[SOLVED] Draw vectors directly to 3D view using pivy + python

[kbwbe]

Hi,

i need to know how to draw vectors (complete arrow from a 3D Point to another, with color) directly to 3D view by python, also how to delete them later.
Does someone have a small sample ?

Thanks in advance.

[Kunda1]

This sounds like something @joel_graffs pivy-trackers project can do.

[Kunda1]

This sounds like something @joel_graffs pivy-trackers project can do.

[HakanSeven12]

You can build an arrow by using lines. Here is my code to create lines.

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        # Contour features.
        cont_color = coin.SoBaseColor()
        cont_color.rgb = (1, 1, 0)
        cont_coords = coin.SoCoordinate3()
        cont_lines = coin.SoLineSet()

Then

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        cont_coords.point.values = pointlist

Then

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        # Contour root.
        contours = coin.SoSeparator()
        contours.addChild(cont_color)
        contours.addChild(cont_coords)
        contours.addChild(cont_lines)

Finally

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        sg = FreeCADGui.ActiveDocument.ActiveView.getSceneGraph()
        sg.addChild(contours)

[kbwbe]

Thank you very much, will try that.

[HakanSeven12]

You are welcome. If you want to easily manage this view objects, I recommend you to create a feature python object.

[kbwbe]

Thanks again. Your code helped very much.

I got it running, final script was:

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import FreeCADGui
import FreeCAD
from PySide import QtGui
from PySide import QtCore

from pivy import coin

#setup the contour
color = coin.SoBaseColor()
color.rgb = (1, 0, 0)

points=coin.SoCoordinate3()
lines=coin.SoLineSet()

points.point.values = ( (0,0,0),(10,10,10),(10,10,0) )


#feed data to separator
sep=coin.SoSeparator()
sep.addChild(points)
sep.addChild(color)
sep.addChild(lines)

#add separator to sceneGraph
sg = FreeCADGui.ActiveDocument.ActiveView.getSceneGraph()
sg.addChild(sep)

If you want to easily manage this view objects, I recommend you to create a feature python object.

I just want to avoid setting up feature python objects, as i need the lines for graphical debugging of my A2plus solver. Running the solver will probably generate a very big number of vectors, which could be to heavy for the FC document.

[HakanSeven12]

You can draw them under one fpo but that is your decision also you can change line width. Add it separator before lineset.

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        # Line style.
        line_style = coin.SoDrawStyle()
        line_style.style = coin.SoDrawStyle.LINES
        line_style.lineWidth = 2

[kbwbe]

Setting lineStype was a very good hint. Lines with width 1 are hard to see on a highres screen. Thanks

[HakanSeven12]

You are welcome