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> Unreal Engine API Reference > Editor > UnrealEd > ImportUtils > StaticMeshImportUtils::AddBoxGeomFromTris

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StaticMeshImportUtils::AddBoxGeomFromTris

Function for adding a box collision primitive to the supplied collision geometry based on the mesh of the box.

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Linux

References

Module	UnrealEd
Header	/Engine/Source/Editor/UnrealEd/Public/ImportUtils/StaticMeshImportUtils.h
Include	#include "ImportUtils/StaticMeshImportUtils.h"
Source	/Engine/Source/Editor/UnrealEd/Private/ImportUtils/StaticMeshImportUtils.cpp

Syntax

namespace StaticMeshImportUtils
{
    bool StaticMeshImportUtils::AddBoxGeomFromTris
    (
        const TArray< FPoly > & Tris,
        FKAggregateGeom * AggGeom,
        const TCHAR * ObjName
    )
}

Remarks

Function for adding a box collision primitive to the supplied collision geometry based on the mesh of the box.

We keep a list of triangle normals found so far. For each normal direction, we should have 2 distances from the origin (2 parallel box faces). If the mesh is a box, we should have 3 distinct normal directions, and 2 distances found for each. The difference between these distances should be the box dimensions. The 3 directions give us the key axes, and therefore the box transformation matrix. This shouldn't rely on any vertex-ordering on the triangles (normals are compared +ve & -ve). It also shouldn't matter about how many triangles make up each side (but it will take longer). We get the centre of the box from the centre of its AABB.

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