Doomsday Engine

Model definitions should be able to trigger Doomsday Script that then modifies the model's appearance or animation state. This enables the model definitions to react much better to what is taking place in the game world.

The original feature request is in terms of the old v1 model renderer:

This feature is intended to extend the Selector
mechanism of model definitions.

1. Game uses read-only (or runtime) cvars to store
information about the local player (health, armor,
current weapon, ammo, etc.)

2. Model def has a Condition key:

Condition = "player-health < 50 AND player-armor > 50";

3. The def is only used if the condition evaluates to true.

This is probably only applicable to the local player
(netgames!).