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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
// }
Post a reply to this message
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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] prodigy net> 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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SHELLEY <SHE### [at] prodigynet> wrote:
: sphere
: {
: <10, 0, 0>
==
: pigment {checker Violet,Yellow rotate y*(clock*360)}
=========
Can we see the problem here?
(Hint: Rotation is always made around the axes)
--
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
Post a reply to this message
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But that rotation is done before the translation - shouldn't be a problem...
Perhaps Shelley can post the animation - for me, a picture will tell me more
than the code...
--
Mike
wk: mik### [at] pyxiscom www.pyxis.com
hm: mwe### [at] sciticom www.geocities.com/mikepweber
"Warp" <war### [at] tagpovrayorg> wrote in message
news:390832a3@news.povray.org...
> SHELLEY <SHE### [at] prodigynet> wrote:
> : sphere
> : {
> : <10, 0, 0>
> ==
>
> : pigment {checker Violet,Yellow rotate y*(clock*360)}
> =========
>
> Can we see the problem here?
>
> (Hint: Rotation is always made around the axes)
>
> --
> main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
> ):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
Post a reply to this message
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There were a few things wrong, but to simplify it might be easier to compare
this with the other. Far as the math goes on this I'm no mathematician so this is
all I came up with. I'm not sure of the intent for this animation because one of
these balls rolls over a hole and doesn't fall in :-) Up to you I guess.
#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 <20,1,20> // can't scale by 0, y changed to 1
translate 4*y
}
/* Amount of movement needs to be calculated first.
In this case it's -8*x and 10*x, or Dist*x
meaning the Rolls need to make abs(Dist)/(Rolls*(Radii*2*pi))
equivalent to 1.
Example: abs(-8)/(1.2725*(1*2*pi)) = 1
*/
#declare Rolls1=1.2725; // number of rolls
#declare Rolls2=1.59; // number of rolls
#declare Radii1=1; // ball radius
#declare Radii2=1; // ball radius
#declare MainBall =
sphere // +z rotation on y plane, -x direction
{
0, // don't translate first or texture will be offset
Radii1
finish {phong 1 phong_size 90}
pigment {checker color Violet, color Yellow}
// typically the object is rotated, not just the texture
rotate +z*(clock*Rolls1*360)
translate <10,0,0>-x*(clock*(Rolls1*((Radii1*2)*pi)))
}
MainBall // here's 1st object
#declare MainBall2 =
sphere // -z rotation on y plane, +x direction
{
0, // don't translate first or texture will be offset
Radii2
finish {phong 1 phong_size 90}
pigment {checker color Black, color Yellow}
// typically the object is rotated, not just the texture
rotate -z*(clock*Rolls2*360)
translate <-10,0,0>+x*(clock*(Rolls2*((Radii2*2)*pi)))
}
MainBall2 // here's 2nd object
#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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On Thu, 27 Apr 2000 07:16:31 -0700, "Mike Weber"
<mik### [at] pyxiscom> wrote:
>But that rotation is done before the translation - shouldn't be a problem...
The sphere is already translated -- it's center is at <10,0,0>.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG e-mail : pet### [at] tagpovrayorg
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hmmm... I don't have the code anymore... I must have missed that. I sure
would like to see the animation....
--
Mike
wk: mik### [at] pyxiscom www.pyxis.com
hm: mwe### [at] sciticom www.geocities.com/mikepweber
"Peter Popov" <pet### [at] usanet> wrote in message
news:5f9hgsgedmq2t9ea84oir84an1iqqips6q@4ax.com...
> On Thu, 27 Apr 2000 07:16:31 -0700, "Mike Weber"
> <mik### [at] pyxiscom> wrote:
>
> >But that rotation is done before the translation - shouldn't be a
problem...
>
> The sphere is already translated -- it's center is at <10,0,0>.
>
>
> Peter Popov ICQ : 15002700
> Personal e-mail : pet### [at] usanet
> TAG e-mail : pet### [at] tagpovrayorg
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