/// <summary>
/// Finds point on edge given mouse ray.
/// </summary>
private Vector3 FindClosestPointOnEdge(MeshUtils.Edge edge)
{
var ray = HandleUtility.GUIPointToWorldRay(Event.current.mousePosition);
return(ShapeUtils.ShortestDistanceSegmentSegment(ray.origin,
ray.GetPoint(500f),
edge.Start,
edge.End).PointOnSegment2);
}
/// <summary>
/// Finds closest triangle edge given ray and valid raycast result. The
/// Result.ClosestEdge field will be updated.
/// </summary>
/// <param name="ray">Ray in world coordinate system.</param>
/// <param name="result">Reference to valid result.</param>
private static void FindClosestEdge(Ray ray, ref Result result)
{
var rayStart = ray.origin;
var rayEnd = ray.GetPoint(5000.0f);
var d1 = ShapeUtils.ShortestDistanceSegmentSegment(rayStart,
rayEnd,
result.Triangle.Vertex1,
result.Triangle.Vertex2);
var d2 = ShapeUtils.ShortestDistanceSegmentSegment(rayStart,
rayEnd,
result.Triangle.Vertex2,
result.Triangle.Vertex3);
var d3 = ShapeUtils.ShortestDistanceSegmentSegment(rayStart,
rayEnd,
result.Triangle.Vertex3,
result.Triangle.Vertex1);
result.ClosestEdge = d1.Distance < d2.Distance && d1.Distance < d3.Distance ? new Edge()
{
Start = result.Triangle.Vertex1,
End = result.Triangle.Vertex2,
Normal = result.Triangle.Normal,
Type = Edge.EdgeType.Triangle
} :
d2.Distance < d1.Distance && d2.Distance < d3.Distance ? new Edge()
{
Start = result.Triangle.Vertex2,
End = result.Triangle.Vertex3,
Normal = result.Triangle.Normal,
Type = Edge.EdgeType.Triangle
} :
new Edge()
{
Start = result.Triangle.Vertex3,
End = result.Triangle.Vertex1,
Normal = result.Triangle.Normal,
Type = Edge.EdgeType.Triangle
};
}