private static void ExportEdgeToSVG(System.IO.TextWriter writer, ISurface surface, Topology.FaceEdge edge, Topology.FaceEdge nearVertexFaceEdge, Topology.FaceEdge farVertexFaceEdge, Func <Vector3, Vector2> flatten, IVertexAttribute <Vector3> vertexPositions, string arrowFormat, string edgeIndexFormat, SVGStyle style, string additionalClasses)
{
var p0 = vertexPositions[nearVertexFaceEdge];
var p1 = vertexPositions[farVertexFaceEdge];
var n0 = surface.GetNormal(p0);
var n1 = surface.GetNormal(p1);
var edgeDirection = (p1 - p0).normalized;
var edgeNormal0 = (n0 + n1).normalized;
var edgeNormal1 = Vector3.Cross(edgeDirection, edgeNormal0);
var offset0 = edgeDirection * (style.vertexCircleRadius + style.edgeSeparation);
var offset1 = edgeNormal1 * style.edgeSeparation * 0.5f;
var offset2 = -edgeDirection * style.edgeArrowOffset.x + edgeNormal1 * style.edgeArrowOffset.y;
Vector2 arrow0 = flatten(p0 + offset0 + offset1);
Vector2 arrow1 = flatten(p1 - offset0 + offset1);
Vector2 arrow2 = flatten(p1 - offset0 + offset1 + offset2);
writer.WriteLine(arrowFormat, arrow0.x, arrow0.y, arrow1.x, arrow1.y, arrow2.x, arrow2.y, additionalClasses);
if (style.showEdgeIndices)
{
var edgeCenter = flatten((p0 + p1) * 0.5f + edgeNormal1 * (style.edgeSeparation * 0.5f + style.edgeIndexOffset));
writer.WriteLine(edgeIndexFormat, edgeCenter.x, edgeCenter.y, edge.index, additionalClasses);
}
}
/// <summary>
/// Calculates vertex normals using the surface normal reported by the given surface based on the position of each vertex.
/// </summary>
/// <param name="vertices">The collection of vertices whose normals are to be calculated.</param>
/// <param name="surface">The surface descriptor that will provide surface normal information.</param>
/// <param name="vertexPositions">The positions of the vertices.</param>
/// <param name="vertexNormals">A pre-allocated collection in which the vertex normals will be stored.</param>
/// <returns>The surface normals of the vertices.</returns>
public static IVertexAttribute <Vector3> CalculateVertexNormalsFromSurface(Topology.VerticesIndexer vertices, ISurface surface, IVertexAttribute <Vector3> vertexPositions, IVertexAttribute <Vector3> vertexNormals)
{
foreach (var vertex in vertices)
{
vertexNormals[vertex] = surface.GetNormal(vertexPositions[vertex]);
}
return(vertexNormals);
}
public Intersection(double distance, ISurface surface, Ray ray)
{
Distance = distance;
Surface = surface;
Ray = ray;
Position = ray.GetPosition(distance);
EyeVector = -ray.Direction;
var candidateNormalVector = surface.GetNormal(Position);
IsInsideSurface = candidateNormalVector * EyeVector < 0;
NormalVector = IsInsideSurface
? -candidateNormalVector
: candidateNormalVector;
OverPosition = Position + (NormalVector * Constants.Epsilon);
}
public GeoVector GetNormal(GeoPoint2D uv)
{
return(original.GetNormal(unscale * uv));
}
/// <summary>
/// Overrides <see cref="CADability.GeoObject.ISurfaceImpl.PointAt (GeoPoint2D)"/>
/// </summary>
/// <param name="uv"></param>
/// <returns></returns>
public override GeoPoint PointAt(GeoPoint2D uv)
{
return(baseSurface.PointAt(uv) + offset * baseSurface.GetNormal(uv).Normalized);
}
