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Dave

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Joined: 25/02/2015

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Animated Atomic Model

18/07/2016 - 09:03:56
H2O experience

08/07/2016 - 12:12:45

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Animated Atomic Model

Submitted by Dave on Mon, 18/07/2016 - 09:03

Here is my first attempt at a transforming model, I found it useful to give the centre a texture to conceptualise what was "spinning". I have not yet worked out how to roll up and tilt right at the same time (moving both axis').

Here is my 3D model...

Here is my code...

CS RESET
ST
TRANSFORM
SETPARENT "obj_0
SETMAT 0 12 
SETSCALE .5 .5 .5 
BALL
SETSCALE 1 1 1
SETMAT 0 21
CIRCLE
RU 90 FD 1
SETMAT 0 6
SETSCALE .1 .1 .1
BALL
BK 2
BALL
FD 1 
LT 90
FD 1
BALL
BK 2
BALL
SPIN "obj_0 "tr 4
SPIN "obj_2 "right 20
HT
SHOWALL
; end

Many Thanks,

Dave

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Add texture

Submitted by Andy on Mon, 18/07/2016 - 11:34.

Yes, applly image texture to the centre ball will show how it spins.

To do so in programming:

BALL
SELECT OBJECT  ; the keywork object will always be the latest object created
SETIT 8 8  ; similar to setmat with two indexes
DESELECT

Bravo

Submitted by Andy on Mon, 18/07/2016 - 11:26.

Good job on the animation. :-) A suggestion is that you use two parents so the other two electrons won't spin out of orbit.

CS RESET
ST  ; show turtle
TRANSFORM
SETPARENT "obj_0
TRANSFORM
SETPARENT "obj_1
 
SETMAT 0 12 
SETSCALE .5 .5 .5 
BALL  ; this is the nucleus  
SETSCALE 1 1 1
SETMAT 0 21
CIRCLE
RU 90
SETMAT 0 6
SETSCALE .1 .1 .1
 
; use a loop to get the 4 electrons
REPEAT 4 [
  FD 1 
  BALL
  BK 1
  RT 90
] 
; Now the animation
SPIN "obj_0 "tr 4 
SPIN "obj_1 "right 20
 
HT  ; hide turtle
 
SHOWALL

3D animation is very tricky. If one parent (TRANSFORM), two electrons (top and bottom I guess) will stay in orbit, but the left and right electrons will be out or orbit. Can you figure out why? It has something to do with the spin tiltright.

Animation

Submitted by Dave on Sun, 24/07/2016 - 08:19.

Yes, after I ran into this problem I noticed straight away in your lesson to State High where I had gone wrong. Is the reason for this that each parent works on a single axis? whereas if I add two parents I can manipulate the image around two axis' simultaniously?.. I will have another play.

it is, the spin

Submitted by Andy on Sun, 24/07/2016 - 10:57.

In short, yes. SPIN command works on one axis only, and each TRANSFORM can only have one SPIN. Therefore, multiple TRANSFORMs (as parents) can allow manipulations on multiple axes.

TRANSFORM is a convenient way to animate. It is certainly possible to animate in any abitrary directions using ORIENT command (see in the Animator window) but ORIENT command needs to collect and specify all directions you wish to rotate. Using TRANSFORM as parent is like adding another SPIN on top of a local system. Imaging that we have a solar system, and the whole solar system is also spinning around the centre of the galaxy....

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