How do I become a blender developer?

Start at learning a scripting/programming language . I would start with a scripting language, more specifically python. Python is a very powerful scripting language used in many areas of VFX and 3D software. Blender uses it extensively, and so learning python is your best first step to becoming a blender developer.

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How is blender developed?

Blender uses the Python programming language for its scripting API . The Blender Python API is based on Python 3. It is integrated deeply, used for writing add-ons, generating user interface layouts, and import and export of many file formats. It covers all user-accessible data and functionality.

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