From Valve Developer Community
- Render Mode
- Set a non-standard rendering mode on this entity. See Render Modes for details.
- FX Amount (0 - 255)
- Intensity of the selected render mode.
- FX Color (R G B)
- Color used by the selected render mode (if applicable).
- Disable Receiving Shadows
- Prevents the entity from receiving shadows.
- Render FX
- Several GoldSrc-era visibility modes which change the way the entity is rendered, typically by fading it in and out.