From 68029fcd39c5f750896dc7afb9f7955509bb1343 Mon Sep 17 00:00:00 2001
From: Untold Engine <harold.serrano@untoldengine.com>
Date: Tue, 14 Jul 2026 15:28:30 -0700
Subject: [PATCH] [Patch] fixed env rendering in full immersion mode

[Patch] Fixed ibl dynamic range

[Docs] Added documentation for xr immersion mode
---
 README.md                                     |   1 +
 .../Shaders/OutputTransformShader.metal       |   7 +-
 .../UntoldEngine/Shaders/preCompShader.metal  |   8 +
 .../Systems/RenderingSystem.swift             |   3 +-
 .../UntoldEngineKernels-ios.air               | Bin 155408 -> 155424 bytes
 .../UntoldEngineKernels-ios.metallib          | Bin 516553 -> 516633 bytes
 .../UntoldEngineKernels-tvos.air              | Bin 155376 -> 155408 bytes
 .../UntoldEngineKernels-tvos.metallib         | Bin 514313 -> 514393 bytes
 .../UntoldEngineKernels-tvossim.air           | Bin 155408 -> 155424 bytes
 .../UntoldEngineKernels-tvossim.metallib      | Bin 516841 -> 516921 bytes
 .../UntoldEngineKernels-xros.air              | Bin 155376 -> 155408 bytes
 .../UntoldEngineKernels-xros.metallib         | Bin 514329 -> 514409 bytes
 .../UntoldEngineKernels-xrossim.air           | Bin 155408 -> 155424 bytes
 .../UntoldEngineKernels-xrossim.metallib      | Bin 516857 -> 516937 bytes
 .../UntoldEngineKernels.metallib              | Bin 513545 -> 513641 bytes
 .../Utils/EngineSettingsAPI.swift             |  40 ++++
 Sources/UntoldEngine/Utils/FuncUtils.swift    |  17 ++
 docs/API/UsingXRImmersionMode.md              | 183 ++++++++++++++++++
 mkdocs.yml                                    |   1 +
 19 files changed, 258 insertions(+), 2 deletions(-)
 create mode 100644 docs/API/UsingXRImmersionMode.md

diff --git a/README.md b/README.md
index f3c13255..7f486278 100644
--- a/README.md
+++ b/README.md
@@ -184,6 +184,7 @@ Untold Engine is well-suited for:
 - [Geometry Streaming System](docs/API/UsingGeometryStreamingSystem.md)
 - [LOD-Batching-Streaming](docs/API/UsingLOD-Batching-Streaming.md)
 - [Spatial Input](docs/API/UsingSpatialInput.md)
+- [XR Immersion Modes](docs/API/UsingXRImmersionMode.md)
 - [Gaussian System](docs/API/UsingGaussianSystem.md)
 - [Spatial Debugger](docs/API/SpatialDebugger.md)
 - [Profiler](docs/API/UsingProfiler.md)
diff --git a/Sources/UntoldEngine/Shaders/OutputTransformShader.metal b/Sources/UntoldEngine/Shaders/OutputTransformShader.metal
index e8206243..c19b3216 100644
--- a/Sources/UntoldEngine/Shaders/OutputTransformShader.metal
+++ b/Sources/UntoldEngine/Shaders/OutputTransformShader.metal
@@ -51,6 +51,11 @@ fragment OutputTransformFragmentOut fragmentOutputTransformShader(
 
   OutputTransformFragmentOut out;
   out.color = c;
-  out.depth = depth;
+  // Reverse-Z: sky pixels carry the clear value 0.0 = infinite distance. The
+  // visionOS compositor reprojects using view distance (near/depth), so exactly
+  // 0.0 divides to infinity and those pixels are discarded (rendered black).
+  // Clamp to a finite far depth (~1km) that is visually indistinguishable from
+  // infinity but valid for the compositor's reprojection.
+  out.depth = max(depth, 1e-4);
   return out;
 }
diff --git a/Sources/UntoldEngine/Shaders/preCompShader.metal b/Sources/UntoldEngine/Shaders/preCompShader.metal
index 2f2e97d8..11d6f634 100644
--- a/Sources/UntoldEngine/Shaders/preCompShader.metal
+++ b/Sources/UntoldEngine/Shaders/preCompShader.metal
@@ -54,6 +54,14 @@ fragment float4 fragmentPreCompositeShader(VertexCompositeOutput vertexOut [[sta
     baseColor.rgb = gaussianColor.rgb + baseColor.rgb * (1.0 - gaussianColor.a);
     baseColor.a = gaussianColor.a + baseColor.a * (1.0 - gaussianColor.a);
 
+    // Non-passthrough modes (full immersion, macOS, AR) present an opaque layer:
+    // the environment already fills every background pixel, so alpha must be 1.0
+    // regardless of what upstream content (HDR alpha, material alpha, Gaussians)
+    // produced. Only mixed passthrough is allowed to punch through via alpha.
+    if (isPassthrough == false) {
+        baseColor.a = 1.0;
+    }
+
     // Sample gizmo
     float3 gizmoColor = gizmoTexture.sample(s, vertexOut.uvCoords).rgb;
     float gizmoLumen = getLuminance(gizmoColor);
diff --git a/Sources/UntoldEngine/Systems/RenderingSystem.swift b/Sources/UntoldEngine/Systems/RenderingSystem.swift
index 86677bd2..d920687e 100644
--- a/Sources/UntoldEngine/Systems/RenderingSystem.swift
+++ b/Sources/UntoldEngine/Systems/RenderingSystem.swift
@@ -1330,7 +1330,8 @@ public let outputTransformRenderPass: RenderPasses.RenderPassExecution = { comma
 
     renderPassDescriptor.colorAttachments[0].loadAction = .clear
     renderPassDescriptor.colorAttachments[0].storeAction = .store
-    renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(0.0, 0.0, 0.0, 0.0)
+    // Do not override clearColor here: the XR layer sets it per immersion mode
+    // (UntoldEngineXR.swift), and the fullscreen quad overwrites every pixel anyway.
 
     guard let renderEncoder = commandBuffer.makeRenderCommandEncoder(descriptor: renderPassDescriptor) else {
         handleError(.renderPassCreationFailed, "Output Transform Pass: encoder creation failed")
diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-ios.air b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-ios.air
index f6c491474f2ba7eee9285e4ece98a391f759b807..cf9f01590c5d218461abfc1cfe469bcdf2a53b4e 100644
GIT binary patch
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diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-ios.metallib b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-ios.metallib
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diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-tvos.air b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-tvos.air
index 8ccfa38dc7bad928c65bf173019a926a95c6a0eb..7448af4ff4301ed1732fd2057f15ecbcefa1853a 100644
GIT binary patch
delta 1346
zcmX|A3rv#-5bpi_v<0dBsKNi$_6Oo@HnJ7Md_@PyP^K>V-4@4uEI-P&B9C<Hw$8cr
ziU@Ur)<*;%V2wK1z*uFIItR1@vr`!D&{;td)Fl|h!|1db3M-oJlFNO$yL@-K$4FzC
zttm{^>zY1E7L;j09oemlgZZZu>NY}teecHbT192hJC#f;AJ)LlY2q<=asQ$aPGv~)
zQ+|UZ%jvV1_i2GOTT?@(#3<#td%4QK^s?hReZoOX7AIF_6bW=)M?oG*FN<u`C#KRR
z`Wuv!pxYCbsrt2Ed{bHI?hY*aqSP{DP3OB)kA;EWL&g6gwD?3Fc{|xdz1c0K*$wsN
zg_KZQX$dWTDc)tc5F#>0WsA!4D!Mndri6|qn2V(f*pM3NOvrZUM<kNnv?N-S<&y%D
ziScSCB2oDvQyP<0fZ0^hINw5(%?TdL2CNhnOi~1s$WLU7b;>1b$ryBm1!*YIv?q`S
zHbs}pB9+leLR6vTm?caJ&k@5-DT*&C#iz#UFS>Q6s!JuBAEOGTer=y@Ch#`h^X?X)
z+t?~93eC%AlXjs!fj8;HgLJWZ6crK?9P6qnv8GPM&OWD4=JrWTV?&1-YJ}nEvcfzz
z@2wlci>Tix>-RORj)97QRG+=rMm!a?Gs=M{W}5YjjCTh88?v)VDM_kJjlNkW5BXrz
zS8PPKZ!kws=hj?Zncuwf<kiQu6X1058_{c?-e2cyYn}jHu5mQ;$FJRk>wJ$x8+N7l
zO#hWNnXca3S@M46&~uPdDi^C58S&98f@_5<SoVQlCZmHkcCp8{T;5uKgeS7Zj=a^x
ztOf6M)wCKG%7XKkC#^LG(v*eU%#QTU<nKaS-+NmlV7YI<6fv8e1M>O^3nfKuAGf;u
zBV&}&WA5nTEHO@Al3XNY1{AA2<)WIP(=Bcx&4KQCi(UlzLWDT^<cWK7m6`1Br0Dgc
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zwqp-uo}JI&$NhW3^f;M8L)AX0h<=;F^>_Dy^Xz&C^P2X9KY9y;1y{-;Fsqb7<DV5k
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z9PWg{W(d%-NFHtQ%ndXn&f{?pbhknV<IUl*9O^ECl@aQAJOGa_K@DRzI(a+<J3GL`
zP~ALMf~^w<7#FL?Bhc;xB|D;4<5B3o20GU3RO2zQ_do{gy`{zzP}K_tRvc1eHPqb#
zD=Utx@q1|MgBsR5S%bCU?*|X7kJsQyxPBW3So>=lJOyocK*`ycXz(<cuiOP4=P1))
zJ(LVV1}8q%;7{;m7z~_Isl^5ueE?QYKUa(A;OB=>!wJi@cpkR?4Ia*xqs2z>J%Itv
zZq{NmlsyF{pK@7?Zm53-I$k!c#TGa>4jH_DOp9&cEg}qj%1Rwxgtl#jmG>@Oqr>08
zTTImOu6!L{hI1u^hacIc!w#s}P7LslgF5VlGv5+Q^~iZ0`rxk}giejkI_!cwWkiNr
PYEZ-w_ZCb%?*H;HlJ)<5

delta 1326
zcmX|94NOx95bnK}XVq2<ICy_;pCL2NLgE9Bh?`PCel{_w%N9C~SuM;|g{@PvFr(`M
zm7n<sYAoOnV`^kWvR0gB2tpO1Qy6qgL_vHybQm*0H(fKateDM9zTB6~UGDOISAKEk
zMC(lDaC_uzNigOGF;t<9f;d;qnQdTc9Nspoe#Y@&HC&eJ7}vlZhclcY9q-3Ngu|)^
zxnn{Lvuu_m$sTGkA6jT~E@{4}tQpC;78ZVDCJ5#}Tq!T~+@2sa?GW<e>P6F4JyRkK
zsoDvuJ64|fx&^x&hamNnHF>WFy{g4Gc<EE4PIf=RtI8PSlbzN^*(H4lB?t2LuF(o|
z4U1rlBtLro-<a`EspsC@`SOSW%vl;{I!SVutjXeRlfcE~71}c5WEQ?VR<Tm(vZ9CS
z4x2X;Y@m|*$;(P29zA&-4?_Ym#bP^DC#nM56j>^J7oV&rb1{VvP#I!Ev1$O$7K8<Y
zckKshph#hMl3TL{ugU4*x?@@rU78{VaD6bRz@KHnDLz@4u|w!m@wLJ#gW>}$U=@Tb
zQLhLJI*oN<QTe@yy<(G3;_;bQnM1~D)dbDOGyF0p=iO#;xs+H@l$9p6r%Bz$`B3?f
z^0QZ7BuA@)Im+?*A_#Y=IAUI|J|b0;D(z&leSd5c%2V8@J^F|{$H^jB@!E#|=k@(-
zbK9l~yJa-XccpDb#QMp{)5Jx(_ooa-4y}mD{n+}#cy8y0GX*7?$HwyW`ycI_Ch`u8
z<UtkihVulG6QYnj5hN1I;aLdLjw>9IVB4Exy!2*#=;f0g!6#6}$~qUBt^Q<r;Vzpq
zWV`GaK3Oyb6-lf(Y*NI@;(%;a6sSz0WmEsV<cS#DV2C11670OuKVw}-8oz-rOCZDi
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z3t_w-ER^t)!4jA}3#HV=Q5MU<+X8h|-z^q*gR>R9l<=6veK6Jreo8f$!*U3CfTB&y
zI6MG@9gt3on>chp!&NAyg)<yh!LzGSN87N8!y~Z22fQ?Yo5N#J(F>z=AEU+^=<$J^
zk!aLd3xhX7$B0d8JOQ<Xkj{vA)p!bOhQY#^#?*Kk8ty_VW13RqchDw69V5=sU_IQr
z2VO=Wt-%JkeIG^{=Ryts0G+>qoOQmZK^NHiM?lB6@6})<l#W3<Yns&HkKi8%3yX3s
zx?%DOl(PDGE&c=-{)9SK$k5^ius;JY`^_dTw!*J}!zk;tX|WCVO@f>=T+^Zl&b<U3
zryAGdWoVv)bWR`8;uY}O2@7XftHUnn+(ndfV$ymY{tUiiqK@m!)!{X0E+M>}q*8}H
tP*p~Za_!YR?1jd!3AtL*qC+1%+)e1z<!w5=4kLSsbhXvZ&L<u%{};Ov{^kGx

diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-tvos.metallib b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-tvos.metallib
index 3d3c579343eddd9e3d42c4a0154988403c9da8e5..0b3ed6a112aaabfe1e9e23add22123ca3126a179 100644
GIT binary patch
delta 1591
zcmXw(3rtg27{|}Oy}jp_wr~p+FHq!`f--Ef%S((-`v7af7b;}pOm=xFIu)zvBu;Eg
zTYQ15qPys#;i1mg6dydMn`=w81W`Lc@qq@XTed|PG=`Cl=x%X4$?tsM_dnk`Io~<S
zx9ei;gNw1U`FZp72ta`d09zCgf`WZA4a(GCSlkguV-qqo-z=OuXI;?q4^n>_u)BJ*
z5?+REjvGBYvhoP=ZN;S|RhMk?1!b7wM&zZK7H{=;j?1@tUOx@rs!iN?^=ORS_ybn4
zX@1s{Wds<qMW*kFOh<T79zlC#I@UH1$!zyqF%v=#2S-;|Sm2iXq^q-9Iq?aXYr`VU
zR9Y5M<xYo3hO+&~5=)uGBv9c}Sru!#>o!=BgnUUIZa>8glKlwPlS1g2B0s4l@Cg$)
z`Kaack&o5}cGx7kCDIhd9fzKNYm->Zr72i<`dnI)N9tLmStMo-4}&~BNs@sz0=!RV
zlaKnSszSU=_|&ZNwFplzU8IS%=#+0M^^m5kWm_rJMO%=l8f99UrG&J<QwS*R9G_%&
zN3pV<8XS&>q+lg}yqL&|VNJXs8oiTDA`^R(u`(y@lUmu@_jMf?H#+g-PPnB3ZXn^g
z_jg4UL++jKMRt1WsBh6Tu`b$~c#<#h4N6JoNH)`>zD=2AkVnyJh0V-kGSP!0$p8d?
z4}20D*8rO)27jUbvv6*l@Qt>=(;8x&wKjW@9@i_iBgl?cJH{jA!P{Hy(62*#LhCYg
zap)wBoACnQ%RT7BWn7LAY6_xKC7s$k3S^^Q=`kLT%c&px6s<2+HkqST0GCZF+)Gmi
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z2OAM?&re7=cUA-S?XNVj9^uyAgbK1>%U8k=Ox}`t`ZRlrJ9HDqu262Z05YJCuO+cY
zhj>7Ux%h}4S8|ce(_5Tr^mqaikSsyeVu$w_g3x?G@BonKa_*kg7ED<91ns!efW}WH
z!VO9Qx=;jgq8_M0h<4dk{3Oab_QLpf`5mYgOt0QPo(-6)mUtDx=GM~cZo+f1hF13w
zo?hPECOofs<0m|!we&O(;fbrI2^UdCaz(Mi1!i9-+y-X%rgiG_BQ|B<m!N8|M<R+X
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zK!yun$G|ccu4f^sFm7Nnlf{>F#cd{Ws-%(@cQ7^@ngdgVX*C8+MJ`TPEKrC~G{9A^
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zG>G!JMM{K1^6PZA2)R|h%q`z9np;<%TqmBfW_*K-V^o+NlWo*Z;H-}juX!i`Y++cY
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z1GS(AuSxG}deq0#d&(Bttm-Q>rFgNlb=jGhAD?M`xIN%x-1GaI_LwWxS4IZ{PO-Es
zc2Aq)!;VVz!)rq$7gqh_St<xQKmGBm;nRIF0SDpicj4D4DBzU$;8e4}(S49z5}#h1
z@xEWEYAMBRqRL@jwU$iedqxW1GrU=kQmUiTslZlHttDDkdClITL_Mh<%d8U!qLQcW
zCNc3l|8KO3F?nMJaBPPve9rKfzY}g^xY(&Y`Ms{1eYH|#w+876hV{CXdQx(3mR9gG
zxW7RqxnYr93kf!aq3nN$K0_QpvNC!WTEC94vo;IGy}SqGkfU5nh%g2@&)p6YPL_7?
zj~d03#1q5eN3mGWIsg?S86VH#k#SErs7hGRyP-V)+jsmR;sLPoS{To`<rZ9rGq{<F
gkmmMX=ch&YVFvg204C#h)x$9EtyU=F2Crl6zbqga=>Px#

delta 1595
zcmXw(e@qi+7{}kYJ?@V7DhC$nPkN<_h7@-#r7+{9SBi>MQxGF=x)f0ZZn$Q18`;$M
z+FDWTbi#Ji$p+}6!yl_o!Ju(HC@IdWWH6M;wrbq6{o%$EXIMt&t|q?8=brEPx#!*=
z_vU>kF6j1N&}FWyb=n~ifph=@Dv$=!Kg=u>CAsr8m-DEMWAPoW9c0P3g~$Gyl%GGV
zs8<zDPL*9-Q|Q?etSV~yy1+1;IUjjadVS5H;f=M{%~vY34{Y13`mONq@wV%eV@ITG
z2UfSPbgX_E2ZsX6;yub@C?FCL_bH2!UMF1IH^L$wNP-M?sHFva_bz#LFr?2-a;^X}
z$D5BtTbc48rC7f`Df?MoeZ!9)Plxoz5mJw%oYqsJsBQb+vXwqcf)iiTljI~+B+NMT
zydZZ+rE(KDr(#>GAVBbM$;?!B$WHwiAYi-9j8s{xD593M`=9}pW%}Koy>^wOnM6NV
zY&xP1=Of-IRqkW?R=zq&)lJ76BuvHD&H+!kOX8+ArtN;Ovjl0P5@y0d$2~q?mB^Am
zL<_?D+Gcu^IwMjzm%Z*Lr{fC07;8kC>D#7u21o-0t2_ngu+t4R`&40fW5ei*>EmQ;
z8A?oNm|Ge37*7T6qwmo1Xf?WfAz?<EJy<F7;2;B2^VU4%HRZnGfRQn|n9Dpxs*xB-
z?H+g~%g~8+=gxZH_D6ly#<a(_u|YOt`I6Tw`+d2s@0C7=6ByWYDToN937~zKg4hTn
zYRPIVVe+7wQ-!cjZbcj`TXXb9(L;PN@S&xmo&M(=guZQeJhdzZM4n?n!_Z;MxP_HB
znew-)Lc4qFgZ1>_+Z%#fwk6!HKWwTVrHvP5$f>9~OdALBm^qCW(P7#N`X0owE@%ar
zPlZ+nn!y?9miTla%LR8v_yr<2?2(1^K<aAte2^;9fz@CJOp9%z1)Uk(tul<_Caz;L
z3E`-B;vb}oYZQG`*Rc*rj@pF93k}JRl=t+wySR=Un6CPMj}MTk?6Y?T?&ZHovrr@|
zIO<u(1<MOsKA|aq3KphPK8d2{K&%%+N-($p0JXjt$_{9SKGsp3K7o~`4Xdk0Bz>6?
zctQkMajV`(=J%OyV~fR$@^?M^0?_^lWx#Wb{gJr_e81TrF&c1bkw0P)oDdcZ&f-tv
z2E5ARr+@*s(;RXfuJmd$bW>1XIZ9w_){V@oFTx|Fv}o>*LrrRV<@%EH8tkW&ER>^%
z6^YISuQ&vCV~o<ah3epmeY!AIjxpMH7({DS32K5>onf`93aGxwYc8|etE|@Mp@w*3
z$T(szygN{spdYiw<N)E<%<#g)H}D1b-*<>EbF<_<A9^M!orz{#<t5vFXdAOiVYKPx
zj(Yj>F1ho*+@;U9TCZ3+%LQ{uf3?4Mc%E_Pt)X+yZ3`dWY;Lz@bJZ-&fpwgz4dx(q
zUD@loWB1W{X>xtecGx!cChrXjziBp7ZcOb>p1{Qf7^xK-fa3rdDH#Wdh<%H6`5PND
zZIs3m2Bb-48zMkuuibYR*zVxb#%Nu@*#D9Yz3|%;i(<I@-l&@%cb&fU!>&s&pMJD9
zB^qQqjs4Si;@$hbDN!<>d~&|=U;n*$_amudn{I#a3*q9ash&}7##f7e{3|7dd2lDb
z$37J$>o{f{vw9;P>__Xf<R)jyvzvpNeL$h9!2P?u?$^i#!U@h3ZjYej2Xjd6F9v~i
zAsZfPjCo_p1$NRnBi=6-t4yW)NJRQH`YYw3Ju#gao7rQKFPl2}JI>=%4Tton`k9dX
z_bur`R$|9#cPy&6lSILiQt{1M-}!Qgn44Jqr)=qLk-L{y`zC||tavNrly|T^$Z^Jb
zPzyh6JGWWQZD>LX*-2pmDuDt4EqCoaqT?RrV-{<c;9nI;#nhR?=K|mn^lX9W@p(QV
n<kSKI!2NjwU5Z--oh5GX;^0A4$$fkmv$j3_Du=r>glzpEL*O9r

diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-tvossim.air b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-tvossim.air
index 3fdef239a907f465439015c63bcbd9e247fe1194..b332ad163a71a1f570e7210e52d352cc7a00a0d0 100644
GIT binary patch
delta 1335
zcmXw13rv#-5bpi_v_A;)qXzz0A7Gr##<oI;ugqCQv~w(}+v1o`_oHm9P)X-&opbAz
zA*};keZ=Ae#aHZx#yZ@nQJ@8!^}(Q1Vgrapw}~+V?t#rzx~kbFm+#AWm%Gc|Ihy0@
zn&ZazdsD|rqBbe&)Q8)~r-SxX=GnD`sjp#ZZG63~HmXk~bDa?d+?b?4?5h}<AHyda
zvV(Nc;4bt8>YO7=;4Jo>m<ef=v}6Zg8_KIbqSj>Yp(T^0iMnzXbG)O}NHY0J=QUY5
zj7`%=dkE%A7L}t}(S`G<GG9-4{%2LzDa$(FnRqx3G=4hcS5;d;uO@HJ@ze8qRJnDA
z2C`Kf%TU(Xsuwc6hSnH8Yogi`t*@YOUAs1REYngU*1(#aaA#(bZ*@Wz*~5r>`yA=G
za8g!=oK480ma|o9*`-)Smq&y)hHT07(+=Ro<Y<yCnnZpgk*%Z_%0*LDh>Mn?L2)IM
zEOp4PCR)X6CR>$UCc3AoCd9AO$D6gX&uQ7Grqt)tdUE7dA|s5^W#WJ`B$*0=L;Y;J
z+2}L1>t$t@{OM$!>Pn_y*2G84r5kBFCLy}kr4!Q4ors+wPe9@eh;OFH4zu(KE6n6n
zvpC}$eX8ftU_deuXf&ol&A*B3pI;+`j^Y$&vOr9=Xy%)4-w&=SDkQ~h@pw+kjs4P?
z_t$;FB@_kjuhK9juI?qPTb7*Y9<6^$PF1{~vh4A_m4WjuPYGXQdQ@=wOW*yKfzjB;
zZ}WOnf9A~Q?z>xU@6`@HBibsdem^TAK6**zUF?mveV~y@m?)+%@H-Ys+npx`qEO#q
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zyKf*VjY=8wr3@G9CrfQ}%2fqn*;2n#loL#z)u+mJqc6j%(Svj@!er_Ar~l-wHrM&G
zQ;PM{Lap@Xg=bImf4d{rN>bGHVzSqmt0H-_UD9|$PP`13^@%KsVFxgO@GPzv*akCp
zy~twG>FrQ3`WlNL|Gopv({wBv4()`R#c#1#Jh&4)qs1&5TX#Wl@g^2agH8x<sAAF7
zQv=L`eJrlIz8hv-_@2deEqkC~K{JaR9_|J6ogj<mgSAj&>t%7{(F5SISst;tsp}vF
zQ}a3e>ef*R-znh`A#w~DW~7P3GWfF|42<}MLmNbX06U|q<#7vKJ_jyF(!*mVG&F&q
z5%2N16&|!en9(K)=m2XgFsx&ifZL(J9ds;RET9wIm%z@7#|7LC;Y;9REpCs1dtrMA
z_*s3AfVHr*69!ocFUJGW6#$CUDCBq$`mckUqtD3kFdXRx9Y+t!@hBYX2LtCAlH)OO
z-vm47h{*9fXbpjjqmvX^4}AmR=S&$2JOMXu!5|lURe>kr;%%V#&_V^C0!#2WQ1c_z
z3T%MNA<*%T#|r!r9u0$mcT-AigvbN1^QM_fJOj;tfr}UOm3S6x|A3$GTBXD$=za);
ze8{527TER}C;=}k(FcuBKrLv8mDmPN5zq;yF(sadYvqJNz$I$D02enCc7dL|T#Xmu
zS_R<}B&BM+3{5t|FKBAi*a7>t5QD<V9yNBtPu~!fTysv10k~U9sO8=kHC}}~)r3x7
L*T|$1f6x98nDzj>

delta 1332
zcmX|A3rtgI6u#$Du2l<^;_$xOUT2my3yTGfibg3^fz6uKWDA{Ut`=shf@_p4%;<V}
z2xYzinMECn!v`ChwL@2YK?^7y;;?Z{6wvyZsWU@{PV2<7Vm425a=x6LlmGv}@B8ao
zCRVgejK1lfI++N^lyE*-SsDE%%y%Z9-AJnYn}#+{YMgK&+>aBb+s70zXm`hvl--mB
z@phDhc#i;+tmZUgJ3UK?EiyW0pSc}%@Sg6HEUtbcs7+UJk+{fnW0=Y+fyfV+&K&P*
z*fRBi)J@XeN#fMkBiL!LhV)OD<-c0=N@x8lM2r|zqB|*Gsct~fIxJ11Hcccg2I}=$
zfl6u_hhUvbef0FdHN&9Ib3105I6ef?b7jWE6yIji`X?LJd}4l)RX0au7P^xpi`1PK
z^swEsDfhwybXqUf9z`ajC%@x<WGJ!J?}mM;($GdpwzQ;E&}yhWTr7lWoj;{i+6O-t
z%0l6L?ShC<vBcz{Hsq+iMu&&*PCS?DR1`~qzXH*P!E8N_30n1p&FW66a7evGFZloq
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B{ha^+

diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-tvossim.metallib b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-tvossim.metallib
index 547e84dca773c8f732e11c762d1e46ffd759005e..0d2bde0787fc12af907182477155d1bc60486d9a 100644
GIT binary patch
delta 1598
zcmXw33s4hR6n(qd?Awq8HvC*efDJ)QF*99$VzojN5QA2WnoRvoy9j=$icz#WQ#FL}
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zyvT%##CHQjQ^BaFQ3XZT6|3kdG&Ew-&}d1$5nCLBPXzV_#X9QviWY0jV3dK@zD}tW
ziIg#uw$p_4ZP!EA!dY6vMeucrCUE-j*N-SSHJs&8*PqoF^Us$_3T-|HisM^cY6C4h
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zBYscbh?*LS5RDKjH0&e7g*ih|B~c)MI)Xy@tOjbvtwE+g!vFd$5(?$n5Ep<js)aX~
n;S}K?4zhy26D{gHFj07Xi%<xXS{NW~HHsy|*$!g02qpXrDmft<

delta 1602
zcmXw(4@?tR9LL{lkGr#6<){@(|IjN{#z?2vT8cAHd!?WV8bFBXbSdHpIx*d3&N#Kb
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z@mn*Y4xVX#@UDj6@IFe&&xs3|Ba$tm;}3Tudj7(E%xY7J^*bW*7{64wXmX4BERk37
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diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-xros.air b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-xros.air
index 617629c6bf23787c36da91c911369919979429a8..c6fc7190a3d1fda08276c59618b0650c5ab58eff 100644
GIT binary patch
delta 1346
zcmX|A3rv#-5bpi_v<0dBsKNi$_6Oo@HnJ7Md_@PyP^K>V-4@4uEI-P&B9C<Hw$8cr
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PYEZ-w_ZCb%?*H;HlJ)<5

delta 1326
zcmX|94NOx95bnK}XVq2<ICy_;pCL2NLgE9Bh?`PCel{_w%N9C~SuM;|g{@PvFr(`M
zm7n<sYAoOnV`^kWvR0gB2tpO1Qy6qgL_vHybQm*0H(fKateDM9zTB6~UGDOISAKEk
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zryAGdWoVv)bWR`8;uY}O2@7XftHUnn+(ndfV$ymY{tUiiqK@m!)!{X0E+M>}q*8}H
tP*p~Za_!YR?1jd!3AtL*qC+1%+)e1z<!w5=4kLSsbhXvZ&L<u%{};Ov{^kGx

diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-xros.metallib b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-xros.metallib
index 73bd135faa156ec0aecaa7d984296735e4df1dd5..295d0551b5ac37c87b566974980fe87cef05d0ac 100644
GIT binary patch
delta 1591
zcmXw(3s4hB7{_-nm)i?T;KIuT0=W=G2Gi+*AdWARfDuF#6<Vc^9)ho`7)7gNrAbHt
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zy%a8e*ZYJqv8HyF2)!xS1kN4(>M7|WNAn%(rfd2#?&TVZ-Rff?S+3owHc+y&vvs29
zz5{g{*$s>Ax}UEx0OS5U^bsrtvNd6|vD!_fowHeJ{+~e<36JtlKXEub$KUr8Pm*5|
z9yL@TRv?@YK8maOeM3koQ3&x|0R{hpN1BP71=nBTfBQ}tWE22aK?@KVxBQ9@G=tBK
gK@4BtAxwG0D2ewO#ufabS`@(h>ctZNSqIMj3!#Y>D*ylh

delta 1594
zcmXw(4^R|U9LL|gTXxrDPxj!D`^)WdLdKl7cOC~d7PrS?5{JVfO=#*Ik%kt|O;RzM
z-tFCalAM2`wlWJ)(-7?>1tVv=g(E00r7-`L)#=b5rYvgAs3_WV#y9iX-}n35-@ZTl
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zGRK>TM4OqCAf;H@n2>%ecb)U22WLV0iBVFIqny@Ls;F-L!m^%zodk#8p|6qGpdxO@
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ztw1&-v|`Wzx}jU*(}DC#xFy2R6S-lRG^7Wql?|R<$r2q{2ByK3*e06Sp2mGsj8WXg
z$Cy+?IBK2vu36$LMeirr0Z5M7gtZF|$&8eAb-6pZ<L5A)>w1?Dkjd<wclqum-=(Ib
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zAh0}S!z1-EZ!9s-P8z4hEn>0CRJ4OcQfH#yQy$tA(}}U^?FRY7le;Hy9-pk+qd(fu
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zIAbo<!Z%w_tWk3f>rg^^L|A}IAYVYsoj-}_xPS97i#1*Fs|AuVd8F{U0C)tQA#gX|
q%?E^>S|9+pnM3Ge+#=|7aa#u`+l?x@x36H<*70|<xF3d)_5TA-+$P2V

diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-xrossim.air b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-xrossim.air
index 8e85815ac7e4a4030031c954db978cb26ca1fd62..3de2c98bb7c8c8b6551359bc33f19eb0bc351ba1 100644
GIT binary patch
delta 1335
zcmXw13rv#-5bpi_v_A;)qXzz0A7Gr##<oI;ugqCQv~w(}+v1o`_oHm9P)X-&opbAz
zA*};keZ=Ae#aHZx#yZ@nQJ@8!^}(Q1Vgrapw}~+V?t#rzx~kbFm+#AWm%Gc|Ihy0@
zn&ZazdsD|rqBbe&)Q8)~r-SxX=GnD`sjp#ZZG63~HmXk~bDa?d+?b?4?5h}<AHyda
zvV(Nc;4bt8>YO7=;4Jo>m<ef=v}6Zg8_KIbqSj>Yp(T^0iMnzXbG)O}NHY0J=QUY5
zj7`%=dkE%A7L}t}(S`G<GG9-4{%2LzDa$(FnRqx3G=4hcS5;d;uO@HJ@ze8qRJnDA
z2C`Kf%TU(Xsuwc6hSnH8Yogi`t*@YOUAs1REYngU*1(#aaA#(bZ*@Wz*~5r>`yA=G
za8g!=oK480ma|o9*`-)Smq&y)hHT07(+=Ro<Y<yCnnZpgk*%Z_%0*LDh>Mn?L2)IM
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zvpC}$eX8ftU_deuXf&ol&A*B3pI;+`j^Y$&vOr9=Xy%)4-w&=SDkQ~h@pw+kjs4P?
z_t$;FB@_kjuhK9juI?qPTb7*Y9<6^$PF1{~vh4A_m4WjuPYGXQdQ@=wOW*yKfzjB;
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zy~twG>FrQ3`WlNL|Gopv({wBv4()`R#c#1#Jh&4)qs1&5TX#Wl@g^2agH8x<sAAF7
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zQ}a3e>ef*R-znh`A#w~DW~7P3GWfF|42<}MLmNbX06U|q<#7vKJ_jyF(!*mVG&F&q
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z-vm47h{*9fXbpjjqmvX^4}AmR=S&$2JOMXu!5|lURe>kr;%%V#&_V^C0!#2WQ1c_z
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ze8{527TER}C;=}k(FcuBKrLv8mDmPN5zq;yF(sadYvqJNz$I$D02enCc7dL|T#Xmu
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L*T|$1f6x98nDzj>

delta 1332
zcmX|A3rtgI6u#$Du2l<^;_$xOUT2my3yTGfibg3^fz6uKWDA{Ut`=shf@_p4%;<V}
z2xYzinMECn!v`ChwL@2YK?^7y;;?Z{6wvyZsWU@{PV2<7Vm425a=x6LlmGv}@B8ao
zCRVgejK1lfI++N^lyE*-SsDE%%y%Z9-AJnYn}#+{YMgK&+>aBb+s70zXm`hvl--mB
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zfl6u_hhUvbef0FdHN&9Ib3105I6ef?b7jWE6yIji`X?LJd}4l)RX0au7P^xpi`1PK
z^swEsDfhwybXqUf9z`ajC%@x<WGJ!J?}mM;($GdpwzQ;E&}yhWTr7lWoj;{i+6O-t
z%0l6L?ShC<vBcz{Hsq+iMu&&*PCS?DR1`~qzXH*P!E8N_30n1p&FW66a7evGFZloq
zISJ`Z)kwm8j^_&5^nxD59)Gis@c4{NOp%Wm=`h15v%)+!_q{Xz1rg-J;_Qrwl8gwK
zc^cIG6ZP3EDYOaFaGh>1oC$GufhVWrY2wp~^oWaWj_=Pk>Wam#V;)WX-~p=GS-Sj0
z@6*QK<$0~+fLj;H_FZUQ82|C;!*SrGT)P(cPaRkopZAI7h2i9uRmTg<vTBD43VI*x
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zfM)9E@mK}7Iv|q~*79fvXBXHQ%W)p}!t*X@V65(D9{0oU%iv{<H+ZatuX`ZCNI5wk
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z3T%YI+u&s}L4haW<{b#I!!s2419aU5F*p3a0-a#Jeh*X}u~QL#+V&yH<myHhcnU@z
zfthoQmFNN-0UL+ON<0m%kD-CH=#+RCY=487^RH3jdHC%a1h`?V5?i5a6vTYRB_(>G
z`6Z}${Uar|L(3Rs@)%O$1?Vjy&3wgj6?Q_`R?@}`X)9IuGxU~{4ZL){3NJxR8R_LU
zH7dLewdG`hC-$qb2V7r~V!7s=3Vra$Hc}<O(yGF%5ZFOx${ntRY2=dyqVT69{sn&V
B{ha^+

diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-xrossim.metallib b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels-xrossim.metallib
index 7f65e70f7855706c6f038d64899b33a50c59ed09..8f8093b5cd2ef89ac2b1f1003d1daf63404c803e 100644
GIT binary patch
delta 1596
zcmXw33s4hR6n(qd?Awq8Hb7tv0X76J#Z29xh@-6};bYKhQNvWMGhGBkt6~(XcB)N6
z_$h=&QJ3236oNQZ>;D5|J5Ca)P>Th@Uj;3Grc-|%?5L%ck-lJiXU@C#p1t?IckkP|
zfBz8s<AvDJg_d_s7{Gx9fLaw0gRFbILg(VF=fslsIM(C%T6IZUlshuW9GP}q>Dt?J
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z8R=A+FByI{oYi+Ap@`d011%|6l=0T9zDzqdIY(AcmVd(y(N{30Cy6q0EBj~-MMlPK
z?qXIbU%b68kl~aWm&%jWy%i?*l~d*@ktY!slNYcu3vJ@DW{H&BKLRXdqAZ1I0_1?g
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z+z0}DT%eY$P44y#4)APE@q12(?%X?aGGBgX`Qaz;A3k&Qvw)Fut*^^dW81DfH+nr_
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z<C9$}uLp+K#i%o=vI^Vkb#ww68cAqqbfym`RYu`6fit(#KpkJ*Y3m$LFwwfPw0e<9
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ku7|9!xEC$@yD&xg=Qg1bCV60(P-hlPgq|K^y$B`z3q^SsmH+?%

delta 1601
zcmXw(4@?tR9LL{lkGr#6$F&wI{X?%*86j1#wG=ffy;7VEFcfiPPPa0|pc7Z8bH+{E
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diff --git a/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels.metallib b/Sources/UntoldEngine/UntoldEngineKernels/UntoldEngineKernels.metallib
index 4f9558b0d973095be017fbf04619d95ca572f737..ab18ecf9f90a09b51fe7034c9c0ef43acf6f9413 100644
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diff --git a/Sources/UntoldEngine/Utils/EngineSettingsAPI.swift b/Sources/UntoldEngine/Utils/EngineSettingsAPI.swift
index c2f98d94..8a9696b9 100644
--- a/Sources/UntoldEngine/Utils/EngineSettingsAPI.swift
+++ b/Sources/UntoldEngine/Utils/EngineSettingsAPI.swift
@@ -77,6 +77,14 @@ public enum RenderingEnvironmentProperty: Sendable {
     case visible(Bool)
     case lightingMode(RuntimeEnvironmentLightingMode)
     case realWorldLightingContribution(Float)
+    /// Loads an HDR environment asset and regenerates the IBL textures
+    /// (mipmaps + pre-filtered irradiance/specular).
+    ///
+    /// When `directory` is provided, `name` (including extension) is resolved
+    /// against it. Otherwise the engine's standard asset search is used —
+    /// notably `assetBasePath` (GameData) and its `HDR/` subfolder — trying
+    /// the `.hdr`, `.exr`, and `.png` extensions when `name` has none.
+    case asset(String, directory: URL? = nil)
 }
 
 public enum WireframeProperty: Sendable {
@@ -144,9 +152,41 @@ private func applyRenderingEnvironmentProperty(_ property: RenderingEnvironmentP
         RuntimeEnvironmentLightingStore.shared.mode = value
     case let .realWorldLightingContribution(value):
         RuntimeEnvironmentLightingStore.shared.realWorldLightingContribution = value
+    case let .asset(name, directory):
+        applyEnvironmentAsset(name, directory: directory)
     }
 }
 
+private func applyEnvironmentAsset(_ name: String, directory: URL?) {
+    // Explicit directory: preserve generateHDR's legacy behavior (name must
+    // include the file extension).
+    if let directory {
+        generateHDR(name, from: directory)
+        return
+    }
+
+    // No directory: resolve through the engine's standard asset search
+    // (assetBasePath/GameData incl. the HDR/ subfolder, app bundle, engine bundle).
+    let nsName = name as NSString
+    let providedExtension = nsName.pathExtension
+    let candidates: [(base: String, ext: String)] = providedExtension.isEmpty
+        ? ["hdr", "exr", "png"].map { (name, $0) }
+        : [(nsName.deletingPathExtension, providedExtension)]
+
+    for candidate in candidates {
+        if let url = LoadingSystem.shared.resourceURL(
+            forResource: candidate.base, withExtension: candidate.ext, subResource: nil
+        ) {
+            generateHDR(url.lastPathComponent, from: url.deletingLastPathComponent())
+            return
+        }
+    }
+
+    // Fall back to generateHDR's own resolution (engine bundle) so behavior
+    // degrades to the legacy path and its error reporting.
+    generateHDR(name, from: nil)
+}
+
 private func applyWireframeProperty(_ property: WireframeProperty) {
     wireframeRenderStateLock.lock()
     let current = wireframeRenderState
diff --git a/Sources/UntoldEngine/Utils/FuncUtils.swift b/Sources/UntoldEngine/Utils/FuncUtils.swift
index 5c4c9453..5449ddfa 100644
--- a/Sources/UntoldEngine/Utils/FuncUtils.swift
+++ b/Sources/UntoldEngine/Utils/FuncUtils.swift
@@ -105,6 +105,23 @@ public func loadHDR(_ textureName: String, from directory: URL? = nil) throws ->
 
     bitmapContext.draw(cgImage, in: CGRect(x: 0, y: 0, width: cgImage.width, height: cgImage.height))
 
+    // Sanitize the half-float pixels. Radiance RGBE can encode values beyond
+    // Float16 range (e.g. the sun disk in "puresky" HDRIs decodes to Inf).
+    // A single Inf/NaN poisons mip generation and the IBL pre-filter integral,
+    // which turns every IBL-lit object black. Inf -> max finite half (65504),
+    // NaN and negatives -> 0.
+    let componentCount = cgImage.width * cgImage.height * 4
+    let halfBits = bitmapContext.data!.bindMemory(to: UInt16.self, capacity: componentCount)
+    let maxFiniteHalf: UInt16 = 0x7BFF // 65504.0
+    for i in 0 ..< componentCount {
+        let bits = halfBits[i]
+        if bits & 0x8000 != 0 {
+            halfBits[i] = 0 // negative radiance is invalid
+        } else if bits & 0x7C00 == 0x7C00 {
+            halfBits[i] = (bits & 0x03FF) == 0 ? maxFiniteHalf : 0 // Inf : NaN
+        }
+    }
+
     let descriptor = MTLTextureDescriptor()
     descriptor.pixelFormat = .rgba16Float
     descriptor.width = cgImage.width
diff --git a/docs/API/UsingXRImmersionMode.md b/docs/API/UsingXRImmersionMode.md
new file mode 100644
index 00000000..dedb028c
--- /dev/null
+++ b/docs/API/UsingXRImmersionMode.md
@@ -0,0 +1,183 @@
+# Using XR Immersion Modes
+
+This guide shows how to run your Vision Pro game in **mixed** (passthrough) or
+**full** immersion mode, how to enable the environment (skybox), and how to
+load a custom IBL/HDR environment.
+
+---
+
+## Choosing an Immersion Mode
+
+Two settings control the immersion mode, and **they must match**:
+
+1. The SwiftUI `ImmersiveSpace` style in your app entry point.
+2. The engine's immersion mode, set with `setImmersionMode`.
+
+If they disagree — for example, the space is `.mixed` but the engine is set to
+`.full` — you will see camera passthrough bleeding through your scene or a
+black background where content should be.
+
+### Full Immersion
+
+Your rendered scene replaces the real world entirely. The environment map is
+used as the background.
+
+```swift
+@main
+struct MyGameApp: App {
+
+    @State private var immersionStyle: ImmersionStyle = .full
+
+    var body: some Scene {
+        ImmersiveSpace(id: "ImmersiveSpace") {
+            CompositorLayer(configuration: UntoldEngineConfiguration(), renderer: { layerRenderer in
+                if let xr = UntoldEngineXR(layerRenderer: layerRenderer) {
+                    XRHolder.shared.xr = xr
+
+                    // Must match the ImmersiveSpace style above
+                    xr.setImmersionMode(xrImmersionMode: .full)
+
+                    // ... game scene + callbacks + render thread setup
+                }
+            })
+        }
+        .immersionStyle(selection: $immersionStyle, in: .full)
+    }
+}
+```
+
+### Mixed Immersion (Passthrough)
+
+Your 3D content is composited over the real world. The environment map is not
+shown — the camera passthrough is your background.
+
+```swift
+@State private var immersionStyle: ImmersionStyle = .mixed
+```
+
+```swift
+xr.setImmersionMode(xrImmersionMode: .mixed)
+```
+
+```swift
+.immersionStyle(selection: $immersionStyle, in: .mixed)
+```
+
+### Supporting Both Modes
+
+Allow both styles in the space and keep the engine in sync whenever the
+selection changes:
+
+```swift
+.immersionStyle(selection: $immersionStyle, in: .mixed, .full)
+```
+
+```swift
+// Whenever you switch immersionStyle at runtime:
+XRHolder.shared.xr?.setImmersionMode(
+    xrImmersionMode: immersionStyle is FullImmersionStyle ? .full : .mixed
+)
+```
+
+---
+
+## Enabling the Environment
+
+Enable environment rendering from your `GameScene` setup:
+
+```swift
+setRendering(.environment(.visible(true)))
+```
+
+- In **full immersion**, the environment map fills the background behind your
+  scene.
+- In **mixed immersion**, the environment is not composited — passthrough is
+  the background — but the environment still drives image-based lighting (IBL)
+  on your objects.
+
+To control whether the environment contributes IBL lighting to your materials:
+
+```swift
+setRendering(.environment(.ibl(true)))   // objects are lit by the environment
+setRendering(.environment(.ibl(false)))  // disable environment lighting
+```
+
+### Lighting Mode
+
+Choose where environment lighting comes from:
+
+```swift
+// Use only your authored HDR environment for lighting
+setRendering(.environment(.lightingMode(.authoredOnly)))
+
+// Blend in the real-world lighting estimate (mixed immersion)
+setRendering(.environment(.lightingMode(.realWorldEstimate)))
+setRendering(.environment(.realWorldLightingContribution(1.0)))
+```
+
+---
+
+## Setting a Custom IBL Environment
+
+Load your own HDR environment with the `.asset` property. The engine loads the
+image, generates mipmaps, and rebuilds the IBL textures (irradiance, specular,
+BRDF) in one call:
+
+```swift
+setRendering(.environment(.asset("suburban_garden_2k.hdr")))
+```
+
+### Where to Put the File
+
+Place the HDR inside your project's `GameData/HDR` folder:
+
+```
+MyGame/
+└── Sources/
+    └── MyGame/
+        └── GameData/
+            └── HDR/
+                └── suburban_garden_2k.hdr
+```
+
+The name is resolved through the engine's standard asset search
+(`assetBasePath`, which the generated project points at `GameData`). The
+extension is optional — when omitted, the engine tries `.hdr`, `.exr`, and
+`.png` in that order:
+
+```swift
+setRendering(.environment(.asset("suburban_garden_2k")))
+```
+
+### Loading From a Custom Location
+
+Pass an explicit directory (the name must include the extension), or use an
+absolute path:
+
+```swift
+setRendering(.environment(.asset("studio.hdr", directory: myAssetsURL)))
+
+setRendering(.environment(.asset("/Users/me/HDRIs/studio.hdr")))
+```
+
+### HDR File Guidelines
+
+- Use an **equirectangular** image with a **2:1 aspect ratio** (e.g.
+  2048×1024).
+- **2K is the recommended resolution** — it keeps memory low (~20 MB on the
+  GPU) and looks sharp as a background. IBL lighting quality does not improve
+  beyond 2K.
+- Load the environment during scene setup (for example in your `GameScene`
+  init), not every frame — the call blocks briefly while the IBL textures are
+  generated.
+
+### Complete Example
+
+```swift
+private func configureEngineSystems() {
+    setRendering(.environment(.visible(true)))
+    setRendering(.environment(.ibl(true)))
+    setRendering(.environment(.lightingMode(.authoredOnly)))
+    setRendering(.environment(.asset("suburban_garden_2k.hdr")))
+}
+```
diff --git a/mkdocs.yml b/mkdocs.yml
index 7c145abc..0cb60631 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -55,6 +55,7 @@ nav:
     - Spatial Input: API/UsingSpatialInput.md
     - Lighting System: API/UsingLightingSystem.md
     - XR Lighting: API/UsingXRLighting.md
+    - XR Immersion Modes: API/UsingXRImmersionMode.md
     - Scene Channels: API/UsingSceneChannels.md
     - Light Portals: API/UsingLightPortals.md
     - Materials: API/UsingMaterials.md