Well, my problem is following, I have a non-solid thing, some sort of sign floating above the ground. I clearly remember that in previous version(s) of Vavoom when I put this thing on a rasing platform, the thing raised and lowered with that platform normally, but now something changed and it does not lower; more, when raised it becomes clipped in platform, i.e. something prevents it from maintaining strict height above the ground. Thing is a simple Actor, two extra flag changes are bSolid = false and bFloatBob = true, nothing else. I looked into inventory actors that DO maintain the height and tried to set bSpecial flag to my actor; it worked but then every time player approaches this thing, he bumps into it and stuck for a moment like it's something solid (he may then continue passing through). What can be a workaround here?

Try using the "bFloorClip = true" and/or the "bNoGravity = false" flags. Tell us if this works for you <!-- s:-) --><img src="{SMILIES_PATH}/icon_smile.gif" alt=":-)" title="Smile" /><!-- s:-) -->

Nope, nothing helps. At the moment only way to fix that is to give up the FloatBob property.

Can you post your code, please?

Which code? It was an actor with bFloatBob set to true and bSolid set to false, that's all.

Well, I solved this by implementing new flag, called it bFixedFloatZ, and overriding EntityEx::OnMapSpawn and EntityEx::Physics methods: fully duplicating them but adding couple of sections, here, if someone is ever interested - OnMapSpawn:

       ...
       if (mthing)
       {
              ...
      if (bFloatBob || bFixedFloatZ /* [CW] */)
	      {
			// Seed random starting index for bobbing motion
			FloatBobPhase = Random() * 256.0 / 35.0;
			Special1f = mthing->height;
	      }
       }

Physics:

       ...
	if (!bFloatBob && !bFixedFloatZ)
	{
		UpdateVelocity();
	}
	...
	
	if (bFloatBob && bSpecial)
	{
	....
	}
	else if (bFixedFloatZ /* [CW] here it goes */)
	{
		if (Sector->bHasExtrafloors)
		{
			//	Make sure FloorZ is from bottom region.
			Origin.z = ONFLOORZ;
			LinkToWorld();
		}
		Origin.z = FloorZ + Special1f;
	}

What version has this issue? Because i try this on 1.26 and dont have this problem.

1.29