The first part of the CG Academy series on pflow. I noticed that this was not posted so thought i would post it.
CG Academy - Particle.Flow_01_Principles and Workflow @ cg academy
Now all 5 are on this site.
01_Principles and Workflow (this thread)
02_Operators_01
03_Operators_02
04_Test Forces and Collisions
05_Practical Examples

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