Remove the white background of a symbol when outputting using OpenCascade's AIS_Textlabel?

[Aleksandr34nov]

Hello everyone, I'm implementing a program for working with shapes using OpenCascade. Please help me remove the white background around a symbol when outputting symbols using OpenCascade's AIS_Textlabel. How can I remove the white background around a symbol?Or is there another way to display text on the stage so that it lies in the plane of the size and does not turn towards the camera when the camera rotates and does not change size when zooming? This is my code:

label = AIS_TextLabel()
label.SetText(str(text))
label.SetPosition(gp_Pnt(*position))
label.SetHeight(height)
label.SetDisplayType(1)

label.SetHJustification(Graphic3d_HTA_CENTER)
label.SetVJustification(Graphic3d_VTA_CENTER)

if hasattr(label, "SetBackdrop"):
    label.SetBackdrop(False)

color_obj = Quantity_Color(*color, Quantity_TOC_RGB)
label.SetColor(color_obj)

self._context.Display(label, False)

I want to remove the white rectangle around the number one:

[gkv311]

This line:

label.SetDisplayType(1)

assigns Aspect_TODT_SUBTITLE style to the label, which indeed adds filled background rectangle.
Just remove this line to use Aspect_TODT_NORMAL, which is default one.

You may also try other label styles from Aspect_TypeOfDisplayText enumeration (tip - avoid using numbers instead of named enumeration values):

label.SetDisplayType(Aspect_TODT_SHADOW)
label.SetColorSubTitle(Quanitity_Color(Quanitity_NOC_BLACK))

From OCCT test opengl text A7:

[Aleksandr34nov]

Thank you very much, it works.
Could you please tell me how to make sure the text displayed (using AIS_Textlabel) doesn't rotate when the camera is facing it and always stays within the display size?
And could you also please tell me how to make sure the text displayed using AIS_Textlabel doesn't change size when the camera zooms in?

My OCC version is 7.9.0

If I use this code, it doesn't work and the index keeps rotating and zooming when zoomed in:

label = AIS_TextLabel()
label.SetText(str(text))

pnt = gp_Pnt(float(position[0]), float(position[1]), float(position[2]))
label.SetPosition(pnt)

trsf_pers = Graphic3d_TransformPers(Graphic3d_TMF_ZoomPers, pnt)
label.SetTransformPersistence(trsf_pers)
    
label.SetHeight(25.0)

color_obj = Quantity_Color(color[0], color[1], color[2], Quantity_TOC_RGB)
if hasattr(label, "SetColor"):
    label.SetColor(color_obj)

self._context.Display(label, update)

I also tried this option with SetIsZoomable and SetZoomable, but it didn't work either and I got an error('Graphic3d_AspectText3d' object has no attribute 'SetIsZoomable'):

drawer = text_label.Attributes()
text_aspect = drawer.TextAspect()

try:
    text_aspect.SetIsZoomable(False)
except AttributeError:
    text_aspect.Aspect().SetIsZoomable(False)

text_label.SetHeight(20.0)

I want the output text "1" to lie in the size plane and not turn towards us while the camera is moving, and so that it does not change its size when the camera zoom changes.
In the first photo, the text is rotated, in the second photo, the magnification is "1" when the camera is moving away.:

[gkv311]

I also tried this option with SetIsZoomable and SetZoomable, but it didn't work either and I got an error('Graphic3d_AspectText3d' object has no attribute 'SetIsZoomable'):

AIS_TextLabel.SetZoomable() works in my version of pythonocc, make sure you are using the correct syntax:

label = AIS_TextLabel()
...
label.SetZoomable(False)

But AIS_TextLabel is designed to draw a fixed-size textured text, so that text appearance will be poor.
You might want to create a tessellated text instead using tool StdPrs_BRepTextBuilder (which creates TopoDS_Shape from the given font and text) and display it as a regular AIS_Shape:

from OCC.Core.Addons import *
from OCC.Core.AIS import *

brepText: TopoDS_Shape = text_to_brep("My Text", "Arial", Font_FontAspect_Regular, 16.0, False)
textPrs: AIS_Shape = AIS_Shape(brepText)

aDisplay.Context.Display(textPrs, False)

You may adjust AIS_Shape presentation properties as you like (like changing color, disabling lighting via Graphic3d_TypeOfShadingModel_Unlit) and assign transformation persistence (Graphic3d_TransformPers assigned via AIS_InteractiveObject.SetTransformPersistence() - I don't quite understand which persistence you actually want to apply).

[Aleksandr34nov]

Thanks for the advice. And please tell me, when implementing text output via StdPrs_BRepTextBuilder and TopoDS_Shape, is it possible to make the text rotate and read from left to right relative to our camera view and not be fixed and reflected, but at the same time so that the size of the text does not change with zoom? How can this be implemented?

I also tried this option with SetIsZoomable and SetZoomable, but it didn't work either and I got an error('Graphic3d_AspectText3d' object has no attribute 'SetIsZoomable'):

AIS_TextLabel.SetZoomable() works in my version of pythonocc, make sure you are using the correct syntax:

label = AIS_TextLabel()
...
label.SetZoomable(False)
But AIS_TextLabel is designed to draw a fixed-size textured text, so that text appearance will be poor. You might want to create a tessellated text instead using tool StdPrs_BRepTextBuilder (which creates TopoDS_Shape from the given font and text) and display it as a regular AIS_Shape:

from OCC.Core.Addons import *
from OCC.Core.AIS import *

brepText: TopoDS_Shape = text_to_brep("My Text", "Arial", Font_FontAspect_Regular, 16.0, False)
textPrs: AIS_Shape = AIS_Shape(brepText)

aDisplay.Context.Display(textPrs, False)
You may adjust AIS_Shape presentation properties as you like (like changing color, disabling lighting via Graphic3d_TypeOfShadingModel_Unlit) and assign transformation persistence (Graphic3d_TransformPers assigned via AIS_InteractiveObject.SetTransformPersistence() - I don't quite understand which persistence you actually want to apply).

Thanks for the advice. And please tell me, when implementing text output via StdPrs_BRepTextBuilder and TopoDS_Shape, is it possible to make the text rotate and read from left to right relative to our camera view and not be fixed and reflected, but at the same time so that the size of the text does not change with zoom? How can this be implemented?