[vtkusers] How to draw a raster text strings at a 3D positon?

[chensq]

Hi, vtkers.
I can draw vector text strings at any 3D position. But it changes its size when zooming. This is undesirable sometimes.
Can anyone suggest me how to draw a fixed-size text string (e.g. raster text strings) at a 3D postion?
Thank you in advance.
Sincerely Chen.
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