What is the best way to reduce a flat colors 3D model?

To reduce a flat-color 3D model effectively, use polygon reduction tools that preserve hard edges, UV boundaries, and material assignments—this maintains color consistency, critical for flat-color designs. Flat-color designs depend on clear face or material grouping, so avoid tools that merge faces or distort UVs (which cause color misalignment). Tools like Blender’s Decimate modifier (Collapse mode) or MeshLab work well here. For beginners, start with Blender’s Decimate modifier: set to “Collapse,” adjust the ratio slowly, and preview often to balance file size with color integrity.