MUIDrawManager text2D on top

[chaneyx]

How do I ensure that text2D draws on top of  all other elements? 

I am making a variant of MayaPluginForSpreticle which has letter box and text functionality. I thought I could modify draw order or push the glVertex3d z values away from camera for all non text elements but my text2D calls are going underneath the letter box masks. 

The GL_LINES are behaving as expected. But the GL_QUADS are not. 

Thank you

[cheng_xi_li · Accepted solution]

Hi,

MUiDrawManager::text2d and other 2d drawings should respect z component of MPoint for depth sorting. Please try to assign a z value for the input of MUiDrawManager::text2d like MPoint(x,y, -0.001) or other 2d drawings with (x,y,0.001).

Yours,

Li

[chaneyx]

This is helpful. 

Is there any way to draw on top of the Maya Camera's Gate Mask? My hope is to put informative text on top of it for playblasts. No z values seem to do this. 

Thanks

[cheng_xi_li]

Hi,

It is drawn after rendering, so z won't affect this. I've got two ideas for this.

1. Create a render override for the viewport.

You could get a standard viewport operation and modify the hud part with addUiDrawables. You could test this with viewRenderOverride in the devkit. Adding a MUiDrawManager::text2d in viewRenderHUDOperation::addUIDrawables should be able to let you draw text over gate masks.

2.Using Qt

Viewport is a QWidget, so you could add QLabel to it. e.g.

import maya.OpenMaya as om
import maya.OpenMayaUI as omui
import maya.cmds as cmds

from PySide2.QtCore import * 
from PySide2.QtGui import * 
from PySide2.QtWidgets import *
from shiboken2 import *

control = cmds.playblast(ae=True)
qwidget = omui.MQtUtil.findControl(control)

viewport = wrapInstance(long(qwidget), QWidget) 


label = QLabel(qwidget)
label.move(10,10)
label.setText("Test")
label.show()

But this method will have a background. I didn't find a good solution for this but it should be ok if you are drawing above gate masks.

Yours,

Li

[chaneyx]

I like the simple idea of the QT solution. 

The code snippet produces these errors : 

# Error: TypeError: file <maya console> line 12: 'PySide2.QtWidgets.QLabel' called with wrong argument types:
PySide2.QtWidgets.QLabel(SwigPyObject)
Supported signatures:
PySide2.QtWidgets.QLabel(PySide2.QtWidgets.QWidget = None, PySide2.QtCore.Qt.WindowFlags = Qt.WindowFlags())
PySide2.QtWidgets.QLabel(unicode, PySide2.QtWidgets.QWidget = None, PySide2.QtCore.Qt.WindowFlags = Qt.WindowFlags()) #

Which I think is simply fixed by using 

label = QLabel(viewport)  as opposed to (qwidget)

But I do not see the "Test" label anywhere. Where should I expect it to appear? 

Thank you, 

Chris 

[chaneyx]

Is the QT code that makes the viewport accessible like all the mel based UIs are?

I can modify that directly rather than trying to add elements to it after the fact. 

[cheng_xi_li]

Hi,

Yes, it is label = QLabel(viewport). It is on the top-left corner of viewport. I guess I made it wrong accidentally while cleaning up the code.

The code before qLabel should give you Qt access to the viewport widget. You could try otherways but it could be much harder and not working. Using a widget is the easist way to do that.

Yours,

Li

[chaneyx]

This seems to be a very straight forward solution. Unfortunately it is not working on my Mac OSX 10.13.1 with Maya 2018 but it is clearly working on your end. 

I will tinker with it unless you have some more ideas for possible solutions.

Thanks

[chaneyx]

[cheng_xi_li]

Hi,

It looks like viewport is drawing above the whole panel on the Mac. I was testing on windows, it was fine. I tried idea 1 and it works on Mac.

If you don't have to draw on the gate masks, maybe you could try to caclucate the geom of the film gate like spReticleLoc did and avoid drawing the text on the film gates.

Yours,

Li