Do you need to use Mantra PBR to render curves correctly?

[magneto]

Hi,

When I render curves, I always used to get horizontal lines along the length of the curves like this:

I realized when I changed the Rendering Engine to "PBR", then I get correct results. Not even Micropolygon PBR works. Is this due to the nature of Micropolygon/non-PBR renderers?

Would love to hear some insight regarding this, because I thought I was somehow setting up the curves incorrectly before.

Thanks

[anim]

it's not PBR

raytracing based engines (so PBR and raytrace) can sample each hit point of the curve independently whereas micropoly based engines take one sample over full width of the curve

so to get the same result for micropoly or PBR micropoly you need to

check Shade Curves As Surfaces on Dicing tab of your curve object, it's more expensive than not doing that but it seems to be necessary if you need that amount of detail in micropoly

Edited May 23, 2013 by anim

[magneto]

Thanks anim. I didn't know about that rendering parameter for geometry objects. When I use micropolygon with that option, the shape of the curves seem different . I will have to experiment with it.

But in general would you recommend just using PBR for curves? I imagine that's what most people use most of the time because you seem to get better result in less time like you said.