StaticMeshImportUtils::AddBoxGeomFromTris

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Unreal Engine C++ API Reference > Editor > UnrealEd > ImportUtils

References

namespace StaticMeshImportUtils  
{  
    bool StaticMeshImportUtils&58;&58;AddBoxGeomFromTris  
    &40;  
        const TArray< FPoly > & Tris,  
        FKAggregateGeom &42; AggGeom,  
        const TCHAR &42; ObjName  
    &41;  
}  
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namespace StaticMeshImportUtils {     bool StaticMeshImportUtils&58;&58;AddBoxGeomFromTris     &40;         const TArray< FPoly > & Tris,         FKAggregateGeom &42; AggGeom,         const TCHAR &42; ObjName     &41; }

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.