Vodium

Surface maps now follow the labPBR standard, so any labPBR resource pack works with Vodium out of the box. Verified against SPBR.

• Normal mapping. Both _s (material) and _n (normal) maps are stitched into atlases matching the vanilla block atlas texel for texel. The chunk vertex format carries no tangent, so the tangent basis is derived from screen-space derivatives of position and texture coordinate, which works on stairs and custom models rather than only on full cubes.
• labPBR channel layout: R smoothness, G dielectric F0 or metal index (the eight named metals plus albedo-as-F0), B porosity and subsurface scattering, A emission where 255 means none. A missing map still reads as matte, non-reflective and non-emissive.
• Metals actually look like metal. Diffuse light is suppressed on them and they reflect the sky, instead of being a flat square with a single white dot from the sun. Highlight intensity is normalised by sharpness, so polished iron catches the sun the way it should.
• New Vivid settings: metal reflection strength, normal map strength, green channel sign, and occlusion from the normal map.
• The bundled "Vodium Surface Maps" pack was rebuilt in labPBR and now ships normal maps for the iron, gold and diamond blocks.

Known limitation: the tangent basis comes from screen-space derivatives, which jump across sprite boundaries inside the atlas, so a single line of pixels along a face edge gets a wrong basis.