
1. Re: Closing an irregular polygon
Mylenium Mar 29, 2011 11:11 PM (in response to Darren Hardaway)1 person found this helpfuland so far my searches have not come across a method of closing a polygon without some angles.
Exactly! That "closing" part is not the issue, but how do you hope to determine a correct surface area? Different polygons with identical side lengths can have different surface areas depending on how they are shaped  basic 4th grade planar geometry. This is never gonna work, so you are looking for something that doesn't exist. Unless you have at least 2 known angles or 1 angle and the diagonal to constrain the shape, all your calculations will be ambiguous and the surface area will be meaningless.
Mylenium

2. Re: Closing an irregular polygon
bogiesan Mar 30, 2011 7:51 AM (in response to Mylenium)Why would a mathematician even consider a graphics package like After Effects for this task? Surely there are science or math or CAD applications that offer far more focused tools for this exercise. I know I can write research papers using Xcel but it's a lot more fun in Word.
bogiesan

3. Re: Closing an irregular polygon
Darren Hardaway Mar 30, 2011 8:12 AM (in response to Darren Hardaway)I figured as much. Well is it possible to get all of the cases either way? I am also aware this is not really the right program for this sort of work but like I said I have no access to or knowledge of any other possible program. In all honesty I'm not even sure if this is the right way to go about the problem I have proposed in the first place. However if this is the right method the polygons may produce several different cases but I am pretty sure the one with the best surface area should be one who's interior angles are all closest to 90 degrees. Producing every possible case and tossing out unlikelies is definitely not something I would want to attempt in After Effects either. What I do want is the polygon that produces the largest possible surface area, but it seems like a different route such as a kind of residual measurement is going to be best. What I am attempting to do is optimize four linear equations at the same time, optimization being the highest possible values while also being very close together. Constraints on the variables are currently limited and I figured its pretty similar to the maximization of a 4 sided polygon's surface area; seeing as a square has equal sides the maximized polygon would have to be very close to or be a square.
Does this help? Probably not. Thank you Mylenium.
Darren

4. Re: Closing an irregular polygon
bogiesan Mar 30, 2011 8:18 AM (in response to Darren Hardaway)If you have the chops to program the expressions in After Effects ad cascade the results into additional situational filtering you have the chops to approach any Javabased math application.
Stop by Rick Gerard's expression shop and visit the AE Enhancers site to ask these questions.
bogiesan

5. Re: Closing an irregular polygon
Mylenium Mar 30, 2011 8:32 AM (in response to Darren Hardaway)pretty sure the one with the best surface area should be one who's interior angles are all closest to 90 degrees.
Nope! Example: If 2 angles are 90 degrees and the two sides near one corner are equal, but the other side is longer, as a result the effective shape would be a square with an additional triangle at the top and the surface area be larger than the square alone. You could calculate it in this example, because you knew the angles and the length of 3 sides, but not in other cases. However, this example also contains the answer: The largest possible surface area of the polygon is defined by the largest possible surface area of its subelements, i.e. triangles. Still, without any constraints you can only find the optimum one by sheer luck or using a statistical method where you simply try out all possible combinations of angles and only retain the largest one after a series of iterations. That in itself is nothing you would do in AE for performance reasons, but it would probably be doable as a Flash applet or Java applet in a browser.
Mylenium