public void Example()
{
this.Name = "Elements_ModelArrows";
// <example>
// Create some arrow locations.
var vectors = new List <(Vector3 location, Vector3 direction, double magnitude, Color?color)>();
var target = new Vector3(15, 20);
var squareSize = 25.0;
var maxDistance = Math.Sqrt(Math.Pow(squareSize, 2) + Math.Pow(squareSize, 2));
for (var x = 0.0; x < squareSize; x += 1.0)
{
for (var y = 0.0; y < squareSize; y += 1.0)
{
var l = new Vector3(x, y);
var d = (target - l).Unitized();
var distance = target.DistanceTo(l);
var r = distance / maxDistance;
var c = new Color(x / squareSize, y / squareSize, 0.0, 1.0);
vectors.Add((l, d, r, c));
}
}
// Create a model arrows object.
var modelArrows = new ModelArrows(vectors, false, true);
// </example>
this.Model.AddElement(modelArrows);
}
public void TessellatorProducesCorrectVertexNormals()
{
Name = nameof(TessellatorProducesCorrectVertexNormals);
var shape = new Polygon((4.96243, 50.58403), (5.78472, 50.58403), (5.78472, 65.83403), (-7.05727, 65.83403), (-7.05727, 50.57403), (4.96243, 50.57403));
var geoElem = new GeometricElement(representation: new Extrude(shape, 1, Vector3.ZAxis, false));
Model.AddElement(geoElem);
var solid = geoElem.GetFinalCsgFromSolids();
var mgb = new MockGraphicsBuffer();
var arrows = new ModelArrows();
Tessellation.Tessellate(new Csg.Solid[] { solid }.Select(s => new CsgTessellationTargetProvider(solid)), mgb);
for (int i = 0; i < mgb.Indices.Count; i += 3)
{
var a = mgb.Indices[i];
var b = mgb.Indices[i + 1];
var c = mgb.Indices[i + 2];
var verts = new[] { mgb.Vertices[a], mgb.Vertices[b], mgb.Vertices[c] };
verts.ToList().ForEach((v) =>
{
arrows.Vectors.Add((v.position, v.normal, 0.2, Colors.Blue));
});
var triangle = new Polygon(verts.Select(v => v.position).ToList());
var normal = verts[0].normal;
Assert.True(triangle.Normal().Dot(normal.Unitized()) > 0, "The vertex normals are pointing in the opposite direction as their triangles' winding should suggest");
Model.AddElement(triangle.TransformedPolygon(new Transform(normal * 0.2)));
}
Model.AddElement(arrows);
}
