[Bf-funboard] Particles sensitive to light?

[joeedh]

Just did it, heres a quickly-written, sloppy horrible mini-tutorial:

1. Create a spot light, a plane (floor) and a halo object to be 
shadow-ified.

2. Create a Copy Rotation and Copy Location constraints for the camera.

3. Have the constraints point to the spotlight (the camera should now be 
looking the same direction as the light).

4. Turn the halo's color to black.

5. Put the halo object in it's own layer and set the world background to 
white.

6. Render, and save the image as shadowbuff.jpg (or whatever you want).

7. Add a image texture to the materials of all the object near the 
halo.  Load shadowbuff.jpg.  Enable UseAlpha, CalcAlpha and NegAlpha.

8. In the materials Map To section, click the Object Map-To button and 
have the image map to the spotlight.  Next, set sizex, sizey and sizez 
to something small like 0.15 (not sure why this is necassary).

7. Render away!  The halos now have shadows!  See attached image.
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