I have an "info_target" point entity in the func_water brush entity and I want to discover a point in the Z axis that is right above the boundaries of func_water entity the "info_target" entity is in. So the X and Y coords for this point would be the same as "info_target" and Z coords would've been right above the water model - not the water origin point, but the whole water model.

Hope you did understand.
[IMG]http://img192.**************/img192/862/lolz1y.png[/IMG]
My first thought would be getting the index and then origin of the func_water the info_target is in, then getting the entity size and adding "entity z size /2" to the z coord of func_water.
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