<p>I'm trying to render a single vector layer that has overlapping polygons, but I cant seem to get the settings correct for what I want. There are overlapping polygons on the layer, and I would like them to each be drawn transparently so that I can see the overlapping regions. However, no matter what I try I can't seem to get this effect and the rendering will make the shapes draw over each other. </p>
<p> </p>
<p>I'm using Mapserver 6.0.1</p>
<p> </p>
<p>OUTPUTFORMAT </p>
<p><span style="white-space: pre;"> </span>NAME "png" </p>
<p><span style="white-space: pre;"> </span>DRIVER AGG/PNG </p>
<p><span style="white-space: pre;"> </span>MIMETYPE "image/pngt" </p>
<p><span style="white-space: pre;"> </span>IMAGEMODE RGBA </p>
<p><span style="white-space: pre;"> </span>EXTENSION "png" </p>
<p><span style="white-space: pre;"> </span>FORMATOPTION "GAMMA=1.0" </p>
<p><span style="white-space: pre;"> </span>TRANSPARENT TRUE</p>
<p>END</p>
<p> </p>
<p>I have a very simple class for my layer</p>
<p>  CLASS<span> </span></p>
<p><span> </span><span style="white-space: pre;"> </span>STYLE<span> </span>  </p>
<p><span style="white-space: pre;"> </span>OPACITY 25<span> </span>  </p>
<p><span style="white-space: pre;"> </span>COLOR [color]<span> </span>  </p>
<p><span style="white-space: pre;"> </span>OUTLINECOLOR -1 -1 -1     </p>
<p><span style="white-space: pre;"> </span>ANTIALIAS TRUE   </p>
<p><span style="white-space: pre;"> </span>END<span> </span></p>
<p><span> </span><span style="white-space: pre;"> </span>LABEL     </p>
<p><span style="white-space: pre;"> </span>COLOR  0 0 255     </p>
<p><span style="white-space: pre;"> </span>OUTLINECOLOR 250 250 250     </p>
<p><span style="white-space: pre;"> </span>OUTLINEWIDTH 3     </p>
<p><span style="white-space: pre;"> </span>FONT stMYFont     </p>
<p><span style="white-space: pre;"> </span>TYPE truetype     </p>
<p><span style="white-space: pre;"> </span>SIZE 9     </p>
<p><span style="white-space: pre;"> </span>POSITION AUTO     </p>
<p><span style="white-space: pre;"> </span>PARTIALS FALSE     </p>
<p><span style="white-space: pre;"> </span>MINFEATURESIZE AUTO   </p>
<p><span style="white-space: pre;"> </span>END </p>
<p> END</p>
<p> </p>