FGeomTools Namespace Reference

Functions
ENGINE_API void	GetClippableStaticMeshTriangles (TArray< FClipSMTriangle > &OutClippableTriangles, const UStaticMesh *StaticMesh)
ENGINE_API void	ClipMeshWithPlane (TArray< FClipSMTriangle > &OutTris, TArray< FUtilEdge3D > &OutClipEdges, const TArray< FClipSMTriangle > &InTriangles, const FPlane &Plane)
ENGINE_API void	ProjectEdges (TArray< FUtilEdge2D > &Out2DEdges, FMatrix &ToWorld, const TArray< FUtilEdge3D > &In3DEdges, const FPlane &InPlane)
ENGINE_API void	Buid2DPolysFromEdges (TArray< FUtilPoly2D > &OutPolys, const TArray< FUtilEdge2D > &InEdges, const FColor &VertColor)
ENGINE_API bool	TriangulatePoly (TArray< FClipSMTriangle > &OutTris, const FClipSMPolygon &InPoly, bool bKeepColinearVertices=false)
ENGINE_API FClipSMPolygon	Transform2DPolygonToSMPolygon (const FUtilPoly2D &InTri, const FMatrix &InMatrix)
ENGINE_API void	GeneratePlanarFitPolyUVs (FUtilPoly2D &Polygon)
ENGINE_API void	GeneratePlanarTilingPolyUVs (FUtilPoly2D &Polygon, float TileSize)
ENGINE_API void	RemoveRedundantTriangles (TArray< FClipSMTriangle > &Tris)
ENGINE_API void	Split2DPolysWithPlane (FUtilPoly2DSet &PolySet, const FPlane &Plane, const FColor &ExteriorVertColor, const FColor &InteriorVertColor)
ENGINE_API bool	VectorsOnSameSide (const FVector3f &Vec, const FVector3f &A, const FVector3f &B, const float SameSideDotProductEpsilon=0.0f)
ENGINE_API bool	PointInTriangle (const FVector3f &A, const FVector3f &B, const FVector3f &C, const FVector3f &P, const float InsideTriangleDotProductEpsilon=0.0f)

Function Documentation

Buid2DPolysFromEdges()

void FGeomTools::Buid2DPolysFromEdges	(	TArray< FUtilPoly2D > &	OutPolys,
		const TArray< FUtilEdge2D > &	InEdges,
		const FColor &	VertColor
	)

Given a set of edges, find the set of closed polygons created by them.

ClipMeshWithPlane()

void FGeomTools::ClipMeshWithPlane	(	TArray< FClipSMTriangle > &	OutTris,
		TArray< FUtilEdge3D > &	OutClipEdges,
		const TArray< FClipSMTriangle > &	InTris,
		const FPlane &	Plane
	)

Take the input mesh and cut it with supplied plane, creating new verts etc. Also outputs new edges created on the plane.

GeneratePlanarFitPolyUVs()

void FGeomTools::GeneratePlanarFitPolyUVs

(

FUtilPoly2D &

Polygon

)

Does a simple planar map using the bounds of this 2D polygon.

Does a simple box map onto this 2D polygon.

GeneratePlanarTilingPolyUVs()

void FGeomTools::GeneratePlanarTilingPolyUVs	(	FUtilPoly2D &	Polygon,
		float	TileSize
	)

Applies tiling UVs to the verts of this polygon

GetClippableStaticMeshTriangles()

void FGeomTools::GetClippableStaticMeshTriangles	(	TArray< FClipSMTriangle > &	OutClippableTriangles,
		const UStaticMesh *	StaticMesh
	)

Extracts the triangles from a static-mesh as clippable triangles.

PointInTriangle()

bool FGeomTools::PointInTriangle	(	const FVector3f &	A,
		const FVector3f &	B,
		const FVector3f &	C,
		const FVector3f &	P,
		const float	InsideTriangleDotProductEpsilon = 0.0f
	)

Util to see if P lies within triangle created by A, B and C.

ProjectEdges()

void FGeomTools::ProjectEdges	(	TArray< FUtilEdge2D > &	Out2DEdges,
		FMatrix &	ToWorld,
		const TArray< FUtilEdge3D > &	In3DEdges,
		const FPlane &	InPlane
	)

Take a set of 3D Edges and project them onto the supplied plane. Also returns matrix use to convert them back into 3D edges.

RemoveRedundantTriangles()

void FGeomTools::RemoveRedundantTriangles

(

TArray< FClipSMTriangle > &

Tris

)

Given a set of triangles, remove those which share an edge and could be collapsed into one triangle.

Split2DPolysWithPlane()

void FGeomTools::Split2DPolysWithPlane	(	FUtilPoly2DSet &	PolySet,
		const FPlane &	Plane,
		const FColor &	ExteriorVertColor,
		const FColor &	InteriorVertColor
	)

Split 2D polygons with a 3D plane.

Transform2DPolygonToSMPolygon()

FClipSMPolygon FGeomTools::Transform2DPolygonToSMPolygon	(	const FUtilPoly2D &	InPoly,
		const FMatrix &	InMatrix
	)

Transform triangle from 2D to 3D static-mesh triangle.

TriangulatePoly()

bool FGeomTools::TriangulatePoly	(	TArray< FClipSMTriangle > &	OutTris,
		const FClipSMPolygon &	InPoly,
		bool	bKeepColinearVertices = false
	)

Given a polygon, decompose into triangles and append to OutTris.

Returns

true if the triangulation was successful.

Given a polygon, decompose into triangles and append to OutTris.

VectorsOnSameSide()

bool FGeomTools::VectorsOnSameSide	(	const FVector3f &	Vec,
		const FVector3f &	A,
		const FVector3f &	B,
		const float	SameSideDotProductEpsilon = 0.0f
	)

Given three direction vectors, indicates if A and B are on the same 'side' of Vec.