In order to create the light orbs I mentioned in the storyboard. I decided to project the spotlight with colour curves onto a sphere and by key-framing the position of the spotlight, I was able to change the colour of the orb. I then rendered out the colour as a tiff sequence, which is ready to be placed into a particle system via "particle instancing".
However, due to the change of position of the spotlight, the size of the orb seems vary unstable. Also that there is not a lot of controls of the look of the glowing effect by projecting the light onto a sphere.
As a result, I decided to keep the spotlight stationary as the light is being projected onto a lambert plane. I then key-framed the plane to approach the light and key-frame the cone of angle of the spotlight at the same time to keep the shape of the orb constant shown above. This method works better than the previous ones in my opinion.
Above images are renders of various key-frames, which I set in order to keep the size of the light orb image constant and also the colour variation.
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