Set default material for Mesh

I am using cocos2d-x v3.17.x js. After converting the Maya exported model to .c3t I can see that some Mesh are using default material. However, these textures do not exist. How can I set them to use the cc.SHADER_POSITION_COLOR and set the color as I want?

@mr.kylin Can you help me with this?

Sorry, I haven’t used cocos2d-x.