Farseer Physics: Ways to create a Body?

Question

I want to create something similar to this using farsser and Kinect:

https://vimeo.com/33500649

This is my implementation until now:

http://www.youtube.com/watch?v=GlIvJRhco4U

I have the outline vertices and the triangulation of the user. And following the Texture to Polygonmsample i used this line to create the shape, where farseerObject is a list of vertices of the triangles:

_compound = BodyFactory.CreateCompoundPolygon(World, farseerObject, 1f, BodyType.Dynamic);

But I have to update the body each frame (like 30 fps) and this is very slow. I get just 2 or 3 fps.

There's another (faster) way to create the Body from a list of triangles or the contour vertices?

How do you think they do this on Box2D?

Update:

After some testings i used EdgeShapes for the user contour (without triangulation) and i update the vertices for that edges in the fixtures every frame, now all is faster.

((EdgeShape)(farseerBody.FixtureList[i].Shape)).Vertex1 = new Vector2(farseerVertices[i].X, farseerVertices[i].Y);

But the collisions does not work!

My approach is incorrect?

Answer 1

Finally works!

I had the vertices of the contour as a sequence, so the solution was use the LoopShape to create the fixture of the body. I did not even know that Class =P

 LoopShape loopShape = new LoopShape(farseerVertices);
 //Delete the previous fixture
 farseerBody.DestroyFixture(previousFixture);
 //Create new fixture with the new contour
 farseerBody.CreateFixture(loopShape);

And that's all!