###### Descriptions and Examples for the POV-Ray Raytracerby Friedrich A. Lohmüller     3D Animations with POV-Ray         Some basics and examples on animations.
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3D Animation Tutorial
Index of Content
0. Basic Knowledge
1. Basic Example
2. Example 2
3. Images to Animated Gif
4. From Images to Video
5. Basic Terms
6. Animation Commands
I. Cyclic Animations
1. Rotating Objects
1.2. Planets in Orbit
1.3. Clock Animation
2. Rotating Camera
2.1. Straight Moving Camera
3. Western Wheel
Problem
3.1. Rolling Wheels
4. Gears
4.1. Roller Chain
4.2. Bike Chain
5. Swinging Pendulum
> 5.2. Rock the Rocker
6. Spiral Pendulum
7. Coupling Rods
7.1. Connecting Rods
8. Psychedelic + Op-Art
9. Counters + Countdowns
10. Folding of a Cube
II. Non-linear Movements
1.0 Speed Up/Slow Down 1
1.1 Speed Up/Slow Down 2
2. Fall + Bounce
3. Acceleration by
physical Formulas
4. Speed Controll by
Spline Functions
III. Animation Paths
with Spline Curves
1. Spline Curves
2. Closed Splines
3. Animation Paths

Rock the Rocker!
A Rocking Chair rolling in a sinus rhythm.

A Rocking Chair in Action
At first sight a rocking rocker seams to be something like a swinging Pendulum.
But if you look more thoroughly, we can recognize that this is more like a rolling wheel, which rolls forward and backward and this in a sinus rhythm.

Here a simplified Rocker reduced to a single skid as a macro object.
For the complete Rocker object see the scene file below!
 ```#macro Rocker0( Rocking_Angle ) //--------------------------------- #local D = 0.00001; // just a little bit! #local R_R = 1.20; // rocker skids radius #local R_rotate = 25; // skids angle +/- #local D_feet = 0.055; //--------------------------------------- #local Skid = intersection{ box{<-R_R,-R_R-D,-D_feet/2-2*D>, <0,R_R+D,D_feet/2+2*D> rotate<0,0,-R_rotate> inverse } box{<-R_R,-R_R-D,-D_feet/2-2*D>, <0,R_R+D,D_feet/2+2*D> rotate<0,0,-R_rotate> inverse scale<-1,1,1> } cylinder{<0,0,-D_feet/2>, <0,0,D_feet/2>, R_R} cylinder{<0,0,-D_feet/2-D>, <0,0,D_feet/2+D>, R_R-D_feet inverse } } // end intersection Skid //--------------------------------------- object{ Skid rotate< 0,0,Rocking_Angle> translate< 0, R_R, 0> // move by the // according part of the circumference: translate <-(2*pi*R_R)*(Rocking_Angle/360),0,0> } // end of Skid #end // end of macro Rocker0() ----------```

A Rocking Chair in Action           How to rock a rocking chair.

The rocking skid of 'Rocker0' example.
And here how to use this macro Rocker0():
 ```#declare Time = clock + 0.00; //--------------------------------------- object{ Rocker0( 12* sin(Time*2*pi) ) texture{ pigment{ color rgb<0.2,0.12,0.08>} finish { phong 1 reflection 0} } // end of texture rotate<0,0,0> translate<0,0,0> } // end of Rocker0 ---------------------```
###### Scene files for the above skid demo in POV-Ray: "Rocker0.ini" and "Rocker0.pov"
Rocking Chair 'Rocker_01'

Scene files for a complete
rocking chair in POV-Ray:
"Rocker_01.ini" and "Rocker_01.pov"
Bigger animations of rocking chairs
you'll find in my Gallery of 3D Animations - Oszillations
.

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