To make the points render with size, Arnold Properties need to be added.

• At scene level select the particle_fireworks node and tab > Arnold > Add Arnold Properties (or from the Arnold toolbar).

• This will add another tab to the Parameter Editor called Arnold. Under here is a tab called Shapes and Points, which will control how the points are translated.

• By default the points Mode is Disk. Render again to see the difference.

• They are definitely visible now! The size of the disk can be changed with the Default Radius parameter. Decrease this to 0.01.

• It's a better size but all the points are the same size. They would look better if the size was varied. This can be done by overriding the radius of the disk based on the life of the particle.
• Enter the particle_fireworks node and add an Attribute Create node after the popnet1. The Name of the attribute is ar_radius. Set the Default to 0.01 and the Value to $LIFE/50.

Now the disks increase in size over the life of the particle.

End of Part 2

In the next section color will be added to the render.