how to implement live2d clip?

vantaci

hey there,
how to implement a live2d object clip in cocos2d-x? For example, if i just want a single part of a live2d character(Maybe head).

i tried using glscissor like this:

void LAppLive2DManager::onUpdate()
{
live2d::DrawProfileCocos2D::preDraw();

{
glEnable(GL_SCISSOR_TEST); <<======================
glScissor(300, 400, 100, 100); <<======================
}

L2DMatrix44 projection;
Director* director=Director::getInstance();
Size window=director->getWinSize();
projection.scale(1, window.width/window.height);

if (viewMatrix!=NULL)
{
projection.append(viewMatrix);
}

for (int i=0; iupdate();
model->draw(projection);
}

glDisable(GL_SCISSOR_TEST); <<======================

live2d::DrawProfileCocos2D::postDraw() ;
}

however,it didn't work. Did i use it in a wrong way, or should i try other solutions?

thanks