.show(True)
        
        #self.scene_viewer.curViewport().draw()

def createViewerStateTemplate():
    """ Mandatory entry point to create and return the viewer state 
        template to register. """

    state_typename = "z"
    state_label = "Z"
    state_cat = hou.sopNodeTypeCategory()

    template = hou.ViewerStateTemplate(state_typename, state_label, state_cat)
    template.bindFactory(State)
    template.bindIcon("MISC_python")


    return template

Tools:

import stateutils as su

viewer = su.findSceneViewer()
viewer.setCurrentState("z")

Houdini 18.0.340 Linux. The drawable appear only after moving the mouse. Test it from the Python Source Editor.

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Alexey Vanzhula: Member; 538 posts; Joined: Dec. 2006; Offline

Jan. 5, 2020 2:19 p.m.

But it works fine when I use executeDeferred, but with a very small delay:

viewer = su.findSceneViewer()
viewer.setCurrentState("z")
hdefereval.executeDeferred(viewer.curViewport().draw)

Edited by Alexey Vanzhula - Jan. 5, 2020 14:19:43

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