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feat(renderer): a matte variant of a material for the parts of rails no wheel rolls on: it lights the same maps as weathered steel, with the weathering scaled per vertex by userdata, so a polished running surface fades into unused steel without a bright stripe; the cut faces of rails are drawn in it in an extra pass

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maj00r
2026-10-13 18:30:16 +02:00
parent c7f9796387
commit 7e1b2c553c
7 changed files with 133 additions and 0 deletions
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12
shaders/light_common.glsl
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@@ -9,6 +9,8 @@ uniform sampler2D headlightmap;
float glossiness = 1.0;
float metalic = 0.0;
in vec4 UserData;
#param (weathering, 2, 3, 1, zero)
// ---------------------------------------------------------------------
// Lighting balance tunables - tweak these to control overall scene
@@ -285,6 +287,16 @@ vec3 apply_lights(vec3 fragcolor, vec3 fragnormal, vec3 texturecolor, float refl
{
// Diffuse colour is applied once, to the albedo; the light terms below are not scaled by it again
texturecolor *= material_diffuse();
float weathered = (param[2].w > 0.0 ? clamp(param[2].w * UserData.x, 0.0, 1.0) : 0.0);
float polished = weathered * smoothstep(0.03, 0.12, dot(texturecolor, vec3(0.2126, 0.7152, 0.0722)));
float weatheredluma = min(dot(texturecolor, vec3(0.2126, 0.7152, 0.0722)), 0.05);
vec3 unused = texturecolor * (weatheredluma / max(dot(texturecolor, vec3(0.2126, 0.7152, 0.0722)), 1e-4));
unused = mix(unused, vec3(1.0, 0.82, 0.74) * (weatheredluma / 0.8525), 0.5);
texturecolor = mix(texturecolor, unused, smoothstep(0.0, 0.4, weathered));
specularity = mix(specularity, min(specularity, 0.03), smoothstep(0.0, 0.4, polished));
metalic = mix(metalic, 0.0, polished);
glossiness = mix(glossiness, min(glossiness, 0.06 * abs(param[1].w)), polished);
reflectivity = mix(reflectivity, min(reflectivity, 0.08 * param[1].z), smoothstep(0.0, 0.4, polished));
// Scale ambient before it gets tinted by the texture.
// Sun, headlights and emission are added afterwards so they are NOT
// attenuated by AMBIENT_SCALE - this only dims the indirect term.