GPU-only reads: Niagara

1. Set up the parameter

Create a one-slot ledger key using Share a color on the GPU. Set your emitter to GPU Compute Sim and spawn one particle. Add a user parameter of type Pixel Era GPU Ledger. Assign its Ledger, Request Key, and Source Texture.

12

1. 1
   Assign the ledger

   Use the asset containing SharedColor.
2. 2
   Choose the source

   Required for Read Global; not required for Receive.

2. Read and use the color

Add Pixel Era: Read Global in Particle Update. Bind GPU Ledger to your user parameter, set UV, and keep Key Offset at 0. Add a later Set Particles.Color module and bind its color to Read Global’s Output Color.

12

1. 1
   Bind the user parameter

   ProbeLedger is this example’s user parameter.
2. 2
   Use Output Color

   Bind it to Particles.Color or another compatible input.

Receive an existing key

Use Pixel Era: Receive instead, bound to the ledger parameter. Its Output Color works the same way.

1

1. 1
   Receive the shared value

   Bind Output Color in the same way.