The original inspiration is this picture. I tried to make something… feminine.

download trail effect hip

The trail effect is a Houdini softbody.

And, custom x-ray shader.


The key idea of this shader is multiplying U or V to normal falloff and putting them to the different channel.

B channel : x-ray	R channel : x-ray * U
G channel : x-ray * V	R+G+B

Houdini provides an easy way to control particle color.
The particle color is connected to COP image, and I animated the image instead of making a complex expression.