okay, im trying to create a simple animation where two balls roll into
each other.  My problem is that when the ball rotates 360 degrees it
rotates really weird.  Ive been playing with the code for awhile and I
can't figure it out.  here my source code:


#include "colors.inc"
#include "textures.inc"

camera
{
  location  <0.5 , 0.0 ,-10.0>
  look_at   <0.5 , 0.0 , 0.0>
}

background {SlateBlue }

light_source
{
  0*x
  color rgb 1.0
  area_light
  <8, 0, 0> <0, 0, 8>
  4, 4
  adaptive 0
  jitter
  translate <40, 80, -40>
}

//#declare ground =
box
{
  <-1, -1, -1>
  < 1,  1,  1>
  pigment { Orange }
  scale 10
  translate -15*y
  scale <20,0,20>
  translate 4*y
}

//#declare MainBall =
sphere
{
  <10, 0, 0>
  1
  finish {phong 1 phong_size 90}
  pigment {checker Violet,Yellow rotate y*(clock*360)}
  translate x*(clock*-8)
}

//#declare MainBall2 =
sphere
{
  <-10, 0, 0>
  1
  finish {phong 1 phong_size 90}
  pigment {checker Black,Yellow rotate y*(clock*360)}
  translate x*(clock*10)
}

//#declare hole =
//cylinder
//{
//  0*x,  5*x,  2
//  pigment {Yellow}
//  rotate 90*z
//  translate <3,-5.99,0>
//}

//difference {
//  object{ ground }
//  object{ hole }}

//#declare holelight =
//cone
//{
//  1*y,  0.0,
//  -1*y, 1.0
//  pigment {Yellow}
//  scale .5
//  translate <3,-1,0>
//  rotate 180*z
//  translate <6,-2,0>
//  scale 2
//  translate -3*x
//  translate -3*y
//}

//union {
//    light_source { <2,-2,0> color White }
//    object { holelight } no_shadow translate 1*y
//  }

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