Find water's surface with trace

[c👌de_g🎷]

How can I find where air changes to water and vise-versa? I tried using a combination of trace masks, but I couldn't find anything that would void out empty space.

[Kiro The Pro]

That's odd, you should be able to use traces, like a player's eyetrace.

 
bit.band( util.PointContents( track.HitPos ), CONTENTS_WATER ) == CONTENTS_WATER

where table:[I]track[/I] is a trace result. [Returns true if the hit position's water]

[c👌de_g🎷]

But that doesn't return where the trace changes from water to empty space. That just says if the trace ended in water.

[typedef state]

[lua]
local trace = {
start = LocalPlayer():EyePos(),
endpos = LocalPlayer():EyePos() + LocalPlayer():EyeAngles():Forward() * 60000,
filter = LocalPlayer(),
mask = CONTENTS_WATER
}

trace = util.TraceLine(trace)
[/lua]

This seems to work for me, but it doesn't detect the edge if the trace starts in water. You can try doing a reverse trace if it doesn't hit anything.

It seems to only hit water, and ignores world entirely.

[c👌de_g🎷]

[QUOTE=typedef state;50767835][lua]
local trace = {
start = LocalPlayer():EyePos(),
endpos = LocalPlayer():EyePos() + LocalPlayer():EyeAngles():Forward() * 60000,
filter = LocalPlayer(),
mask = CONTENTS_WATER
}

trace = util.TraceLine(trace)
[/lua]

This seems to work for me, but it doesn't detect the edge if the trace starts in water. You can try doing a reverse trace if it doesn't hit anything.

It seems to only hit water, and ignores world entirely.[/QUOTE]

Yeah, I was trying to figure out how to do it from the water. I guess tracing backwards is the best way.