1.6 KiB
Materials: Commands
cull
Syntax
cull
Overview
Every surface of a polygon has two sides, a front and a back. Typically, we only see the front or "out" side. For example, a solid block you only show the front side. In many applications we see both. For example, in water, you can see both front and a back. The same is true for things like grates and screens.
To "cull" means to remove. The value parameter determines the type of face culling to apply. The default value is cull front if this keyword is not specified. However for items that should be inverted then the value back should be used. To disable culling, the value disable or none should be used. Only one cull instruction can be set for the material.
Sides
front
This is the default value. The front or "outside" of the polygon is
not drawn in the world. It is used if the keyword "cull " appears in
the content instructions without a value or if the keyword cull
does not appear at all in the shader.
back
Cull back removes the back or "inside" of a polygon from being drawn in the world.
none
Neither side of the polygon is removed. Both sides are drawn in the game. Very useful for making panels or barriers that have no depth, such as grates, screens, metal wire fences and so on and for liquid volumes that the player can see from within. Also used for energy fields, sprites, and weapon effects (e.g. plasma).
Design Notes: For things like grates and screens, put the texture with the cull none property on one face only. On the other faces, use a non-drawing texture.