We can apply thickness to most linear 2D entities and also create linear 3D entities like 3D polylines and splines.
Almost all linear entities that we know from 2D have a property called Thickness, whose value represents a height along the Z axis (a better word actually should be height). This is the only 3D feature available in AutoCAD LT and can be applied to text (if made with a text style that uses an SHX font), but beyond that is quite limited.
The best way to change the value of thickness is with the
PROPERTIES command, Ctrl + 1. A line is still a line or a text still text, but with a proper visualization, these entities can transmit a 3D feeling:
Polylines created with the
PLINE command are 2D, not ...