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 # Class IRockyTimestepData

 Last update: 09.03.2026 

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![](https://img.shields.io/badge/language-C%2B%2B-blue "C++")![](https://img.shields.io/badge/-public-brightgreen "public")

**\#include &lt;rocky\_timestep\_api.h&gt;**

An `<a href="classIRockyTimestepData.md#classIRockyTimestepData">IRockyTimestepData</a>` object provides the data and methods needed to estimate a stable simulation timestep when a module implements a custom contact force model. The class `<a href="classIRockyTimestepData.md#classIRockyTimestepData">IRockyTimestepData</a>` inherits all public methods of the class `<a href="classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData">IRockyInteractionCalculationsData</a>`.

**Inherits from**:

- [IRockyInteractionCalculationsData](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData)

## Members

- [get\_geometry\_material\_index](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData_1a05cb28a940233bc976b806a5893c639c)
- [get\_loading\_n\_steps](classIRockyTimestepData.md#classIRockyTimestepData_1a3a8aecd285747c87e9987fd439a14a3b)
- [get\_material](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData_1a609eb08b9a568e07c35953bd616d9551)
- [get\_material\_interaction](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData_1aeb94fd8ed1f75bd0523634285ad94e4d)
- [get\_material\_interaction\_index](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData_1a1cf7ad2b906aa2f033494b390522bbb3)
- [get\_number\_geometry\_materials](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData_1a986da6321cca08d20d20dbd43962a74a)
- [get\_number\_particle\_groups](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData_1ab5fb8e3d498bfc78f116eec7b53b22b8)
- [get\_particle\_material\_index](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData_1a700a3993ce6c50786c1323e0b91a7c3a)
- [get\_particle\_max\_sieve\_size](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData_1ac12016128279790932537b32c1c7410d)
- [get\_particle\_min\_mass](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData_1a641adbab81c6c430aa1b0eae6eff29f4)
- [get\_particle\_min\_sieve\_size](classIRockyInteractionCalculationsData.md#classIRockyInteractionCalculationsData_1a1ce09b00f677c903a2d25426f8447300)

## Public functions

### Function get\_loading\_n\_steps

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![](https://img.shields.io/badge/-public-brightgreen "public")![](https://img.shields.io/badge/-const-lightblue "const")

```cpp
int IRockyTimestepData::get_loading_n_steps() const

```

**Returns**:

The minimum number of timesteps that the loading period of the shortest collision in a simulation can have. This is a parameter whose value is specified through the Rocky UI.

**Return type**: int