threshold in text glyph
test regular field -> text glyph -> viewer 3D
In test regular field choose 3D. In text glyph choose glyph size component Trig function, glyph threshold component Trig function, threshold=0.5. In the viewer there are shown values below 0.5. See file. textglyph
It seems that there ist no problem when data are transformed by regular to irregular field. If text glyph is connected and the same parameters as above are choosen, there do not appear values below 0.5.