Particles not blending with fog

Troubleshooting graphics
1

Hi all,



My particles arent blending properly with the background fog, where the particles arent in the fog ( or when i turn the fog off )they are ok.

http://img2.freeimagehosting.net/image.php?266492d5c1.jpg



for the particles i use the standard snow from renParticleEditor



here is my setup


private void buildFog()
   {
      fs = display.getRenderer().createFogState();
      fs.setDensity(0.2f);
      fs.setColor(new ColorRGBA(0.5f, 0.5f, 0.7f, 0.4f));
      fs.setEnd(1000);
      fs.setStart(300);
      fs.setEnabled(true);
      fs.setDensityFunction(FogState.DF_LINEAR);
      fs.setApplyFunction(FogState.AF_PER_VERTEX);
      rootNode.setRenderState(fs);
      rootNode.updateRenderState();
   }



   private void buildSnow()
   {
      snowNode = new Node("snow node");
      try
      {

         Spatial snow = (Spatial) BinaryImporter.getInstance().load(
               Thread.currentThread().getContextClassLoader()
                     .getResourceAsStream("effects/snow.jme"));
         snowNode.attachChild(snow);

         ZBufferState zbuf = DisplaySystem.getDisplaySystem().getRenderer()
               .createZBufferState();
         zbuf.setWritable(false);
         snowNode.setRenderState(zbuf);
         snowNode.updateRenderState();
         
         rootNode.attachChild(snowNode);
      }
      catch (IOException ex)
      {
         ex.printStackTrace();
      }
   }



i also render the rootNode in the opaque que and im using baseGame.

what am i missing here ?
2

Maybe play with the alpha blend in the particles?

3

I allready tried to apply an alphastate but this has no positive effect ( i can brake it further by incorrect blending, but i cant fix it ).


private void buildSnow()
   {
      AlphaState as = display.getRenderer().createAlphaState();
      as = DisplaySystem.getDisplaySystem().getRenderer().createAlphaState();
      as.setBlendEnabled(true);
      as.setSrcFunction(AlphaState.SB_SRC_ALPHA);
      as.setDstFunction(AlphaState.DB_ONE);
      as.setTestEnabled(true);
      as.setTestFunction(AlphaState.TF_GREATER);
      as.setEnabled(true);

      snowNode = new Node("snow node");
      try
      {

         Spatial snow = (Spatial) BinaryImporter.getInstance().load(
               Thread.currentThread().getContextClassLoader()
                     .getResourceAsStream("effects/snow.jme"));
         snowNode.attachChild(snow);

         ZBufferState zbuf = DisplaySystem.getDisplaySystem().getRenderer()
               .createZBufferState();
         zbuf.setWritable(false);
         zbuf.setEnabled(true);
         snow.setRenderState(as);
         snow.setRenderState(zbuf);
         snow.updateRenderState();
         rootNode.attachChild(snowNode);
      }
      catch (IOException ex)
      {
         ex.printStackTrace();
      }

      snowNode.setRenderQueueMode(Renderer.QUEUE_TRANSPARENT);
   }



I dont think the blending of the particles itself is wrong as it working correct without the fog, my guess is i'm missing something else
4

Did you play with different values for the AlphaStates DstFunction ?




5

yes i tried several values and all i got was a complete black particle or no visible particle at all

6

For now i just fixed it by moving the snow to a higher level node than the fog, but i would still like to understand why it diddent work/ what i was doing wrong