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Interesting effects can be achieved when a "trail" is added to some or all particles, visually marking the path the particle has followed during its lifetime. Explore this by making the following changes to the fountain scene:

1. Create a new yellow Material named m_yellow.
2. In the Hierarchy window, select the fountain's Particle System. Then, in the Inspector window, enable the Trails module.
3. You'll now see a new property for the Renderer module named Trail renderer. For this property, select the new m_yellow Material.
4. For the Trails module, set the following options to make every 100th particle leave a thin trail behind it:
   • Ratio: 0.01 (1 out of 100 get a trail)
   • Width over Trail: 0.1 (narrow):

Figure 14.28 – Adding occasional Trails to particles from our fountain