REM-Client f3b0dec7: cube map skybox in RemGfx, captured environment, image based lighting

BUILD_INFO.txt

@@ -1,6 +1,6 @@
 REM-Client test build (64-bit)
-date:    2026-11-09 11:55
+date:    2026-11-09 13:03
-commit:  b3ea03fb (main)
+commit:  f3b0dec7 (main)
-subject: Jump portals: beams opening the gates, coloured jump holes
+subject: Skybox as a RemGfx cube map, captured environment and image based lighting
 tree:    clean
 build:   OK

EXE/remgfx.ini

@@ -77,6 +77,23 @@ Contrast = 1.15
 ; shadows) with a world radius AoRadius (metres) and strength AoIntensity.
 Reflections = 1
 ReflectionStrength = 1.0
+; Cube map skyboxes: a system with six faces in MATERIALS\Skybox\<system>\ (px nx py ny pz nz .dds) shows
+; them instead of its star sphere. Skybox = 1: drawn by the renderer as one cube map (one lookup per pixel,
+; seamless, mipmapped); 0: drawn by the game as six textured quads. SkyboxBrightness scales it.
+Skybox = 1
+SkyboxBrightness = 1.0
+; Image based lighting from the system's own sky (needs Reflections = 1): on entering a system its
+; background -- the skybox, or else the star sphere drawn once into the six faces of a cube (IblCaptureSize
+; pixels each) -- is filtered into a diffuse and a specular environment. Ships, stations and solars then
+; take their ambient light from the sky around them and metal mirrors the real sky (sharp to blurred by
+; roughness). Ibl = 0: the grey NebulaCubeMap above, tinted with the system's ambient light.
+; IblDiffuse: ambient strength (1 = the system's ambient brightness); IblSkyTint: how much the sky shapes
+; and colours it (0 = flat system ambient, 1 = the sky alone); IblSpecular: brightness of the mirrored sky.
+Ibl = 1
+IblCaptureSize = 256
+IblDiffuse = 1.0
+IblSkyTint = 0.75
+IblSpecular = 1.0
 Ao = 1
 AoRadius = 6.0
 AoIntensity = 1.0