MSDN.WhiteKnight - Stack Overflow answers
Ответ на "Перемещение точек в 3D пространстве"
Answer 1001409
у самой камеры в свойствах есть только LookDirection и UpDirection
Это по сути все, что нужно для решения задачи. Искомый вектор ортогонален обоим этим векторам, а значит является их векторным произведением - результат нужно лишь умножить на значение, зависящее от направления и величины желаемого перемещения (отрицательное для перемещения влево). Вот демонстрация перемещения влево и вправо по нажатию клавиш-стрелок:
XAML:
<Window x:Class="Wpf3d.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" WindowState="Maximized" KeyDown="Window_KeyDown" > <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" > <Viewport3D Name="myViewport" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <!-- Add a camera. --> <Viewport3D.Camera> <PerspectiveCamera FarPlaneDistance="20" LookDirection="0,0,1" UpDirection="0,1,0" NearPlaneDistance="1" Position="0,0,-6" FieldOfView="45" /> </Viewport3D.Camera> <!-- Add models. --> <Viewport3D.Children> <ModelVisual3D> <ModelVisual3D.Content> <Model3DGroup > <Model3DGroup.Children> <!-- Lights, MeshGeometry3D and DiffuseMaterial objects are added to the ModelVisual3D. --> <DirectionalLight Color="#FFFFFFFF" Direction="3,-4,5" /> <!-- Define a red cone. --> <GeometryModel3D> <GeometryModel3D.Geometry> <MeshGeometry3D Positions="0.293893 -0.5 0.404509 0.475528 -0.5 0.154509 0 0.5 0 0.475528 -0.5 0.154509 0 0.5 0 0 0.5 0 0.475528 -0.5 0.154509 0.475528 -0.5 -0.154509 0 0.5 0 0.475528 -0.5 -0.154509 0 0.5 0 0 0.5 0 0.475528 -0.5 -0.154509 0.293893 -0.5 -0.404509 0 0.5 0 0.293893 -0.5 -0.404509 0 0.5 0 0 0.5 0 0.293893 -0.5 -0.404509 0 -0.5 -0.5 0 0.5 0 0 -0.5 -0.5 0 0.5 0 0 0.5 0 0 -0.5 -0.5 -0.293893 -0.5 -0.404509 0 0.5 0 -0.293893 -0.5 -0.404509 0 0.5 0 0 0.5 0 -0.293893 -0.5 -0.404509 -0.475528 -0.5 -0.154509 0 0.5 0 -0.475528 -0.5 -0.154509 0 0.5 0 0 0.5 0 -0.475528 -0.5 -0.154509 -0.475528 -0.5 0.154509 0 0.5 0 -0.475528 -0.5 0.154509 0 0.5 0 0 0.5 0 -0.475528 -0.5 0.154509 -0.293892 -0.5 0.404509 0 0.5 0 -0.293892 -0.5 0.404509 0 0.5 0 0 0.5 0 -0.293892 -0.5 0.404509 0 -0.5 0.5 0 0.5 0 0 -0.5 0.5 0 0.5 0 0 0.5 0 0 -0.5 0.5 0.293893 -0.5 0.404509 0 0.5 0 0.293893 -0.5 0.404509 0 0.5 0 0 0.5 0 " Normals="0.7236065,0.4472139,0.5257313 0.2763934,0.4472138,0.8506507 0.5308242,0.4294462,0.7306172 0.2763934,0.4472138,0.8506507 0,0.4294458,0.9030925 0.5308242,0.4294462,0.7306172 0.2763934,0.4472138,0.8506507 -0.2763934,0.4472138,0.8506507 0,0.4294458,0.9030925 -0.2763934,0.4472138,0.8506507 -0.5308242,0.4294462,0.7306172 0,0.4294458,0.9030925 -0.2763934,0.4472138,0.8506507 -0.7236065,0.4472139,0.5257313 -0.5308242,0.4294462,0.7306172 -0.7236065,0.4472139,0.5257313 -0.858892,0.429446,0.279071 -0.5308242,0.4294462,0.7306172 -0.7236065,0.4472139,0.5257313 -0.8944269,0.4472139,0 -0.858892,0.429446,0.279071 -0.8944269,0.4472139,0 -0.858892,0.429446,-0.279071 -0.858892,0.429446,0.279071 -0.8944269,0.4472139,0 -0.7236065,0.4472139,-0.5257313 -0.858892,0.429446,-0.279071 -0.7236065,0.4472139,-0.5257313 -0.5308242,0.4294462,-0.7306172 -0.858892,0.429446,-0.279071 -0.7236065,0.4472139,-0.5257313 -0.2763934,0.4472138,-0.8506507 -0.5308242,0.4294462,-0.7306172 -0.2763934,0.4472138,-0.8506507 0,0.4294458,-0.9030925 -0.5308242,0.4294462,-0.7306172 -0.2763934,0.4472138,-0.8506507 0.2763934,0.4472138,-0.8506507 0,0.4294458,-0.9030925 0.2763934,0.4472138,-0.8506507 0.5308249,0.4294459,-0.7306169 0,0.4294458,-0.9030925 0.2763934,0.4472138,-0.8506507 0.7236068,0.4472141,-0.5257306 0.5308249,0.4294459,-0.7306169 0.7236068,0.4472141,-0.5257306 0.8588922,0.4294461,-0.27907 0.5308249,0.4294459,-0.7306169 0.7236068,0.4472141,-0.5257306 0.8944269,0.4472139,0 0.8588922,0.4294461,-0.27907 0.8944269,0.4472139,0 0.858892,0.429446,0.279071 0.8588922,0.4294461,-0.27907 0.8944269,0.4472139,0 0.7236065,0.4472139,0.5257313 0.858892,0.429446,0.279071 0.7236065,0.4472139,0.5257313 0.5308242,0.4294462,0.7306172 0.858892,0.429446,0.279071 " TriangleIndices="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 " /> </GeometryModel3D.Geometry> <GeometryModel3D.Material> <DiffuseMaterial> <DiffuseMaterial.Brush> <SolidColorBrush Color="Red" Opacity="1.0"/> </DiffuseMaterial.Brush> </DiffuseMaterial> </GeometryModel3D.Material> </GeometryModel3D> </Model3DGroup.Children> </Model3DGroup> </ModelVisual3D.Content> </ModelVisual3D> </Viewport3D.Children> </Viewport3D> </Grid> </Window>
C#:
using System; using System.Collections.Generic; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Input; using System.Windows.Media.Media3D; namespace Wpf3d { public partial class MainWindow : Window { PerspectiveCamera cam; public MainWindow() { InitializeComponent(); cam = myViewport.Camera as PerspectiveCamera; } private void Window_KeyDown(object sender, KeyEventArgs e) { double factor = 0.0; if (e.Key == Key.Left) factor = -1.0; else if (e.Key == Key.Right) factor = 1.0; else return; Point3D p0 = cam.Position; Vector3D L = cam.LookDirection; Vector3D U = cam.UpDirection; Vector3D normal = Vector3D.CrossProduct(L, U); normal.Normalize(); normal = Vector3D.Multiply(factor, normal); Point3D p = p0 + normal; cam.Position = p; } } }
Content is retrieved from StackExchange API.
Auto-generated by ruso-archive tools.