Best way to get Z value via X Y

[SwInY]

Hey Guys,

today i have spent a good part of the day trying to figure out how to get the Z value of a input of X Y.
i am in process via end scene hook but im guessing its not gunna be as easy as i want it to be.

i dont want to have to build a full NavMesh with recast and wowmapper,
or is this the ONLY way?

i have been looking at examples of the NavMesh, and to be honest i cannot stand c++.
so i dont want to have to go down that path of trying to learn it

trying to get some advice of people

[Jadd]

Search WorldToScreen, there are like 1000 threads about it. Really simple stuff.

[SwInY]

i have 4 results in search. care to elaberate a bit more ? function inside that function ?
just done a massive search, can find heaps of world to screen on XYZ, nothing about getting Z value.

[Sacred]

If you want to build path in your waypoint manager for a full zone and get Z value for every waypoint, your only way to use RD and get poly height.
Yes, it's possible to get Z value with CGWorldFrame__Intersect, but in your case it's useless.

[Bananenbrot]

Intersection of Rays/Segments with Triangles

[Jadd]

Oh, you're trying to get world coordinates from screen coordinates? My bad, WorldToScreen won't help you. Try and be a bit clearer next time you ask for help.

[namreeb]

I agree the question is ambiguous, but my guess is that he's trying to get the terrain height at a given (x, y) position. The answer is that you don't need a navmesh at all, but you will probably want to employ a parser (I'm pretty sure there is at least one public domain open source parser out there). The reason it is not so simple is that a given (x, y) may have a "standable floor" at multiple Z's, and you'll need to be able to enumerate them, and distinguish them from one-another.

[hamburger12]

Just use traceline (World intersect)

[SwInY]

thanks all for the replys, ive tryed using traceline to build my waypoint system,
but i need to build it for whole zone.

im starting to think i need to build a nav system.

[namreeb]

Again, you don't need a navigation system. You basically just need a parser and a method for querying it.

[SwInY]

thats what i ment, start of navmesh system. getting the needed files from wow. im guessing using wowmapper, then get z value some how.

[Kirth]

Represent X and Y as vectors; OX x OY = OZ?

[Bananenbrot]

Represent X and Y as vectors; OX x OY = OZ?

Even assuming x is the cross product... no.
Like I posted, cast a ray along (x, y, z) where z is element of a known interval and record the intersection point. Thats called a ray-triangle intersection.
That's what "traceline" does, so you might even easier call that one.

[Kirth]

What's wrong with my crossproduct? :'(

[telcy007]

I draw a little pic for you. You should start with a z-value of 1000 and go down in 200-packs, because
traceline has a limit.




EDIT:
A cross product produces only an orthogonal vector. But this may lie elsewhere.