public override void adjustVertexData(AsVertexData vertexData, int vertexID, int count)
 {
     base.adjustVertexData(vertexData, vertexID, count);
     float clipX = mRootClipping.x;
     float clipY = mRootClipping.y;
     float clipWidth = mRootClipping.width;
     float clipHeight = mRootClipping.height;
     int endIndex = vertexID + count;
     int i = vertexID;
     for (; i < endIndex; ++i)
     {
         vertexData.getTexCoords(i, sTexCoords);
         vertexData.setTexCoords(i, clipX + sTexCoords.x * clipWidth, clipY + sTexCoords.y * clipHeight);
     }
 }