Hi Jerry,
I am not sure what you are trying to archive, but if you want to find the
bounding box for a 3D object defined by 3 points, you have to evaluate the
min/max for each component separately. Also you have to compare each point
against the current min/max you already calculated:
something like this:
_Mins = new Array(9999,9999,9999);
_Maxs = new Array{-9999,-9999,-9999);
for(var point=0; point<Points.length; point ++){
for(var component=0 ; component<3; component ++){
if( _Mins[component] > Points[point][component]){
_Mins[component] = Points[point][component];
}
if( _Maxs[component] < Points[point][component]){
_Maxs[component] = Points[point][component];
}
}
}
Please note: This is untested code, I just typed it in the email. (missing all
the "main-function"-wrapping)
The result is a _Mins and _Maxs array having 3 components each, containing the
min and max values for x , y and z of all points. Makes six numbers total. Is
this what you need?
best,
Achim Breidenbach
Boinx Software
On 11.05.2011, at 11:07, Jerry Smith wrote:
> Here's another revision, still the same problem. Not yet getting something
> crucial:
>
> _Mins = []
> _Maxs = []
>
> function (__structure min, __structure max) main (__structure Points)
> {
> var result = new Object()
> if (Points != null) {
>
> for (var i=0; i < Points.length; ++i) {
> _Mins = [Math.min(Points[0][0], Points[i][0]),
> Math.min(Points[0][1], Points[i][1])];
> }
>
> for (var j=0; j < Points.length; ++j) {
> _Maxs = [Math.max(Points[0][0], Points[j][0]),
> Math.max(Points[0][1], Points[j][1])];
> }
> }
> result.min = _Mins;
> result.max = _Maxs;
> return result
>
> }
>
>
>
>
> On 5/10/11 11:05 PM, "Achim Breidenbach" <[email protected]> wrote:
>
>> Hi Jerry,
>>
>> First question: The "m=0" line belongs outside the for-loop for sure,
>> otherwise m will always be 0 or 1 for the following lines, alway
>> overwriting previouse stored _Mins and _Maxs.
>>
>> Also "m++" means increase m after evaluating the code line. In the
>> following line m is 1 and will be increase again. The result is that
>> in the _Mins array only the even idexes get set, and in the _Maxs the
>> odd indexes. I guess you want to change the first "m++" to just "m",
>> but then "m" goes with "i" which means that "m" is obsolete and can be
>> replaced by i.
>>
>> Best,
>>
>> Achim Breidenbach
>> Boinx Software
>>
>> On 11.05.2011, at 02:11, Jerry Smith <[email protected]> wrote:
>>
>>> I realize this is double posting from this kineme forum thread:
>>> http://kineme.net/forum/Discussion/General/JavascriptMinMax
>>>
>>> Sorry. In the meantime I reduced the comp to the essential parts. I am
>>> trying to set up an approach to getting a bounding box (and eventually a
>>> cube) for polygons with arbitrary # of points. Comp uses Kineme Structure
>>> Tools and GL Tools. I have 3 questions in order of importance:
>>>
>>> 1. Re: getting the min/max from an array. This js (as well as the attempt
>>> using the iterator in the comp) only grabs the first and last points in the
>>> structure of 4 points. What am I doing wrong here:
>>>
>>> [javascript]
>>> _Mins = []
>>> _Maxs = []
>>>
>>> function (__structure min, __structure max) main (__structure Points)
>>> {
>>> var result = new Object()
>>>
>>> if (Points != null) {
>>> for (var i=0; i < Points.length; ++i) {
>>> m = 0
>>>
>>> _Mins[m++] = [Math.min(Points[0][0], Points[i][0]),
>>> Math.min(Points[0][1], Points[i][1])];
>>> _Maxs[m++] = [Math.max(Points[0][0], Points[i][0]),
>>> Math.max(Points[0][1], Points[i][1])];
>>>
>>> }
>>> }
>>> result.min = _Mins;
>>> result.max = _Maxs;
>>> return result
>>>
>>> }
>>> [/javascript]
>>>
>>> 2. How can I send points in order to keep mesh corners from folding over?
>>>
>>> 3. In the number stats display, how can I truncate to decimal places and
>>> avoid the jumps caused by floating point error?
>>>
>>> <StructMinMax2.qtz>
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>
>
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