how do I make it so the transparency in the imported image, is visible in the generated particles?
Pre-compose the keyed layer.
What 3D fileformats are supported out of the box to be used with AE and Trapcode Particular
There are none. Neither AE nor Particular support 3D geometry.
Hi Mylenium, thanks for feedback, but I'm still stuck...
You said: "Pre-compose the keyed layer"
I have tried that.
The generated particles still show the image with the white background...
Could need some suggestions on how to proceed
didi you make sure to use the Move attributes option when pre-composing? Other than that this may be due to some oddities with the GIF itself. If you can, open it in Photoshop, convert to RGB mode, create the transparency and then save it as a PSD, PNG or TIF. This might prove easier than spending endles hours trying to get it working in AE....
That did the trick, "open gif image in Photoshop, convert to RGB, save as PNG.....
You saved me from a creeeping headace here