blocks|key|567364|text|使用helixtoolkit中的PointsVisual3D类，你可以在viewport上添加带有颜色，大小的点。甚至你也可以应用变换。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|567365|entityMap^0|2|C|G|E|10|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

Use <code>PointsVisual3D</code> class from <code>helixtoolkit</code>, with it you can add points on <code>viewport</code> with color, size. Even you can apply transforms, too.

blocks|key|2479215|text|看不见一个点，因为它没有表面积。不幸的是，WPF+3d不是光线跟踪引擎。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2479216|然而，有人构建了一个非常好的光线跟踪起始库。如果你想用WPF：http://raytracer.codeplex.com/进行光线跟踪，这个项目是一个很好的起点。|offset|length|2479217|entityMap|0|LINK|mutability|MUTABLE|url|http://raytracer.codeplex.com/^0|0|V|U|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

A point can't be seen, because it has no surface area. WPF 3d is not a ray tracing engine, unfortunately.

However, someone built a pretty nice ray-tracing starter library. This project is a good starting point if you want to do ray-tracing with WPF: <a href="http://raytracer.codeplex.com/" rel="nofollow">http://raytracer.codeplex.com/</a>.

blocks|key|5841727|text|这并不是一项复杂的任务。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5841728|5841729|下载Helix3D库|ordered-list-item|5841730|在samples|5841731|中找到球面网格代码将scphere的半径附加到缩放实现。|5841732|5841733|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|P|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

It is not so complicated task.

<ol>
<li>Download the Helix3D Library</li>
<li>Find the sphere mesh code in samples</li>
<li>Attach the scphere's radius to zooming realization.</li>
</ol>

blocks|key|5841814|text|我可以创建一个PointVisual3d自己的类。下面是PointVisual3D的代码，我认为这对你很有帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5841815|public+class+PointVisual3D:ModelVisual3D
{
++++private+readonly+GeometryModel3D+_model;
++++private+readonly+MeshGeometry3D+_mesh;
++++private+Matrix3D+_visualToScreen;
++++private+Matrix3D+_screenToVisual;
++++public+PointVisual3D()
++++{
++++++++_mesh+=+new+MeshGeometry3D();
++++++++_model+=+new+GeometryModel3D();
++++++++_model.Geometry+=+_mesh;
++++++++SetColor(this.Color);
++++++++this.Content+=+_model;
++++++++this.Points+=+new+Point3DCollection();
++++++++CompositionTarget.Rendering+%2B=+OnRender;
++++}

++++private+void+OnRender(object+sender,+EventArgs+e)
++++{
++++++++if+(Points.Count+==+0+&&+_mesh.Positions.Count+==+0)
++++++++{
++++++++++++return;
++++++++}
++++++++if+(UpdateTransforms()+&&+MainWindow.mousedown==false)
++++++++{
++++++++++++RebuildGeometry();
++++++++}
++++}

++++public+static+readonly+DependencyProperty+ColorProperty+=+DependencyProperty.Register("Color",+typeof(Color),+typeof(PointVisual3D),+new+PropertyMetadata(Colors.White,+OnColorChanged));
++++private+static+void+OnColorChanged(DependencyObject+sender,+DependencyPropertyChangedEventArgs+args)
++++{
++++++++((PointVisual3D)sender).SetColor((Color)args.NewValue);
++++}

++++private+void+SetColor(Color+color)
++++{
++++++++MaterialGroup+unlitMaterial+=+new+MaterialGroup();
++++++++unlitMaterial.Children.Add(new+DiffuseMaterial(new+SolidColorBrush(Colors.Black)));
++++++++unlitMaterial.Children.Add(new+EmissiveMaterial(new+SolidColorBrush(color)));
++++++++unlitMaterial.Freeze();
++++++++_model.Material+=+unlitMaterial;
++++++++_model.BackMaterial+=+unlitMaterial;
++++}

++++public+Color+Color
++++{
++++++++get+{+return+(Color)GetValue(ColorProperty);+}
++++++++set+{+SetValue(ColorProperty,+value);+}
++++}

++++//public+static+readonly+DependencyProperty+ThicknessProperty+=+DependencyProperty.Register("Thickness",+typeof(double),+typeof(PointVisual3D),+new+PropertyMetadata(1.0,+OnThicknessChanged));
++++//private+static+void+OnThicknessChanged(DependencyObject+sender,+DependencyPropertyChangedEventArgs+args)
++++//{
++++//++++((PointVisual3D)sender).GeometryDirty();
++++//}

++++//public+double+Thickness
++++//{
++++//++++get+{+return+(double)GetValue(ThicknessProperty);+}
++++//++++set+{+SetValue(ThicknessProperty,+value);+}
++++//}

++++public+static+readonly+DependencyProperty+PointsProperty+=+DependencyProperty.Register("Points",+typeof(Point3DCollection),+typeof(PointVisual3D),+new+PropertyMetadata(null,+OnPointsChanged));
++++private+static+void+OnPointsChanged(DependencyObject+sender,+DependencyPropertyChangedEventArgs+args)
++++{
++++++++((PointVisual3D)sender).GeometryDirty();
++++}

++++public+Point3DCollection+Points
++++{
++++++++get+{+return+(Point3DCollection)GetValue(PointsProperty);+}
++++++++set+{+SetValue(PointsProperty,+value);+}
++++}

++++private+void+GeometryDirty()
++++{
++++++++_visualToScreen+=+MathUtils.ZeroMatrix;
++++}

++++private+void+RebuildGeometry()
++++{
++++++++//double+halfThickness+=+Thickness+/+2.0;
++++++++//int+numLines+=+Points.Count+/+2;
++++++++//Point3DCollection+positions+=+new+Point3DCollection(numLines+*+4);
++++++++//for+(int+i+=+0;+i+<+numLines;+i%2B%2B)
++++++++//{
++++++++//++++int+startIndex+=+i+*+2;
++++++++//++++Point3D+startPoint+=+Points[startIndex];
++++++++//++++Point3D+endPoint+=+Points[startIndex+%2B+1];
++++++++//++++AddSegment(positions,+startPoint,+endPoint,+halfThickness);
++++++++//}
++++++++//positions.Freeze();
++++++++//_mesh.Positions+=+positions;
++++++++Int32Collection+indices+=+new+Int32Collection(Points.Count+*+6);
++++++++for+(int+i+=+0;+i+<+Points.Count;+i%2B%2B)
++++++++{
++++++++++++indices.Add(i+*+4+%2B+2);
++++++++++++indices.Add(i+*+4+%2B+1);
++++++++++++indices.Add(i+*+4+%2B+0);
++++++++++++indices.Add(i+*+4+%2B+2);
++++++++++++indices.Add(i+*+4+%2B+3);
++++++++++++indices.Add(i+*+4+%2B+1);
++++++++}

++++++++indices.Freeze();
++++++++_mesh.TriangleIndices+=+indices;
++++++++_mesh.Positions+=+CreatePositions(this.Points,+this.Size,+0.0);
++++}

++++public+Point3DCollection+CreatePositions(IList<Point3D>+points,+double+size+=+1.0,+double+depthOffset+=+0.0)
++++{
++++++++double+halfSize+=+size+/+2.0;
++++++++int+numPoints+=+points.Count;

++++++++var+outline+=+new[]
++++++++++++{
++++++++++++++++new+Vector(-halfSize,+halfSize),+new+Vector(-halfSize,+-halfSize),+new+Vector(halfSize,+halfSize),
++++++++++++++++new+Vector(halfSize,+-halfSize)
++++++++++++};

++++++++var+positions+=+new+Point3DCollection(numPoints+*+4);

++++++++for+(int+i+=+0;+i+<+numPoints;+i%2B%2B)
++++++++{
++++++++++++var+screenPoint+=+(Point4D)points[i]+*+this._visualToScreen;

++++++++++++double+spx+=+screenPoint.X;
++++++++++++double+spy+=+screenPoint.Y;
++++++++++++double+spz+=+screenPoint.Z;
++++++++++++double+spw+=+screenPoint.W;

++++++++++++if+(!depthOffset.Equals(0))
++++++++++++{
++++++++++++++++spz+-=+depthOffset+*+spw;
++++++++++++}

++++++++++++var+p0+=+new+Point4D(spx,+spy,+spz,+spw)+*+this._screenToVisual;
++++++++++++double+pwinverse+=+1+/+p0.W;

++++++++++++foreach+(var+v+in+outline)
++++++++++++{
++++++++++++++++var+p+=+new+Point4D(spx+%2B+v.X+*+spw,+spy+%2B+v.Y+*+spw,+spz,+spw)+*+this._screenToVisual;
++++++++++++++++positions.Add(new+Point3D(p.X+*+pwinverse,+p.Y+*+pwinverse,+p.Z+*+pwinverse));
++++++++++++}
++++++++}

++++++++positions.Freeze();
++++++++return+positions;
++++}

++++///+<summary>
++++///+Identifies+the+<see+cref="Size"/>+dependency+property.
++++///+</summary>
++++public+static+readonly+DependencyProperty+SizeProperty+=+DependencyProperty.Register(
++++++++"Size",+typeof(double),+typeof(PointVisual3D),+new+UIPropertyMetadata(1.0,+GeometryChanged));

++++protected+static+void+GeometryChanged(object+sender,+DependencyPropertyChangedEventArgs+e)
++++{
++++++++((PointVisual3D)sender).GeometryDirty();
++++}

++++public+double+Size
++++{
++++++++get
++++++++{
++++++++++++return+(double)this.GetValue(SizeProperty);
++++++++}

++++++++set
++++++++{
++++++++++++this.SetValue(SizeProperty,+value);
++++++++}
++++}


++++//private+void+AddSegment(Point3DCollection+positions,+Point3D+startPoint,+Point3D+endPoint,+double+halfThickness)
++++//{
++++//++++Vector3D+lineDirection+=+endPoint+*+_visualToScreen+-+startPoint+*+_visualToScreen;
++++//++++lineDirection.Z+=+0;
++++//++++lineDirection.Normalize();
++++//++++Vector+delta+=+new+Vector(-lineDirection.Y,+lineDirection.X);
++++//++++delta+*=+halfThickness;
++++//++++Point3D+pOut1,+pOut2;
++++//++++Widen(startPoint,+delta,+out+pOut1,+out+pOut2);
++++//++++positions.Add(pOut1);
++++//++++positions.Add(pOut2);
++++//++++Widen(endPoint,+delta,+out+pOut1,+out+pOut2);
++++//++++positions.Add(pOut1);
++++//++++positions.Add(pOut2);
++++//}
++++//private+void+Widen(Point3D+pIn,+Vector+delta,+out+Point3D+pOut1,+out+Point3D+pOut2)
++++//{
++++//++++Point4D+pIn4+=+(Point4D)pIn;
++++//++++Point4D+pOut41+=+pIn4+*+_visualToScreen;
++++//++++Point4D+pOut42+=+pOut41;
++++//++++pOut41.X+%2B=+delta.X+*+pOut41.W;
++++//++++pOut41.Y+%2B=+delta.Y+*+pOut41.W;
++++//++++pOut42.X+-=+delta.X+*+pOut42.W;
++++//++++pOut42.Y+-=+delta.Y+*+pOut42.W;
++++//++++pOut41+*=+_screenToVisual;
++++//++++pOut42+*=+_screenToVisual;
++++//++++pOut1+=+new+Point3D(pOut41.X+/+pOut41.W,+pOut41.Y+/+pOut41.W,+pOut41.Z+/+pOut41.W);
++++//++++pOut2+=+new+Point3D(pOut42.X+/+pOut42.W,+pOut42.Y+/+pOut42.W,+pOut42.Z+/+pOut42.W);
++++//}
++++private+bool+UpdateTransforms()
++++{
++++++++Viewport3DVisual+viewport;
++++++++bool+success;
++++++++Matrix3D+visualToScreen+=+MathUtils.TryTransformTo2DAncestor(this,+out+viewport,+out+success);
++++++++if+(!success+%7C%7C+!visualToScreen.HasInverse)
++++++++{
++++++++++++_mesh.Positions+=+null;
++++++++++++return+false;
++++++++}
++++++++if+(visualToScreen+==+_visualToScreen)
++++++++{
++++++++++++return+false;
++++++++}
++++++++_visualToScreen+=+_screenToVisual+=+visualToScreen;
++++++++_screenToVisual.Invert();
++++++++return+true;
++++}
}|code-block|syntax|javascript|5841816|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

i can create a PointVisual3d Own Class. The code of PointVisual3D is below i think this one is helpful for you...

<pre><code>public class PointVisual3D:ModelVisual3D
{
 private readonly GeometryModel3D _model;
 private readonly MeshGeometry3D _mesh;
 private Matrix3D _visualToScreen;
 private Matrix3D _screenToVisual;
 public PointVisual3D()
 {
 _mesh = new MeshGeometry3D();
 _model = new GeometryModel3D();
 _model.Geometry = _mesh;
 SetColor(this.Color);
 this.Content = _model;
 this.Points = new Point3DCollection();
 CompositionTarget.Rendering += OnRender;
 }

 private void OnRender(object sender, EventArgs e)
 {
 if (Points.Count == 0 &amp;&amp; _mesh.Positions.Count == 0)
 {
 return;
 }
 if (UpdateTransforms() &amp;&amp; MainWindow.mousedown==false)
 {
 RebuildGeometry();
 }
 }

 public static readonly DependencyProperty ColorProperty = DependencyProperty.Register("Color", typeof(Color), typeof(PointVisual3D), new PropertyMetadata(Colors.White, OnColorChanged));
 private static void OnColorChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
 {
 ((PointVisual3D)sender).SetColor((Color)args.NewValue);
 }

 private void SetColor(Color color)
 {
 MaterialGroup unlitMaterial = new MaterialGroup();
 unlitMaterial.Children.Add(new DiffuseMaterial(new SolidColorBrush(Colors.Black)));
 unlitMaterial.Children.Add(new EmissiveMaterial(new SolidColorBrush(color)));
 unlitMaterial.Freeze();
 _model.Material = unlitMaterial;
 _model.BackMaterial = unlitMaterial;
 }

 public Color Color
 {
 get { return (Color)GetValue(ColorProperty); }
 set { SetValue(ColorProperty, value); }
 }

 //public static readonly DependencyProperty ThicknessProperty = DependencyProperty.Register("Thickness", typeof(double), typeof(PointVisual3D), new PropertyMetadata(1.0, OnThicknessChanged));
 //private static void OnThicknessChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
 //{
 // ((PointVisual3D)sender).GeometryDirty();
 //}

 //public double Thickness
 //{
 // get { return (double)GetValue(ThicknessProperty); }
 // set { SetValue(ThicknessProperty, value); }
 //}

 public static readonly DependencyProperty PointsProperty = DependencyProperty.Register("Points", typeof(Point3DCollection), typeof(PointVisual3D), new PropertyMetadata(null, OnPointsChanged));
 private static void OnPointsChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
 {
 ((PointVisual3D)sender).GeometryDirty();
 }

 public Point3DCollection Points
 {
 get { return (Point3DCollection)GetValue(PointsProperty); }
 set { SetValue(PointsProperty, value); }
 }

 private void GeometryDirty()
 {
 _visualToScreen = MathUtils.ZeroMatrix;
 }

 private void RebuildGeometry()
 {
 //double halfThickness = Thickness / 2.0;
 //int numLines = Points.Count / 2;
 //Point3DCollection positions = new Point3DCollection(numLines * 4);
 //for (int i = 0; i &lt; numLines; i++)
 //{
 // int startIndex = i * 2;
 // Point3D startPoint = Points[startIndex];
 // Point3D endPoint = Points[startIndex + 1];
 // AddSegment(positions, startPoint, endPoint, halfThickness);
 //}
 //positions.Freeze();
 //_mesh.Positions = positions;
 Int32Collection indices = new Int32Collection(Points.Count * 6);
 for (int i = 0; i &lt; Points.Count; i++)
 {
 indices.Add(i * 4 + 2);
 indices.Add(i * 4 + 1);
 indices.Add(i * 4 + 0);
 indices.Add(i * 4 + 2);
 indices.Add(i * 4 + 3);
 indices.Add(i * 4 + 1);
 }

 indices.Freeze();
 _mesh.TriangleIndices = indices;
 _mesh.Positions = CreatePositions(this.Points, this.Size, 0.0);
 }

 public Point3DCollection CreatePositions(IList&lt;Point3D&gt; points, double size = 1.0, double depthOffset = 0.0)
 {
 double halfSize = size / 2.0;
 int numPoints = points.Count;

 var outline = new[]
 {
 new Vector(-halfSize, halfSize), new Vector(-halfSize, -halfSize), new Vector(halfSize, halfSize),
 new Vector(halfSize, -halfSize)
 };

 var positions = new Point3DCollection(numPoints * 4);

 for (int i = 0; i &lt; numPoints; i++)
 {
 var screenPoint = (Point4D)points[i] * this._visualToScreen;

 double spx = screenPoint.X;
 double spy = screenPoint.Y;
 double spz = screenPoint.Z;
 double spw = screenPoint.W;

 if (!depthOffset.Equals(0))
 {
 spz -= depthOffset * spw;
 }

 var p0 = new Point4D(spx, spy, spz, spw) * this._screenToVisual;
 double pwinverse = 1 / p0.W;

 foreach (var v in outline)
 {
 var p = new Point4D(spx + v.X * spw, spy + v.Y * spw, spz, spw) * this._screenToVisual;
 positions.Add(new Point3D(p.X * pwinverse, p.Y * pwinverse, p.Z * pwinverse));
 }
 }

 positions.Freeze();
 return positions;
 }

 /// &lt;summary&gt;
 /// Identifies the &lt;see cref="Size"/&gt; dependency property.
 /// &lt;/summary&gt;
 public static readonly DependencyProperty SizeProperty = DependencyProperty.Register(
 "Size", typeof(double), typeof(PointVisual3D), new UIPropertyMetadata(1.0, GeometryChanged));

 protected static void GeometryChanged(object sender, DependencyPropertyChangedEventArgs e)
 {
 ((PointVisual3D)sender).GeometryDirty();
 }

 public double Size
 {
 get
 {
 return (double)this.GetValue(SizeProperty);
 }

 set
 {
 this.SetValue(SizeProperty, value);
 }
 }


 //private void AddSegment(Point3DCollection positions, Point3D startPoint, Point3D endPoint, double halfThickness)
 //{
 // Vector3D lineDirection = endPoint * _visualToScreen - startPoint * _visualToScreen;
 // lineDirection.Z = 0;
 // lineDirection.Normalize();
 // Vector delta = new Vector(-lineDirection.Y, lineDirection.X);
 // delta *= halfThickness;
 // Point3D pOut1, pOut2;
 // Widen(startPoint, delta, out pOut1, out pOut2);
 // positions.Add(pOut1);
 // positions.Add(pOut2);
 // Widen(endPoint, delta, out pOut1, out pOut2);
 // positions.Add(pOut1);
 // positions.Add(pOut2);
 //}
 //private void Widen(Point3D pIn, Vector delta, out Point3D pOut1, out Point3D pOut2)
 //{
 // Point4D pIn4 = (Point4D)pIn;
 // Point4D pOut41 = pIn4 * _visualToScreen;
 // Point4D pOut42 = pOut41;
 // pOut41.X += delta.X * pOut41.W;
 // pOut41.Y += delta.Y * pOut41.W;
 // pOut42.X -= delta.X * pOut42.W;
 // pOut42.Y -= delta.Y * pOut42.W;
 // pOut41 *= _screenToVisual;
 // pOut42 *= _screenToVisual;
 // pOut1 = new Point3D(pOut41.X / pOut41.W, pOut41.Y / pOut41.W, pOut41.Z / pOut41.W);
 // pOut2 = new Point3D(pOut42.X / pOut42.W, pOut42.Y / pOut42.W, pOut42.Z / pOut42.W);
 //}
 private bool UpdateTransforms()
 {
 Viewport3DVisual viewport;
 bool success;
 Matrix3D visualToScreen = MathUtils.TryTransformTo2DAncestor(this, out viewport, out success);
 if (!success || !visualToScreen.HasInverse)
 {
 _mesh.Positions = null;
 return false;
 }
 if (visualToScreen == _visualToScreen)
 {
 return false;
 }
 _visualToScreen = _screenToVisual = visualToScreen;
 _screenToVisual.Invert();
 return true;
 }
}
</code></pre>

I need to draw a point in 3D using WPF. I am using class ScreenSpaceLines3D to draw a line in 3D, but I'm not able to draw point in 3D (while model zooming). Can anybody help me? Some example code would be appreciated. Thanks

WPF 3D POINT DRAWING

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我需要使用WPF在3D中绘制一个点。我正在使用ScreenSpaceLines3D类在3D中绘制一条直线，但我无法在3D中绘制点(当模型缩放时)。有人能帮我吗？一些示例代码将不胜感激。谢谢

问WPF 3D点图形
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回答 4

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问WPF 3D点图形
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