RGB, Float values under pointer
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Arvid Schneider
Apr 7, 2014, 11:20:48 AM4/7/14
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Hey Group,
I am trying to return rgb/float values at the current pixel under the mouse pointer. How would you accomplish that?
The idea is, to press a button which enables the getColor method, so when I hover the mouse over mayas viewport (render view) and click MMB a rgb/float value is returned.
I couldnt find a way yet using Qt or python.
Maybe someone has an idea.
Arvid
Marcus Ottosson
Apr 7, 2014, 11:35:18 AM4/7/14
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Not sure about getting an arbitrary pixel regardless of what lies underneath the cursor, but if your looking to eye-drop an image within a Qt interface (which may be what the Render View is doing, I'm not sure), you can get the cursor position with QCursor.pos() and use that to determine a color within an image using QImage.pixel()
# Psuedo-code
current_position = QCursor.pos()
widget_under_cursor = QApplication.widgetAt(current_position)
relative_position = widget_under_cursor.mapFromGlobal(current_position)
color = my_image.pixel(relative_position) # Returns a QRgb object
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Justin Israel
Apr 7, 2014, 5:49:21 PM4/7/14
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For all areas of the application that are not the 3D viewport, you can render the widget to an image in memory and then query the color under the cursor:
#-------
globalPos = QtGui.QCursor.pos()
widget = QtGui.QApplication.widgetAt(globalPos)
img = QtGui.QImage(widget.size(), QtGui.QImage.Format_ARGB32)
widget.render(img)
pos = widget.mapFromGlobal(globalPos)
color = QtGui.QColor.fromRgb(img.pixel(pos))
#-------
But getting the color sample from the viewport is trickier because it is an OpenGL display and you have to use a different method (Maybe there is a better way than this):
#-------
import tempfile
import maya.OpenMaya as om
import maya.OpenMayaUI as mui
tmp = tempfile.NamedTemporaryFile()
globalPos = QtGui.QCursor.pos()
widget = QtGui.QApplication.widgetAt(globalPos)
view = mui.M3dView.active3dView()
img = om.MImage()
view.readColorBuffer(img, True)
img.writeToFile(tmp.name, "png")
qimg = QtGui.QImage(tmp.name)
pos = widget.mapFromGlobal(globalPos)
color = QtGui.QColor.fromRgb(qimg.pixel(pos))
#-------
-- justin
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Marcus Ottosson
Apr 8, 2014, 4:30:50 AM4/8/14
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Oo, that's excellent. I figure there must be a way to sample the whole screen, like hitting Print Screen, and using that for eye-dropping.
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Arvid Schneider
Apr 8, 2014, 4:33:25 AM4/8/14
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Hey Guys,
Thank you very much for your Input Marcus and Justin,
I am currently working on a viewport render, and it would be great to be able query the rendered image color values.
Thanks for the help, ill keep you updated
Arvid
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