func_water_analog
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| CFuncMoveLinear |
| func_movelinear.cpp
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func_water_analog is a brush entity available in all 
Source games. It's a version of func_movelinear slightly specialized for use as water.
Important:Does not work with the Water shader.Refract can be used as a workaround for dynamic refraction with cubemapped reflections, although Valve does not provide any materials which do this.
Existing materials which are compatible include:
nature/water_movingplane.vmt(LightmappedGeneric)nature/water_dx70.vmt(LightmappedGeneric)nature/hazard_liquid.vmt(LightmappedGeneric) (only in
)liquids/!greenslime.vmt(UnlitTwoTexture) (only in
)
Confirm:Does the Water shader work if using cubemap reflections and refractions, instead of the real-time versions? This would still be beneficial for the ability to have two normal maps scrolling in different directions.
Bug:Water must be part of the world in 
Left 4 Dead series otherwise it doesn't work properly and acts as non-solid brush.
Note:The SetPosition input and Start Position keyvalue do not perform any bounds checking, so values less than 0 and greater than 1 can be used. Negative values will move in the opposite direction to the movement direction, and values greater than 1 will move it in multiples of the set Move Distance. Moving past the opened/closed position does not trigger the OnFullyOpen and OnFullyClosed outputs.Bug:There are bugs that may arise when parenting this entity to any of these: func_movelinear, func_lookdoor, func_water_analog. A func_door (or for func_water_analog, func_water) can be used as a workaround. (see here for a code fix)[
Code Fix]
Confirm:Might be fixed in Portal 2? Parented movelinears are used extensively for this game's piston platforms.Bug:In 
Black Mesa, if this entity uses multiple brushes, VPhysics objects work incorrectly with this entity (the same for func_water). It looks like they are using BBox of this entity to calculate physics, instead of using brushes. This issue can be found in Interloper chapter. Separate water into several separate entities to avoid this bug.
Code:Both func_water_analog and func_movelinear are linked to CFuncMoveLinear C++ class. The game code checks the classname KV to distinguish between them.Keyvalues
- Water Material (WaterMaterial) <material> (only in )
- The material to derive water information from. Determines $underwateroverlay that use func_water_analog.
- Bug:Don't work after reload. You still can repeat this effect with trigger and env_screenoverlay.
- Wave Height (WaveHeight) <string> (only in )
Note:Other Keyvalues / Inputs / Outputs are same as func_movelinear.