# Collision computation

Determine if there are interferences between parts from an assembly.

This functionality allows to determine if there are interferences (clashes) between parts from an assembly, and if a specified clearance distance is verified between parts (clearance analysis).

Depending on the nature of the analysis, one or two groups can be defined:

- One group: the analysis is processed on all the selected parts that are included in the group.
- Two groups: the analysis is processed between the two groups, but not inside the groups.

Parameters

> pGroup1: define the first group of `A3DTransfoRepresentationItemData`.

> pGroup2: define a optional second group of `A3DTransfoRepresentationItemData`.

> pParameterData: set parameters for collision computation.

> uCollisionResultsSize: Number of `A3DCollisionResultData`in pCollisionResults.

> pCollisionResults: Array of `A3DCollisionResultData`, containing collision computation result. pCollisionResults is automatically allocated by A3DCollisionCompute.

Returns

> `A3D_SUCCESS`on success, or an error code on failure

Structures

- `A3DTransfoRepresentationItemData`
- `A3DCollisionGroupData`
- `A3DCollisionParameterData`
- `A3DCollisionResultData`

Enumerations

- `A3DECollisionType`

Functions

- `A3DCollisionCompute()`

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