/// <summary>
/// Populates a list with transformed face vertices.
/// </summary>
public static unsafe void ComputeFaceClippingPolygon(ref NativeBuffer <ClipVertex> output, int faceIndex, RigidTransform t, NativeHull hull)
{
Debug.Assert(output.IsCreated);
NativeFace * face = hull.GetFacePtr(faceIndex);
NativePlane plane = hull.GetPlane(faceIndex);
NativeHalfEdge *start = hull.GetEdgePtr(face->Edge);
NativeHalfEdge *current = start;
do
{
NativeHalfEdge *twin = hull.GetEdgePtr(current->Twin);
float3 vertex = hull.GetVertex(current->Origin);
float3 P = math.transform(t, vertex);
ClipVertex clipVertex;
clipVertex.featurePair.InEdge1 = -1;
clipVertex.featurePair.OutEdge1 = -1;
clipVertex.featurePair.InEdge2 = (sbyte)current->Next;
clipVertex.featurePair.OutEdge2 = (sbyte)twin->Twin;
clipVertex.position = P;
clipVertex.hull2local = vertex;
clipVertex.plane = plane;
output.Add(clipVertex);
current = hull.GetEdgePtr(current->Next);
} while (current != start);
}
public static unsafe void GetFaceSidePlanes(ref NativeBuffer <ClipPlane> output, NativePlane facePlane, int faceIndex, RigidTransform transform, NativeHull hull)
{
NativeHalfEdge *start = hull.GetEdgePtr(hull.GetFacePtr(faceIndex)->Edge);
NativeHalfEdge *current = start;
do
{
NativeHalfEdge *twin = hull.GetEdgePtr(current->Twin);
float3 P = math.transform(transform, hull.GetVertex(current->Origin));
float3 Q = math.transform(transform, hull.GetVertex(twin->Origin));
ClipPlane clipPlane = default;
clipPlane.edgeId = twin->Twin; //edge ID.
clipPlane.plane.Normal = math.normalize(math.cross(Q - P, facePlane.Normal));
clipPlane.plane.Offset = math.dot(clipPlane.plane.Normal, P);
output.Add(clipPlane);
current = hull.GetEdgePtr(current->Next);
}while (current != start);
}
