Hi,
I use matter-js, which uses poly-decomp for decomposition of concave shapes. And from what I can tell they use it correctly.
As I understand decomposition should work if isSimple() returns true, correct me if I'm wrong.
my stringified dataset:
[[0,-79.44508550870114],[10,-99.0834989573238],[20,-128.29964750979318],[30,-185.09029800617753],[40,-134.0195021932894],[50,-139.5227157326003],[60,-215.58025321809043],[70,-6.122609059449391],[80,-236.07719042816427],[90,-226.24259910699942],[100,-238.8041580583293],[110,-140.12907455932222],[120,-52.898053692856664],[130,-116.1611158499016],[140,-182.81279630844563],[150,-57.05993977865975],[160,-93.0145040380496],[170,-234.66429450441535],[180,-36.42968890750706],[190,-163.89528934984702],[200,0],[0,0]]
and result as returned by poly-decomp:
[[[40,-134.0195021932894],[10,-99.0834989573238],[20,-128.29964750979318]],[[20,-128.29964750979318],[30,-185.09029800617753],[40,-134.0195021932894]],[[50,-139.5227157326003],[60,-215.58025321809043],[70,-6.122609059449391]],[[118.85126572145955,0],[0,0],[0,-79.44508550870114],[10,-99.0834989573238],[40,-134.0195021932894],[50,-139.5227157326003],[110,-140.12907455932222],[120,-52.898053692856664]],[[130,-116.1611158499016],[140,-182.81279630844563],[150,-57.05993977865975]],[[160,-93.0145040380496],[170,-234.66429450441535],[180,-36.42968890750706]],[[180,-36.42968890750706],[190,-163.89528934984702],[200,0],[185.00906723012366,0]],[[185.00906723012366,0],[118.85126572145955,0],[120,-52.898053692856664],[130,-116.1611158499016],[160,-93.0145040380496],[180,-36.42968890750706]]]
The error is apparent as the vector [100, -238.8041580583293] does not show up in the result...
I also added images that showcase how it should, and how it actually does, look like. (for this I simply cut the shape into stripes)
Hi,
I use matter-js, which uses poly-decomp for decomposition of concave shapes. And from what I can tell they use it correctly.
As I understand decomposition should work if isSimple() returns true, correct me if I'm wrong.
my stringified dataset:
[[0,-79.44508550870114],[10,-99.0834989573238],[20,-128.29964750979318],[30,-185.09029800617753],[40,-134.0195021932894],[50,-139.5227157326003],[60,-215.58025321809043],[70,-6.122609059449391],[80,-236.07719042816427],[90,-226.24259910699942],[100,-238.8041580583293],[110,-140.12907455932222],[120,-52.898053692856664],[130,-116.1611158499016],[140,-182.81279630844563],[150,-57.05993977865975],[160,-93.0145040380496],[170,-234.66429450441535],[180,-36.42968890750706],[190,-163.89528934984702],[200,0],[0,0]]
and result as returned by poly-decomp:
[[[40,-134.0195021932894],[10,-99.0834989573238],[20,-128.29964750979318]],[[20,-128.29964750979318],[30,-185.09029800617753],[40,-134.0195021932894]],[[50,-139.5227157326003],[60,-215.58025321809043],[70,-6.122609059449391]],[[118.85126572145955,0],[0,0],[0,-79.44508550870114],[10,-99.0834989573238],[40,-134.0195021932894],[50,-139.5227157326003],[110,-140.12907455932222],[120,-52.898053692856664]],[[130,-116.1611158499016],[140,-182.81279630844563],[150,-57.05993977865975]],[[160,-93.0145040380496],[170,-234.66429450441535],[180,-36.42968890750706]],[[180,-36.42968890750706],[190,-163.89528934984702],[200,0],[185.00906723012366,0]],[[185.00906723012366,0],[118.85126572145955,0],[120,-52.898053692856664],[130,-116.1611158499016],[160,-93.0145040380496],[180,-36.42968890750706]]]
The error is apparent as the vector [100, -238.8041580583293] does not show up in the result...
I also added images that showcase how it should, and how it actually does, look like. (for this I simply cut the shape into stripes)