On 2/26/2016 1:15 PM, JorgeAE wrote:
> Alain <kua### [at] videotronca> wrote:
>> Le 16-02-25 07:58, Stephen a écrit :
>>> On 2/25/2016 12:17 PM, JorgeAE wrote:
>>>> Hi!
>>>> My name is Jorge. I started using POV-Ray a couple of days ago, so I
>>>> am actually
>>>> a not very experienced POV-Ray user
>>>>
>>>> I have a question regarding an animation which is supposed to
>>>> reproduce the
>>>> vibration of a metal plate, that was taken at six different points of the
>>>> plate. The measured values are available in ASCII format.
>>>>
>>>> So far, I know how to define a simple geometry (scene) and start an
>>>> animation
>>>> with the help of the "clock" command. However, my task is to design a
>>>> metal
>>>> plate which vibrates according to the vibration values taken at the 6
>>>> different
>>>> points of the plate mentioned before. For this reason, I am actually
>>>> supposed to
>>>> import the vibration data to my POV-Ray code and assign it to 6 points
>>>> in my
>>>> geometry.
>>>>
>>>> I don't know how this should be implemented and have not found any
>>>> similar
>>>> example in the web, so I it would be great if someone could give some
>>>> ideas or
>>>> tips on how to do it.
>>>>
>>>> Thank you very much!
>>>> Jorge
>>>>
>>>>
>>>>
>>>
>>> Hi Jorge and welcome.
>>>
>>> You could use triangles to build your metal plate.
>>> With only 6 data points you could do that manually. If you had more you
>>> could build a mesh.
>>>
>>> You could define the data points as an array and read the values from a
>>> file.
>>>
>>> Help sections.
>>> 3.3.1.10 Array
>>>
>>> 3.4.5.2.3 Mesh
>>> 3.4.5.2.6 Triangle
>>>
>>> 3.3.2.3 File I/O Directives
>>>
>>>
>>
>>
>> Once the triangles are defined, making them into a mesh is very easy.
>> Just add "mesh{" before your triangles and a "}" after. That's all there
>> is to do.
>>
>> If you plan of having multiple views of your plate in a single scene,
>> this is the way to go.
>> First define your plate as an object:
>> Use "#declare Plate = mesh{ Your_Triangles}
>>
>> Next, place your plate at various locations and orientations:
>> object{Plate rotate <-5,0,0> translate <0,10,0>}
>> object{Plate rotate <0,60,0> translate <17,-3,0>}
>> object{Plate rotate <90,0,60> translate <-17,-3,0>}
>>
>> This will gives you 3 different views of your plate.
>>
>>
>> Alain
>
> Hello Stephen and Alain,
>
> thank you very much for your answers, both of them were very helpfull!! I now
> created my plate and defined and array with six elements, in which each array's
> element is a data point (measurement point).
>
> Unfortunately I was still not able to solve the problem completely. I am not
> sure how the animation should be implemented:
> Since the ASCII files, I want to get the data from, contain the measurement data
> registered in seven columns (a sort of timestamp and the six measured vibration
> signals), I thought of using a linear spline curve (the plate vibrates only in
> the z-direction). I would then assign the values in each of the six columns to
> each data point in my mesh. In this way, the vibration values would describe the
> path of the spline curve. Could this actually work? How would the syntax look
> like?

I won't attempt to write any code as I use a modeller.
You might not be aware that you can use frame_number instead of the 
clock variable.
If the timestamps are are linearly spaced you can use one per frame. 
That might simplify things.



> By assigning a spline curve to each data point I will be trying to animate the
> movement of a point and not an object, is this actually possible?
>

Yes, that is right but it might be a good idea to experiment. Remember 
to create things at the origin then translate them to where you want 
them. You can lose object if you don't and rotate them.




-- 

Regards
     Stephen

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