code wiki / _hdl_build / nx_cornell_gate.nx
nx_cornell_gate.nx
buildroot/runtime/_hdl_build/nx_cornell_gate.nx
about
nx_cornell_gate.nx -- ★THE CORNELL BOX GI VERIFICATION (field-evidence rung 3). The field's standard light-transport
test, solved with Goral et al.'s own radiosity method. The verification is MEASURED and CAUSAL:
T1 DIRECT-ONLY control: white back wall has r-g == EXACTLY 0 (white light on neutral white -- no tint source).
T2 WITH BOUNCE: colour bleeding APPEARS -- back-wall column beside the RED wall turns r>g, beside the GREEN wall g>r.
(The tint can ONLY have come from interreflection: the walls are the only coloured thing in the scene.)
T3 SOFT SHADOW: floor beside the tall block (occluded from the light) is much darker than open floor.
T4 determinism. T5 the classic image -> knowledge/nx_cornell.png (direct-only | with interreflection).
license_tier: ORIGINAL expect_exit: 0
dependencies 4 imports · 0 importers
imports: nx_syscalls.nxnx_png.nxnx_trimesh.nxnx_cornell.nx
imported by: nobody (leaf or entry point)
call flow from main pre-order; caps 40 nodes / depth 6 declared; ↻ = already shown
structs
| none |
consts
| 18 | const BG: i64 = 10 + 10*256 + 14*65536 |
| 19 | const W: i64 = 400 |
| 20 | const H: i64 = 420 |
functions
| 14 | func hw(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(1,s,n); return 0 } |
| 15 | func pn(v: i64) -> i64 { let b: *u8=sys_mmap(32) as *u8; var x: i64=v; var ng: i64=0; if x<0{ng=1;x=0-x} var i: i64=31; if x==0{b[i]=48 as u8;i=i-1} while x>0{b[i]=(48+x%10) as u8;x=x/10;i=i-1} if ng==1{b[i]=45 as u8;i=i-1} sys_write(1,(b as i64+i+1) as *u8,31-i); return 0 } |
| 16 | func clearfb(fb: *i64, n: i64, c: i64) -> i64 { var i: i64=0; while i<n { fb[i]=c; i=i+1 } return 0 } called by 1: main |
| 23 | func col_rg(i: i64) -> i64 |
| 31 | func floor_near(x: i64, z: i64) -> i64 |
| 46 | func lum(i: i64) -> i64 { let b3: *i64 = sys_mmap(24) as *i64; cor_b(i, b3); return (b3[0]+b3[1]+b3[2])/3 } |
| 48 | func main() -> i64 |