Hi Achim,
Thanks a lot, I'll test later in the day. At a glance it looks like the
missing link I need. I'm working on a comp to mask, crop, write to file,
scan and reassemble fragments of images/movies (so I actually need the 2D
bounding box first).
Jerry
On 5/11/11 7:58 AM, "Achim Breidenbach" <ac...@boinx.com> wrote:
> 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" <ac...@boinx.com> 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 <je...@sonsmi.com> 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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