I am using a hair/particle system but all of the hairs look like spikes not hair:
How can I set it so they all have a consistent thickness and how can I adjust the thickness?
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The setting for hair particles in cycles are in Particles > Cycles Hair Rendering and Particles > Cycles Hair Settings.
To make the hairs a constant thickness, set the root and tip thickness settings to the same value and disable Close Tip:
To get a cylinder-like result, you will also have to disable Particles > Cycles Hair Rendering > Cull Back-faces so the backs of faces are not hidden: