live2D does not work well with Sprite3D

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  vantaci

  April 2015

  Forget to mention: i defined a new render shader for Sprite3D, code as below:
  
  const char* cc3D_PositionNormalTexOutline_vert = STRINGIFY(
  attribute vec4 a_position;
  attribute vec2 a_texCoord;
  attribute vec3 a_normal;
  varying vec2 TextureCoordOut;
  varying vec3 v_normal;
  
  void main(void)
  {
  vec4 ePosition = CC_MVMatrix * a_position;
  v_normal = CC_NormalMatrix * a_normal;
  
  TextureCoordOut = a_texCoord;
  TextureCoordOut.y = 1.0 - TextureCoordOut.y;
  gl_Position = CC_PMatrix * ePosition;
  }
  );
  const char* cc3D_ColorNormalTexOutline_frag = STRINGIFY(
  
  \n#ifdef GL_ES\n
  varying mediump vec2 TextureCoordOut;
  varying mediump vec3 v_normal;
  \n#else\n
  
  varying vec2 TextureCoordOut;
  varying vec3 v_normal;
  
  \n#endif\n
  uniform vec4 u_color;
  
  uniform float u_falloffValue;
  uniform float u_powValue;
  uniform vec4 u_innerColor;
  
  void main(void)
  {
  vec3 normal = normalize(v_normal); // vertex normal does not calculate right here
  
  float value = dot(normal,vec3(0.0,0.0,1.0));
  
  vec4 texcolor = texture2D(CC_Texture0, TextureCoordOut);
  
  vec4 finalcolor = texcolor*u_color;
  
  
  value = clamp(value * u_falloffValue,0.0,1.0);
  
  value = pow(value, u_powValue);
  
  float inverseValue = clamp(1.0-value,0.0,1.0);
  finalcolor = finalcolor*value + u_innerColor*inverseValue;
  finalcolor.a = value;
  
  gl_FragColor = finalcolor;
  }
  );
  

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  Imai(dev_staff)

  April 2015

  Hi Vantaci ,
  Could you please test this code?
  
  void LAppModel::draw()
  {
  if (live2DModel == NULL)return;
  
  live2DModel->draw(); //comment this
  glFrontFace(GL_CCW);//change Front Face
  }
  
  In live2DModel::draw function, we call glFrontFace(GL_CW).
  Unfortunately we forgot to restore this state in live2d::DrawProfileCocos2D::postDraw() .
  
  This bug will be fixed next live2d SDK version.
  

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  vantaci

  April 2015

  Hi Imai , thank you for the response.
  
  glFrontFace(GL_CCW) does work, both live2d and Sprite3D show up correctly.
  
  That's a great help.
  /////////////////////////////////////////////////////////////////
  Meanwhile, there's another problem:
  We got a crash days before when using Spine and live2D object at the same time, the Spine crash during rendering,
  then we add code like this:
  void L2DSprite::onDraw(const cocos2d::Mat4 &transform, uint32_t flags)
  {
  Director * director = Director::getInstance();
  MATRIX_STACK_TYPE type = MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW;
  
  director->pushMatrix(type);
  director->loadMatrix(type, transform);
  
  LAppLive2DManager* Live2DMgr=LAppLive2DManager::getInstance();
  Live2DMgr->onUpdate();
  
  //buff error
  glBindBuffer(GL_ARRAY_BUFFER, 0); //We have to set bound buffer to 0 here
  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);//We have to set bound buffer to 0 here
  
  director->popMatrix(type);
  }
  Finally, after buffer was rebound to 0, the crash gone.
  I think something is wrong with buffer binding.
  
  
  Thanks

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  taigacon

  April 2015

  I guess you should upgrade your cocos2d-x to 3.4 and try again.
  Cocos2d-x 3.4 has fixed a bug about VAO, that VAO should be bound to 0 before VBO does. Just add GL::bindVAO(0); before glBindBuffer(GL_ARRAY_BUFFER, 0); within all cocos2d-x source code.
  If you enabled VAO configuration, you should apply this patch of cocos2d-x and do the samething on your code.

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