WPF 3D 加載局部模型

本文轉載自查看原文 2012-09-27 20:59 3058 WPF 3D

這篇主要介紹如何實現局部加載模型。閱讀這篇博客前，需要參考我的另一篇博文，動態加載模型：http://www.cnblogs.com/enjoyeclipse/archive/2012/03/21/2410439.html

1.效果：

如圖所示，因為整個沙盤場景太大，因此需要將橋墩加載並進行放大。不知道大家玩過實況足球沒有，選擇某個球員就有這種效果。

2.思路：

1). 首先需要構造一個容器，這個容器有ViewPort元素；

2). 從大沙盤中選取需要的局部模型，並克隆一份(因為WPF中模型對象的Tree關系，因此不能直接將Add(model),必須Add(model.Clone()),

3). 將局部模型添加到容器的ViewPort中。

3.實現：

1). 首先需要構造一個容器，這個容器有ViewPort元素。

創建容器(UserControl):PartModelControl,最重要的里面要包含ViewPort,並提前把光照，攝像機什么的設置好

xaml代碼如下：

<UserControl x:Class="UI.Common.UserControls.PartModelControl"

xmlns= " http://schemas.microsoft.com/winfx/2006/xaml/presentation "
    xmlns:x= " http://schemas.microsoft.com/winfx/2006/xaml " xmlns:converter= " clr-namespace:UI.Common.Converters "
    Background= " Transparent "
    SnapsToDevicePixels= " True "
    x:Name= " modelPartControl " PreviewMouseDoubleClick= " modelPartControl_MouseDoubleClick ">
        ....
        <Viewport3D x:Name= " _partViewPort ">
            <Viewport3D.Camera>
                
                <PerspectiveCamera x:Name= " camera " FieldOfView= " 30 " FarPlaneDistance= " 102122.68952517369 " LookDirection= " 292.292480468755,-0.00048828125,-2204.4668208912 " Position= " -292.292480468755,0.00048828125,2204.4668208912 " NearPlaneDistance= " 0.1 "  UpDirection= " 0,1,0 "/>
            </Viewport3D.Camera>
            <ModelVisual3D x:Name= " World ">
                <ModelVisual3D x:Name= " AmbientLightContainer ">
                    <ModelVisual3D.Content>
                        <AmbientLight x:Name= " AmbientLight " Color= " #FF7F7F7F "/>
                    </ModelVisual3D.Content>
                </ModelVisual3D>
                <ModelVisual3D x:Name= " DirectionalLightContainer ">
                    <ModelVisual3D.Content>
                        <DirectionalLight x:Name= " DirectionalLight " Color= " #FF3F3F3F " Direction= " 0,0,-1 ">
                            <DirectionalLight.Transform>
                                <TranslateTransform3D OffsetX= " 0 " OffsetY= " 0 " OffsetZ= " 3 "/>
                            </DirectionalLight.Transform>
                        </DirectionalLight>
                    </ModelVisual3D.Content>
                </ModelVisual3D>
                <ModelVisual3D.Transform>
                    <TranslateTransform3D x:Name= " transform " OffsetX= " 0 " OffsetY= " 0 " OffsetZ= " 0 " />
                </ModelVisual3D.Transform>
            </ModelVisual3D>
        </Viewport3D>
        
        ....

</UserControl>

2). 從大沙盤中選取需要的局部模型，並克隆一份

從沙盤中選取模型：首先不能用WPF默認的方法制作3D,必須用第三方庫WaveFrontObjLoader動態加載模型，因為這時候他會將3D的名字和模型形成Dictionary,就可以用Find(string Name)方法加載模型了。具體參考我的博客：http://www.cnblogs.com/enjoyeclipse/archive/2012/03/21/2410439.html
實現ModelVisual3DWithName的Clone方法：

[ContentProperty("Children")]

     public class ModelVisual3DWithName : ModelVisual3D, ICloneable
    {
         public string Name { get; set; }

         public object Tag { get; set; }

         public object Clone()
        {
             var model = new ModelVisual3DWithName { Content = Content.Clone(),
                                                    Name = Name,
                                                    Tag = Tag
                                                   };
            model.SetColor(Brushes.DefaultSectionBrush);
             return model;
        }

         public void SetMaterial(Material material)
        {
             var geometrymodel = Content as GeometryModel3D;
             if (geometrymodel != null)
            {
                geometrymodel.Material = material;
            }
             else
            {

            }
        }

         public Material GetMaterial()
        {
             var geometrymodel = Content as GeometryModel3D;
             if (geometrymodel == null)
            {
                 return null;
            }
             return geometrymodel.Material;
        }

         public void SetColor(Brush color)
        {
             var geometrymodel = Content as GeometryModel3D;

             if (geometrymodel.Material is MaterialGroup)
            {
                 var materialGroup = geometrymodel.Material as MaterialGroup;
                SetMaterialGroupColor(materialGroup, color);
            }
             else
            {
                DiffuseMaterial material = geometrymodel.Material as DiffuseMaterial;
                 if (material != null && !material.IsFrozen)
                {
                    material.Brush = color;
                }
            }
        }

         private   void SetMaterialGroupColor(MaterialGroup materialGroup, Brush color)
        {
             foreach ( var groupItem in materialGroup.Children)
            {
                 if (groupItem is DiffuseMaterial && !groupItem.IsFrozen)
                {
                     var tmpItem = groupItem as DiffuseMaterial;
                    tmpItem.Brush = color;
                }
            }
        }
    }

3）. 將剛才克隆的模型添加到容器中。

調用world.children.Add()方法添加模型到容器中，邏輯如下：

var findModel = _baseModel.Find(modelName) as ModelVisual3DWithName;

if (findModel != null)
{
model.Children.Add(findModel.Clone() as ModelVisual3DWithName);
}
world.Children.Add(findModel);

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