3D is not rendering in WPF Application -

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i trying render 3d object using below code. when run application, nothing displayed. seems blank. missing anything?

<page x:class="samplewpfapplication.demopage3" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" title="demopage3" xmlns:my="clr-namespace:samplewpfapplication"> <grid>     <grid.rowdefinitions>         <rowdefinition height="126*" />         <rowdefinition height="126*" />         <rowdefinition height="66" />     </grid.rowdefinitions>     <viewport3d x:name="theview3d">         <viewport3d.camera>             <perspectivecamera position="6,6,6" lookdirection="-4,-4,-4" updirection="0,1,0" />         </viewport3d.camera>                  <modelvisual3d x:name="themodel">             <modelvisual3d.content>                 <model3dgroup>                     <geometrymodel3d x:name="thegeometry">                         <geometrymodel3d.geometry>                             <meshgeometry3d positions="0,1,0 1,-1,1 -1,-1,1 1,-1,-1 -1,-1,-1"         normals="0,1,0 -1,0,1 1,0,1 -1,0,-1 1,0,-1"         triangleindices="0,2,1 0,3,1 0,3,4 0,2,4" />                         </geometrymodel3d.geometry>                         <geometrymodel3d.material>                             <diffusematerial>                                 <diffusematerial.brush>                                     <solidcolorbrush color="red" opacity="0.9"/>                                 </diffusematerial.brush>                             </diffusematerial>                         </geometrymodel3d.material>                         <geometrymodel3d.backmaterial>                             <diffusematerial>                                 <diffusematerial.brush>                                     <solidcolorbrush color="green" opacity="0.9"/>                                 </diffusematerial.brush>                             </diffusematerial>                         </geometrymodel3d.backmaterial>                     </geometrymodel3d>                 </model3dgroup>             </modelvisual3d.content>         </modelvisual3d>         <modelvisual3d>             <modelvisual3d.content>                 <model3dgroup>                     <directionallight direction="0,-5,-2" />                     <directionallight direction="3,2,2" />                     <geometrymodel3d x:name="thegeometry2">                         <geometrymodel3d.transform>                             <scaletransform3d scalex="2" scaley="2" scalez="2"></scaletransform3d>                         </geometrymodel3d.transform>                         <geometrymodel3d.geometry>                             <meshgeometry3d positions="0,1,0 1,-1,1 -1,-1,1 1,-1,-1 -1,-1,-1"         normals="0,1,0 -1,0,1 1,0,1 -1,0,-1 1,0,-1"         triangleindices="0,2,1 0,3,1 0,3,4 0,2,4" />                         </geometrymodel3d.geometry>                         <geometrymodel3d.material>                             <diffusematerial>                                 <diffusematerial.brush>                                     <solidcolorbrush color="#7fb0c4de" opacity="0.9"/>                                 </diffusematerial.brush>                             </diffusematerial>                         </geometrymodel3d.material>                         <geometrymodel3d.backmaterial>                             <diffusematerial>                                 <diffusematerial.brush>                                     <solidcolorbrush color="#7fb0c4de" opacity="0.9"/>                                 </diffusematerial.brush>                             </diffusematerial>                         </geometrymodel3d.backmaterial>                     </geometrymodel3d>                 </model3dgroup>             </modelvisual3d.content>         </modelvisual3d>     </viewport3d>        </grid> </page>

it appears render fine me in kaxaml.

perhaps should try different machine or use kaxaml see if result @ all. @ point, number of things.

edit: noticed didn't copy grid.rowdefinitions. when add them, clips viewport. if remove those, work?


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