diff options
Diffstat (limited to 'assets/shaders/Geodesic.slang')
| -rw-r--r-- | assets/shaders/Geodesic.slang | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/assets/shaders/Geodesic.slang b/assets/shaders/Geodesic.slang index 9120ac0..7acbd78 100644 --- a/assets/shaders/Geodesic.slang +++ b/assets/shaders/Geodesic.slang @@ -28,8 +28,9 @@ struct Disk float disk_r1; // inner edge (clamped to the ISCO, 3 r_s, below) float disk_r2; // outer edge float disk_num; // turbulence strength (0 = smooth physical disk) - float thickness; // unused by the thin-disk model; kept for UBO layout - float disk_density; // overall disk brightness / exposure + float thickness; // slab half-height (anti-aliases the edge-on disk) + float disk_density; // disk brightness / exposure + float temperature; // Kelvin at the flux peak (disk colour) }; ConstantBuffer<Disk> disk; @@ -73,8 +74,6 @@ static const float MAX_STEP_SIZE = 2e10; // Display mapping for the (relative) Novikov-Thorne flux -> visible colour. // The RADIAL PROFILE is physical; the absolute temperature scale is a display // choice (a real Sgr A* disk is far cooler / redder than this). -static const float T_PEAK = 4800.0; // Kelvin at the flux peak (display scale) -static const float DISK_EXPOSURE = 0.9; // overall brightness of the disk struct Hit { @@ -162,7 +161,7 @@ float3 DiskEmission(float3 P, float3 rayDir) float xr = rc / rin; float flux = max((1.0 - sqrt(1.0 / xr)) / (xr * xr * xr), 0.0); float Tn = pow(flux / FLUX_PEAK, 0.25); // normalised temperature, peak ~ 1 - float Temit = T_PEAK * Tn; + float Temit = disk.temperature * Tn; // Keplerian orbit (prograde about +Y). Locally-measured orbital speed for a // Schwarzschild circular geodesic: v = sqrt( M / (r - 2M) ) = 0.5 c at ISCO. @@ -197,8 +196,7 @@ float3 DiskEmission(float3 P, float3 rayDir) bright *= max(turb, 0.0); } - float exposure = DISK_EXPOSURE * max(disk.disk_density, 0.0) * 10.0; - return colour * bright * exposure; + return colour * bright * max(disk.disk_density, 0.0); } struct Ray |