To cut triangles from 3D models for posters, export a 2D render (e.g., SVG/PNG) of the model using 3D software, then use a graphic design tool to isolate and refine triangular sections.
3D tools like Blender or SketchUp let you angle the model to highlight triangles, then render a flat image—this captures the triangular structure clearly.
Graphic apps (Photoshop, Illustrator) or free options like Canva help crop, resize, or simplify triangles for a clean poster layout.
Beginners can start with basic model views to avoid complex adjustments, using Blender’s free "Render Image" feature and Canva’s free plan for easy edits.