SceneControl如何实现线状要素符号化？

我像MapControl那样做的 为什么实现不了呢？<br/>   Dim pColor As IColor<br/>        Dim lyr As IGeoFeatureLayer<br/>        lyr = Me.AxSceneControl1.Scene.Layer(0)<br/>        Dim pSLineSymbol As ISimpleLineSymbol<br/>        Dim pSimpleRender As ISimpleRenderer<br/>        pSLineSymbol = New SimpleLineSymbol<br/>        pColor = New RgbColor<br/>        pColor.RGB = RGB(255, 0, 0)<br/><br/>        With pSLineSymbol<br/>            .Color = pColor<br/>            .Style = esriSimpleLineStyle.esriSLSDot<br/>            .Width = 2<br/>        End With<br/>        pSimpleRender = New SimpleRenderer<br/>        pSimpleRender.Symbol = pSLineSymbol<br/>        lyr.Renderer = pSimpleRender

<p>我加上下面两句代码就可以了</p>
<p><font face="Verdana">  Me.AxSceneControl1.Scene.SceneGraph.Invalidate(lyr, True, False)<br/>        Me.AxSceneControl1.Scene.SceneGraph.RefreshViewers()</font></p>
<p>不过实现的效果怎么是一些不连续的点？太别扭了？？</p>
<p><img src="http://bbs.esrichina-bj.cn/ESRI/attachment.php?aid=MTQzMTc0fGU4MTlhMmQwfDEzMjE5MjY4OTR8M2E4N1VpUmlXbFpUaHd6LzhaWGdhSVRXTlp6d0ZZVU1GdVFJNkJhcHV4MlBNSjQ%3D;noupdate=yes"/></p>
<p> </p>

<p>重新修改线的样式</p><p>修改这行：<strong> .Style = esriSimpleLineStyle.esriSLSDot<br/></strong></p>