Halo Weather Poly Tutorial .pdf

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Halo Weather Polyhedron Tutorial
By DSalimander (with love)
Be advised that a lot of terminology used in this tutorial is aimed at
people who have an already in-depth knowledge of the Halo 1 BSP creation

Weather polyhedra are used by Halo to define volumes in a BSP
where weather particles such as snow, rain, and swamp bugs cannot
spawn. This technique is frequently used in the Halo 1 campaign where you
transition from interior sections to outside sections with weather. Without
weather polyhedra, going from an interior cluster to an exterior cluster with
weather would cause the weather to just instantly appear, which isn't

There is little explanation offered as to how these work. Tool offers no
failure/success information when you attempt to implement them. And the
icing on the cake: you can't even view these in Sapien like you can with
portals. The only evidence to go off of is the information Guerilla offers on
some of the single player BSPs in question, and a really unhelpful
description offered by the HEK tutorial.

Going by what the HEK tutorial says, you could assume these work in
a similar fashion to occlusion portals; but, Guerilla gives a few extra hints
that we aren't simply dealing with flat polygons- we are dealing with actual
3D volumes. It's unclear exactly what is accepted by Halo as a polyhedron;
the definition of a polyhedron is a solid figure with many plane faces,
typically more than six. (Source: Google) After reviewing the average
amount of planes per weather polyhedron in the campaign maps, I've
drawn the conclusion that these must be simple primitives such as cubes.
I've experimented with using more complex volumes and experienced a lot
of failures. If needed, the simple cube volumes can intersect to form larger,
more complex volumes.
To make your own weather polyhedra, you must add a material to
your BSP model (in 3DS Max) called +weatherpoly. Assign this material to
your sealed simple volumes, export and compile the BSP, then open the
level in Sapien. These volumes are intended to encapsulate halls and
rooms and therefore will intersect BSP geometry, which is perfectly normal.
Understand that you must apply weather effects to clusters that may
normally not have them, so they appear outside a window or doorway, as
you stand within a weather polyhedron. The only clusters that will not
receive the weather particle cluster information are clusters that have no
line of sight to the exterior. Just keep these two facts in mind:
1. Weather particles will spawn everywhere, if you're in a cluster that has
them enabled. However...
2. Weather particles will not spawn inside weather polyhedra.

Here is a demonstration of weather polyhedra in 3ds Max on a port of Halo
2 Lockout. The level needs to have nice transitions between indoor areas
and outdoor areas with snow.

Here are the weather polyhedra that need to be implemented to keep snow
out of the indoor areas. As you can see, some intersect each other, and
some aren't perfect cubes. These have been tested and work fine.

This is what the scene looks like as it's ready to be

A common problem you may encounter relates to weather particles
seemingly phasing through walls in areas where they shouldn't be. There
are a few things to consider like the size of the weather particles, how
strong the wind is, etc. Those are possible sources of problems, but the
easiest solution is to simply enlarge the weather polyhedra sizes. The
example above isn't exactly the intended use of weather polyhedra, I
suspect. I beleive they're mainly intended to be used at transition points in a
linear level where there are long hallways that open up to exterior areas. In
those situations, theres no chance of particles bleeding through walls since
you can enlarge the weather polyhedron as big as you want outside the
sealed BSP.
One last thing of note, if you want to be a nice guy and include
weather polyhedra in your map even though you don't intend to use any
weather particle systems, that's very helpful for anybody who wants to mod
your map and add weather particle systems in the future.

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