GrassTrample

from acron.vegetation import GrassTrample

class GrassTrample

Bases:

Bases: TypedReferenceCount

Where the grass has been trodden or driven over: a square map of `size` texels over `extent` metres that follows a centre (a camera, a player, a vehicle) in whole texels, so what was stamped stays put in the world while the map moves. A texel holds the push direction (x, y) and how flat the grass is (0..1); flat grass recovers over `recovery` seconds. The grass shader reads it as an RGBA16F texture. At most MAX_SIZE texels a side; non-finite arguments are rejected with an error.

Inheritance diagram

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__init__()

A map of size x size texels over extent x extent metres, centred on the origin until set_center() moves it.

clear()

static get_class_type()

get_extent()

get_flatness()

How flat the grass is at (x, y) (0 outside the map).

get_origin()

The world position of the map’s south-west corner.

get_size()

property origin → LPoint2f

The world position of the map’s south-west corner.

recover()

Lets the grass stand up again: flatness falls to nothing over `recovery` seconds.

set_center()

Centres the map on (x, y), scrolling what it holds by whole texels.

stamp()

Flattens the grass in a disc (a soft edge over its outer third), pushing it along (dir_x, dir_y) – or away from the centre when that is zero. Stamps keep the flattest value.

write_texture()

The map as an RGBA16F texture (rows south to north): rg the push direction, b the flatness.