{"version":"material-roadmap-v38","status":"opt_in_not_default","backend":"paper-brush-v4","profile":"watercolor-study-v2","guide":"/sketch/skills/material-v4.md","implemented":["normalized conservative implicit water","two optical pigment populations through paper and finite brushes","cell integrated synthetic paper","separate sizing absorption fixation","water flux driven implicit pigment advection","rewet stain floor","fixed material step 0.1s"],"notImplemented":["measured paper or pigment calibration","spectral colour","3D fibres or bristles","complete Curtis shallow water","v4 GPU parity"],"sources":["https://grail.cs.washington.edu/projects/watercolor/paper_tiny.pdf","https://arxiv.org/abs/1909.09098"],"visualEvidence":"local controlled wash and cloud trials; numerical success is not artistic success","noviceTransfer":{"runs":1,"subject":"morning mist at a lake with a small tree","workflow":"baseline image review, targeted revision, v4 comparison, wait-only revision, reject v4, preserve/export v3","result":"comparison_completed; v3 retained; three UI readback repairs retested successfully","generalizedSuccessRate":null,"videoOffer":"omitted initially; explicit clarification and revised contract led to owner-facing offer; no generation"},"legacy":"paper-brush-v1/v2/v3 and watercolor-standard-v1 retained"}