[add]: unified interface

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