private boolean flag;

    @SubscribeEvent(priority=EventPriority.HIGHEST)
    public void renderEntityPre(RenderPlayerEvent.Pre e){
        EntityPlayer player=e.getEntityPlayer();

        Entity en=player.getRidingEntity();
        if(en instanceof EntitySquid){
            EntitySquid squid=(EntitySquid)en;
            flag=true;

            OpenGLM.pushMatrix();

            OpenGLM.translate(0, 3/16F, 0);//not sure why this is needed for fixing center of rotation (if you are using translate below)

            //PartialTicksUtil.calculate(prevPos, pos) is equal to prevPos+(pos-prevPos)*partialTicks to smooth out transformation
            //OpenGLM.rotateX,Y,Z https://github.com/LapisSea/Magiology/blob/1.9/src/main/java/com/magiology/util/statics/OpenGLM.java#L129-L146
            OpenGLM.rotateY(-PartialTicksUtil.calculate(squid.prevRenderYawOffset,squid.renderYawOffset));//-\
            OpenGLM.rotateX(-PartialTicksUtil.calculate(squid.prevSquidPitch,squid.squidPitch)+90);//--------===> match squid rotation
            OpenGLM.rotateZ(-PartialTicksUtil.calculate(squid.prevSquidYaw,squid.squidYaw));//---------------/

            //fix gap between riding entity and
            OpenGLM.translate(0, -3/16F, 0);



        }else flag=false;
    }

    @SubscribeEvent(priority=EventPriority.HIGHEST)
    public void renderPlayerPost(RenderPlayerEvent.Post e){
        if(flag){
            OpenGLM.popMatrix();
        }
    }