Version: SU13 - 1.34.16.0
Frequency: Consistently
Severity: Mellow Yellow Level 
Context: When in the VFX Editor
Bug description: GetParticleAttribute → AgeOverLifetime (or anything other parameter) doesn’t work on Deformation and Blur input in the Output node. When GetParticleAttribute is in present, result will always be zero.
Repro steps: Create some nodes driven by GetParticleAttribute and connect them to the Deformation and Blur inputs.
Attachments:
Same with EmissiveColor
Hello @runshotgun
Thank for your bug report, this has been logged on our side.
Regards,
Hello @runshotgun ,
This is by design. The properties of the Output block of a visual effect graph are applied to the effect as a whole, not to individual particles. Therefore nodes that relate to a specific particle (GetParticleAttribute, GetGroundAttribute, SampleNoise, AtlasPlayer) do not work when they are part of a graph plugged into the Output block, and the whole graph outputs no value.
Regards,
Matthieu
properties of the
Outputblock of a visual effect graph are applied to the effect as a whole, not to individual particles
If I attach GetParticleAttribute > AgeOverLifetime to the Output > Color.z (alpha) then particles will appear smoothly during lifetime. That is expected behaviour, not sure what intentions was to not make the same for other Output parameters.
Thank you for your reply.
Can you explain why the following layout works properly on the Color property?
Hello again,
The Color property is the exception that I forgot to mention here 
The reason is that it is expensive to send data for individual particles to the GPU, therefore we have made the choice to make some properties related to the whole effect to reduce CPU-GPU communication cost.
If it is important to you that some of these properties are made available on a “by particle” level, feel free to make an Idea post on this forum 
Regards,
Matthieu
