solved
Answer:the fbx to obj,have some loss with texture,it is wrong in 3ds max,not jpct
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obj.checkForCollisionEllipsoid(sv,eclips,6);
where is the eclips's center?
A:the center of obj?
B;the center of obj.mesh.getboundingbox?
and more question how to set the eclipse's center?
A:obj.setCenter(new Simplevector(x,y,z));
the (x,y,z),are coordinate in world's space or object's space?