Screen Unit

There is a choice from 4 options:

• 3D - dmensions of text are defined in 3d space. Scaling from text units to 3d may be changed by Scale property. In this mode size of text may vary depending on distance to camera size of viewport.
• Pixels - size of text is screen pixels. Size of markup is constant in pixels.
• Points - size of text is points. Screen DPI may affect size of text. Size of markup should respect screen DPI.
• Screen - size of text is in thousandth of screen space. May be useful is size of markup should be in proportion to viewport size.