Auditing a glTF Material in Three.js: Why a Matte Preset Left Highlights

A developer working on the WrapPrism project noticed that an imported car-body model kept sharp highlights on its hood and fender after switching to a preset labeled Matte. To find out why, they audited the material, comparing Gloss, Satin, and Matte finishes across two colors in the same browser view on October 27, 2026. The Matte preset changed both roughness and metalness, so the comparison could not isolate roughness on its own. The presets were application-level values, not physically calibrated definitions of gloss or matte, and the screenshots and model file are not publicly distributed. The authors present the work as a repeatability-based comparison rather than a pixel-identical reproduction across devices.