I'm trying to make a lathe object from some data points. My data points look
quite smooth, but the generated lathe object looks not smooth, it looks kind of
like be constructed from flat rings. Do you know why the lathe object is not
smooth and how to solve this problem? I tried different kind of spline but that
doesn't help.
Any suggestions and comments are appreciated.

This is how the data points look like

http://imgur.com/Vkkk5Rq

and this is how the lathe object looks like

http://imgur.com/2UxKgwD

This is the code I used:

#include "colors.inc"

global_settings {
  max_trace_level 5
  assumed_gamma 1.0
  radiosity {
    pretrace_start 0.08
    pretrace_end   0.01
    count 35
    nearest_count 5
    error_bound 1.8
    recursion_limit 2
    low_error_factor .5
    gray_threshold 0.0
    minimum_reuse 0.015
    brightness 1
    adc_bailout 0.01/2
  }
}

#default {
  texture {
    pigment {rgb 1}
    finish {
      ambient 0.0
      diffuse 0.6
      specular 0.6 roughness 0.001
      reflection { 0.0 1.0 fresnel on }
      conserve_energy
    }
  }
}


/*ViewPoint*/
camera {
 location <13., 13., 13.>
 direction <-26., 36., -58.>
 up <0, 0, 28.284271247461902>
 right <37.61808075912433, 0, 0>
 sky <0.2, -1., 0.2>
 look_at <0., 0., 0.>
}

light_source { <250,350,450> 1 }
background { rgb <0,.25,.5> }






lathe{
cubic_spline
73,
<0.0000000,-2.3501925>,
<0.1685586,-2.3471675>,
<0.3384681,-2.3352277>,
<0.5025126,-2.3193158>,
<0.6623041,-2.2934823>,
<0.8291457,-2.2657324>,
<0.9705252,-2.2298038>,
<1.1306533,-2.1905154>,
<1.2814070,-2.1449947>,
<1.4321608,-2.0958930>,
<1.5829146,-2.0454749>,
<1.7336683,-1.9837390>,
<1.8764567,-1.9254786>,
<2.0351759,-1.8630373>,
<2.1615910,-1.8074713>,
<2.3252519,-1.7359309>,
<2.4874372,-1.6679285>,
<2.6288118,-1.6080402>,
<2.7852697,-1.5504389>,
<2.9396985,-1.4933077>,
<3.0978375,-1.4572864>,
<3.2591998,-1.4212990>,
<3.4170854,-1.4017828>,
<3.5916831,-1.4044717>,
<3.7437186,-1.4251713>,
<3.8944724,-1.4653893>,
<4.0539017,-1.5248889>,
<4.1959799,-1.6137235>,
<4.3409756,-1.7200588>,
<4.4743016,-1.8592965>,
<4.6163983,-2.0234848>,
<4.7487437,-2.2505084>,
<4.8574476,-2.4961601>,
<4.9359064,-2.7412525>,
<4.9876708,-3.0150754>,
<5.0140378,-3.3387585>,
<5.0077025,-3.6683417>,
<4.9750873,-3.9702752>,
<4.9120603,-4.2696488>,
<4.8287998,-4.5319714>,
<4.7236181,-4.8090473>,
<4.5979899,-5.0723540>,
<4.4723618,-5.2896726>,
<4.3560994,-5.4773869>,
<4.2211055,-5.6564373>,
<4.0866532,-5.8291457>,
<3.9447236,-5.9817754>,
<3.8141557,-6.1207737>,
<3.6902421,-6.2376063>,
<3.5427136,-6.3657681>,
<3.4037462,-6.4824121>,
<3.2662707,-6.5830365>,
<3.1155779,-6.6935168>,
<2.9666208,-6.7875129>,
<2.8140704,-6.8794731>,
<2.6757471,-6.9595345>,
<2.5230114,-7.0351759>,
<2.3755442,-7.1082081>,
<2.2293408,-7.1722494>,
<2.0831286,-7.2315838>,
<1.9369164,-7.2909182>,
<1.7839196,-7.3408775>,
<1.6337754,-7.3881538>,
<1.4813898,-7.4351413>,
<1.3236470,-7.4714147>,
<1.1714835,-7.5062791>,
<1.0060412,-7.5397206>,
<0.8525576,-7.5628141>,
<0.6909548,-7.5866095>,
<0.5350931,-7.6028495>,
<0.3654070,-7.6152361>,
<0.2010050,-7.6261323>,
<0.0307615,-7.6269192>
 sturm

 texture{
       pigment{color White}
       finish { phong 0.5}}
  }

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