layers/craters/degradation/state.h

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1			/// @file
2			/// @brief A crater's shape measures and degradation state.
3			#pragma once
4
5			#include <functional>
6
7			namespace terraingen {
8
9			/// A crater's shape measures relative to its diameter.
10			struct CraterMorphometry {
11		11	double depthRatio = 0.0; ///< Rim-to-floor depth / diameter.
12		11	double rimHeightRatio = 0.0; ///< Rim height above the pre-impact surface / diameter.
13
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15			};
16
17			/// A crater's degradation state: its morphometry when fresh and now.
18			struct CraterState {
19		2	CraterMorphometry fresh; ///< When fresh; some profiles place a degraded rim from it.
20		2	CraterMorphometry current; ///< Now; profiles shape the crater to it.
21			/// Diffusion age over diameter squared, kappa t / D^2, for profiles that diffuse the fresh
22			/// shape (`DiffusedProfile`); 0 for none.
23		2	double diffusion = 0.0;
24
25			/// How fresh the crater looks: its depth now over its depth when fresh; 1 for a fresh crater
26			/// (or one with no fresh depth), falling as it degrades.
27		309448	double Freshness() const {
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29			}
30
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32			};
33
34			/// The morphometry of a fresh crater of a diameter (m) on some body, such as
35			/// `LunarFreshCraterMorphometry`; must be thread-safe.
36			using FreshMorphometry = std::function<CraterMorphometry(double diameter)>;
37
38			} // namespace terraingen
39

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