How to make More accurate?

is my code

OgreNewt::ConvexCollisionPtr col=OgreNewt::ConvexCollisionPtr(new OgreNewt::CollisionPrimitives::ConvexHull(mWorld,mEntity,0));

that is my Effect Picture


How to make More accurate?

sorry for my poor english
thanks for your help

Make multiple (convex) collision shapes from some parts of your model. Update this shapes when pose or position change. What you are doing is create convex hull from mesh. It's convex and don't change when model pose changes that's why it looks like this.

Make multiple (convex) collision shapes from some parts of your model.?

how can i to do that?

You will have to dvide your body into convex shapes in a 3d modeler or use bones to get vertices that belong to this bone and make convex collision body out of it.

You seem to have some stray vertices in your model like the one above model head.