void DrawSpline(Spline3D spline, Viewport3D viewport)
{
var splineWorldMatrix = spline.GlobalTransform;
var viewportToSceneFrame = viewport.CalcTransitionToSpaceOf(SceneView.Instance.Frame);
for (var i = 0; i < spline.Nodes.Count - 1; i++)
{
var n1 = (SplinePoint3D)spline.Nodes[i];
var n2 = (SplinePoint3D)spline.Nodes[i + 1];
splineApproximation.Clear();
splineApproximation.Add(n1.Position);
Approximate(n1.Position, n1.Position + n1.TangentA, n2.Position + n2.TangentB, n2.Position, 0.01f, 0, splineApproximation);
splineApproximation.Add(n2.Position);
var start = Vector2.Zero;
for (var j = 0; j < splineApproximation.Count; j++)
{
var end = (Vector2)viewport.WorldToViewportPoint(splineApproximation[j] * spline.GlobalTransform) * viewportToSceneFrame;
if (j > 0)
{
SplinePresenter.DrawColoredLine(start, end, Color4.White, Color4.Black);
}
start = end;
}
}
}
bool HitTestControlPoint(Spline3D spline, Vector3 pointInSplineCoordinates)
{
var viewport = spline.Viewport;
var viewportToScene = viewport.CalcTransitionToSpaceOf(SceneView.Instance.Scene);
var screenPoint = (Vector2)viewport.WorldToViewportPoint(pointInSplineCoordinates * spline.GlobalTransform) * viewportToScene;
return(SceneView.Instance.HitTestControlPoint(screenPoint));
}
static Plane CalcPlane(Spline3D spline, Vector3 point)
{
var m = spline.GlobalTransform;
var normal = m.TransformNormal(new Vector3(0, 0, 1)).Normalized;
var d = -Vector3.DotProduct(m.TransformVector(point), normal);
return(new Plane(normal, d));
}
bool HitTestControlPoint(Spline3D spline, Vector3 pointInSplineCoordinates)
{
var viewport = spline.Viewport;
var sv = SceneView.Instance;
var viewportToScene = viewport.LocalToWorldTransform;
var screenPoint = (Vector2)viewport.WorldToViewportPoint(pointInSplineCoordinates * spline.GlobalTransform) * viewportToScene;
return(sv.HitTestControlPoint(screenPoint));
}
private Spline3D CalculateSpline3D(Func <double, double, double> fxy)
{
double dx = (XMax - XMin) / N, dy = (YMax - YMin) / N;
double x, y, z;
var spline3D = new Spline3D();
for (var ix = 0; ix <= N; ix++)
{
for (var iy = 0; iy <= N; iy++)
{
x = XMin + ix * dx;
y = YMin + iy * dy;
z = fxy(x, y);
if (!double.IsNaN(z) && !double.IsInfinity(z))
{
spline3D.addPoint(new Point3D(x, y, z));
}
}
}
return(spline3D);
}
private void AppendLine(Geometry geometry, Line line)
{
var spline = new Spline3D(line.points);
var forward = (spline[1] - spline[0]).normalized;
var left = Vector3.Cross(forward, Vector3.up);
var point = spline.GetValue(0);
geometry.vertices.Add(point + left * line.width / 2);
geometry.vertices.Add(point - left * line.width / 2);
geometry.normals.Add(Vector3.up);
geometry.normals.Add(Vector3.up);
geometry.uvs.Add(new Vector2(0, 0));
geometry.uvs.Add(new Vector2(1, 0));
geometry.colors.Add(line.color);
geometry.colors.Add(line.color);
var previousPoint = point;
for (int i = 1; i < line.segments * spline.Length; i++)
{
var t = i / (float)line.segments;
point = spline.GetValue(t);
forward = (point - previousPoint).normalized;
previousPoint = point;
left = Vector3.Cross(forward, Vector3.up);
var vertexCount = geometry.vertices.Count;
geometry.vertices.Add(point + left * line.width / 2);
geometry.vertices.Add(point - left * line.width / 2);
geometry.normals.Add(Vector3.up);
geometry.normals.Add(Vector3.up);
geometry.uvs.Add(new Vector2(0, t));
geometry.uvs.Add(new Vector2(1, t));
geometry.colors.Add(line.color);
geometry.colors.Add(line.color);
geometry.triangles.Add(vertexCount + 0);
geometry.triangles.Add(vertexCount + 1);
geometry.triangles.Add(vertexCount - 2);
geometry.triangles.Add(vertexCount + 1);
geometry.triangles.Add(vertexCount - 1);
geometry.triangles.Add(vertexCount - 2);
}
}