Rotation and translation coupled together such as that of a ball rolling
along a floor takes the use of  pi*(BallRadius*2)=Dist  then translate Dist*x
for example.
Just a matter of moving along the same distance as the circumference of the
sphere.  If more than one roll (>360 degrees) then you would just multiply
that amount by Dist.  720 degrees becomes 2*Dist*x

Bob

"SHELLEY" <SHE### [at] prodigynet> wrote in message
news:3907A02F.2A7AFFE7@prodigy.net...
| 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>
| }
|
| file://#declare ground =
| box
| {
|   <-1, -1, -1>
|   < 1,  1,  1>
|   pigment { Orange }
|   scale 10
|   translate -15*y
|   scale <20,0,20>
|   translate 4*y
| }
|
| file://#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)
| }
|
| file://#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)
| }
|
| file://#declare hole =
| file://cylinder
| file://{
| //  0*x,  5*x,  2
| //  pigment {Yellow}
| //  rotate 90*z
| //  translate <3,-5.99,0>
| file://}
|
| file://difference {
| //  object{ ground }
| //  object{ hole }}
|
| file://#declare holelight =
| file://cone
| file://{
| //  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
| file://}
|
| file://union {
| //    light_source { <2,-2,0> color White }
| //    object { holelight } no_shadow translate 1*y
| //  }
|

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