Found it, Randomness attribute was .2

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adding a dynamic operator to the stack gives me this error
// Warning: Ornatrix: Your video card does not have enough resources available. Check that it supports CUDA Compute Capability 3 or newer and has enough VRAM available. Also try increasing max. particle count. //

I have a Quadro 4000 card 6gb.

thanks mate. I swear it feels like I'm losing my mind sometimes, some of these errors pop up than disappear. At a guess I reckon Redshift is stealing all the memory so it can't perform the dynamics. I tried unloading Redshift and creating a scene from scratch but I get the same error. What is the maximum particle count and where do I modify it?

Anywayso, removing randomness made the sphere nice and round but it had 300 guides - way too many to be managable so I dropped it down to a more practical 30 and I get the same spikiness in the hairs. guides are set to uniform distribution, interpolation is affine, 3 guides.

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no map is present

seems to be happening on all interpolation methods except for polar - polar works fine on a sphere but does not work well with UV mapped geometry

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it was just a default sphere, add hair, nothing extra.

In relation to the cuda error - I can get a hold of a Quadro K4000, but would a card with only 3gb memory be enough to simulate a toony character with 800 guides at detail level 20?

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The guides were on uniform but hair is on random. Are you saying the other modes are broken and I can't use them? Why doesn't it interpolate as expected?

all of these methods should produce a round sphere, I don't want uniformity I just want roundness. it looks like they are interpolating from strand tip to tip in a linear way, not taking into account the topology of the surface between those guides, which causes those straight edges in the fur.

yes, that is the setting already. 0 randomness, random face (or area), three guides, Barycentric

If I use Vertex distribution in the GuidesFromMesh - or - if I use polar Interpolation in the HairFromGuides I get a round sphere, all of the other options produce straight edges.