[mapserver-users] style level opacity issue

[lists at killface.org]

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.  

I'm using
Mapserver 6.0.1 

OUTPUTFORMAT  

 NAME "png"  

 DRIVER AGG/PNG  


MIMETYPE "image/pngt"  

 IMAGEMODE RGBA  

 EXTENSION "png"  


FORMATOPTION "GAMMA=1.0"  

 TRANSPARENT TRUE 

END 

I have a very
simple class for my layer 

 CLASS  

  STYLE   

 OPACITY 25   

 COLOR
[color]   

 OUTLINECOLOR -1 -1 -1  

 ANTIALIAS TRUE  

 END  

  LABEL


 COLOR 0 0 255  

 OUTLINECOLOR 250 250 250  

 OUTLINEWIDTH 3  


FONT stMYFont  

 TYPE truetype  

 SIZE 9  

 POSITION AUTO  


PARTIALS FALSE  

 MINFEATURESIZE AUTO  

 END  

 END 

 
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