Frontier models are getting better at building games with fun mechanics and increasing complexity, but immersive worlds depend on assets that are both visually appealing and structurally correct. Today’s models routinely produce an object that reads correctly at a glance and falls apart on inspection. Parts float or intersect, surfaces are missing, openings are sealed, text becomes malformed, and spatial relationships described in the prompt are lost. The Instaplay Three.js Asset Generation Benchmark measures these failure modes on model-generated Three.js artifacts using deterministic geometry and scene checks alongside multi-view visual evaluation. We expect models to improve by reasoning more precisely about object relationships, inspecting their work from multiple angles, and revising invalid geometry before it reaches a game.
Three.js Asset Generation Benchmark
A verifiable benchmark for structurally correct, visually convincing Three.js assets generated by frontier models.