# saint_bronze The body surface of the Slag Saint: cast bronze that carries its own corrosion, scorch and furnace light in one pass. The mesh's per-vertex colour is a control mask rather than a tint — red is verdigris, green is soot, blue is the polish that catches a rim light, and alpha is the seam the furnace bleeds through — so a single material can dress a whole limb and still read as bronze on the raised faces and green in the recesses. `heat` grades the figure per phase, `damage` blackens the plate and opens glowing cracks in it, and `grain` perturbs the shading normal along a value-noise gradient so a cast plate does not read as a clean primitive. Written as a `surface()` shader so the capture debug passes report the real albedo, roughness, metallic and emissive channels.