Overrides the player's animation transparency parameters for current game tick. Useful for special effects.

Required parameters:

- trans = trans_type (string)
  trans_type must be one of the following:
  - default - does nothing
  - none - disables transparency
  - add - draws with additive transparency (alpha defaults to 256,256)
  - addalpha - deprecated in 1.1; draws with additive transparency (alpha defaults to 256,0)
  - add1 - deprecated in 1.1; draws with additive transparency (alpha defaults to 256,128)
  - sub - draws with full subtractive transparency (alpha is fixed at 256,256)

Optional parameters:

- alpha = source_alpha, dest_alpha (int, int)
  These are the source and destination alpha values for the add trans types. Valid values are from 0 (low) to 256 (high). If omitted, default depends on trans_type.

Examples:

`; Fades the character in, over 256 ticks.
type = Trans
trigger1 = time < 256
trans = add
alpha = time, 256-time`