Welcome to the Maxon developers forum and its community, it is great to have you with us!

Getting Started

Before creating your next postings, we would recommend making yourself accustomed with our forum and support procedures. You did not do anything wrong, we point all new users to these rules. Therefor I moved your topic to the General Talk which is the place to make request to the community. While Cinema 4D SDK board is purely about development questions.

Forum Overview: Provides a broad overview of the fundamental structure and rules of this forum, such as the purpose of the different sub-forums or the fact that we will ban users who engage in hate speech or harassment. Support Procedures: Provides a more in detail overview of how we provide technical support for APIs here. This topic will tell you how to ask good questions and limits of our technical support. Forum Features: Provides an overview of the technical features of this forum, such as Markdown markup or file uploads.

It is strongly recommended to read the first two topics carefully, especially the section Support Procedures: Asking Questions.

About your First Question

There is no such plugins (at least that I'm aware) in Cinema 4D, however you may be able to find issue in your mesh via the Mesh Checking features available in the Mode of the Attribute Manager.

1d38a2e5-3304-415b-803b-bf6859b55c34-image.png

I let the community answers regarding your request in case a developer have done a plugins that may fit your needs.
Cheers,
Maxime.

Selection Order Flag for GetActiveMaterials?