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DP SV ENTITYCONTENTSTRANSITION
From Quake Wiki
Field definitions:
.void(float nOriginalContents, float nNewContents) contentstransition;
This field function, when provided, is triggered on an entity when the contents (ie. liquid / water / etc) is changed.
The first parameter provides the entities original contents, prior to the transition. The second parameter provides the new contents.
Note: If this field function is provided on an entity, the standard watersplash sound IS SUPPRESSED to allow for authors to create their own transition sounds.