adminandClaude Opus 4.8
fdcb4f8d8a
Reuse the existing occlusion paint channel (no new map, MAP_COUNT stays 3): 0.5 is neutral, above 0.5 raises a hill, below 0.5 sinks a hole and also fades ambient occlusion (saturate(2*occ)). Bind the MSO map to _ParallaxMap, enable _PARALLAXMAP, derive a relief normal from the height gradient, and reseed unpainted occlusion to 0.5 so untouched surfaces stay visually neutral. Pin the _PARALLAXMAP runtime variant in the build keep-alive material. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
287 lines
14 KiB
HLSL
287 lines
14 KiB
HLSL
#ifndef PLAYER_CAMO_INCLUDED
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#define PLAYER_CAMO_INCLUDED
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// Camouflage lighting for the player avatar. Goal: keep the player painted to match its
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// surroundings while de-emphasising the 3D FORM, so a correctly painted avatar is harder to spot.
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// Knobs - _HalfLambert at 0 and _HalfLambertBrightness at 0 => byte-identical URP/Lit:
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//
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// _HalfLambert (0..1): form-flattening diffuse over two segments -
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// 0 -> saturate(N.L) plain Lambert (no-op)
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// 0.5 -> N.L * 0.5 + 0.5 classic half-Lambert (soft terminator,
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// no hard, form-revealing shadow line)
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// 1 -> 1 fully FLAT: the direct diffuse no longer
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// reveals the 3D form. View-INDEPENDENT
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// (operates on the shading term, not a view-/light-bent normal, so
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// there is no bright/dark flip when orbiting). The DIRECT specular
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// highlight (a strong shape cue) is faded out with it, gone at 1.
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// _HalfLambertBrightness (-1..1): additive shift of the (flattened) diffuse term, default 0. Tunes
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// the body brighter/darker to match the scene tone (e.g. flatten to
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// 1, then dial this down to sink into a dark scene). Clamped at 0.
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// _SpecularDampen (0..1): scales down the DIRECT specular highlight (a strong shape cue) on
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// top of the _HalfLambert fade.
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//
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// Implementation note: URP's LightingPhysicallyBased() hard-codes saturate(N.L) inline with no
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// override hook, so the dark-converging half-Lambert needs the forward light loop reimplemented.
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// This file is a 1:1 copy of URP 17.3 UniversalFragmentPBR that delegates ALL the fragile parts
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// (GI / APV / shadow mask / AO / clustered light loop / final color) to URP's own helpers and only
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// swaps the per-light shading call for the camo variant below.
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//
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// Declared OUTSIDE UnityPerMaterial (LitInput.hlsl owns that CBUFFER). The player is a handful of
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// instances, so the resulting SRP-batcher break is irrelevant.
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half _HalfLambert;
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half _HalfLambertBrightness;
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half _SpecularDampen;
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// --- Painted height (from the occlusion channel) ---
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// The painted occlusion value (G of the MSO mask map, bound to _OcclusionMap AND _ParallaxMap) is
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// reinterpreted as a 0.5-centred HEIGHT field:
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// 0.5 -> neutral: no displacement, flat relief normal, AO = 1 (identical to the unpainted look)
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// <0.5 -> recessed (hole) >0.5 -> raised (hill)
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// The UV displacement is URP's stock single-step parallax (ParallaxOffset1Step already does
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// height*amp - amp/2, i.e. the 0.5 centring) under the _PARALLAXMAP keyword. Here we add the
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// matching per-pixel relief NORMAL from the height gradient (the dominant cue) and remap the ambient
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// occlusion so only the LOWER half darkens: AO = saturate(occ*2) (occ>=0.5 -> no darkening, occ in
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// [0,0.5] -> AO 1..0). Declared outside UnityPerMaterial like the camo knobs above (the player is a
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// handful of instances, so the SRP-batcher break is irrelevant).
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half _HeightNormalStrength;
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float4 _OcclusionMap_TexelSize;
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// Remaps the painted occlusion/height value into surface AO + a relief normal. Runs after URP's
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// InitializeStandardLitSurfaceData (uv is already parallax-displaced) and before InitializeInputData,
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// so the relief normal flows into inputData.normalWS through the tangent frame.
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void ApplyPaintedHeightSurface(float2 uv, inout SurfaceData surfaceData)
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{
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#if defined(_OCCLUSIONMAP)
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// Lower-half AO remap: occ>=0.5 stays fully lit, occ in [0,0.5] darkens toward 0.
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half occ = SAMPLE_TEXTURE2D(_OcclusionMap, sampler_OcclusionMap, uv).g;
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surfaceData.occlusion = LerpWhiteTo(saturate(occ * 2.0h), _OcclusionStrength);
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#endif
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#if defined(_PARALLAXMAP)
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// Per-pixel relief normal from the height (occlusion) gradient via central differences over one
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// texel. A flat field (occ=0.5 everywhere) yields zero deltas -> (0,0,1), so neutral stays unbent.
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float2 texel = _OcclusionMap_TexelSize.xy;
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half hL = SAMPLE_TEXTURE2D(_OcclusionMap, sampler_OcclusionMap, uv - float2(texel.x, 0.0)).g;
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half hR = SAMPLE_TEXTURE2D(_OcclusionMap, sampler_OcclusionMap, uv + float2(texel.x, 0.0)).g;
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half hD = SAMPLE_TEXTURE2D(_OcclusionMap, sampler_OcclusionMap, uv - float2(0.0, texel.y)).g;
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half hU = SAMPLE_TEXTURE2D(_OcclusionMap, sampler_OcclusionMap, uv + float2(0.0, texel.y)).g;
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half3 reliefTS = normalize(half3((hL - hR) * _HeightNormalStrength,
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(hD - hU) * _HeightNormalStrength, 1.0h));
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surfaceData.normalTS = BlendNormalRNM(surfaceData.normalTS, reliefTS);
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#endif
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}
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// Per-light shading: copy of URP's LightingPhysicallyBased with the diffuse term wrapped
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// (half-Lambert) and the specular term dampened. Diffuse and specular use SEPARATE radiance so the
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// wrap lifts only the diffuse shadow side and never smears specular onto back faces.
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half3 LightingPhysicallyBasedCamo(BRDFData brdfData, BRDFData brdfDataClearCoat,
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half3 lightColor, half3 lightDirectionWS, float lightAttenuation,
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half3 normalWS, half3 viewDirectionWS,
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half clearCoatMask, bool specularHighlightsOff)
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{
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half NdotL = dot(normalWS, lightDirectionWS);
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half ndlSat = saturate(NdotL);
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// Form-flattening diffuse driven by _HalfLambert over two segments:
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// 0 -> saturate(N.L) plain Lambert (no-op, byte-identical URP/Lit)
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// 0.5 -> N.L * 0.5 + 0.5 classic half-Lambert (soft terminator, no hard shadow line)
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// 1 -> 1 fully flat: the direct diffuse no longer reveals the 3D form.
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// _HalfLambertBrightness then shifts the whole (flattened) term up/down to tune the body tone;
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// clamped at 0 so it never produces negative light.
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half classicHL = NdotL * 0.5h + 0.5h; // already in [0,1] for N.L in [-1,1]
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half t1 = saturate(_HalfLambert * 2.0h); // 0..1 across _HalfLambert in [0, 0.5]
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half t2 = saturate(_HalfLambert * 2.0h - 1.0h); // 0..1 across _HalfLambert in [0.5, 1]
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half diffuseTerm = lerp(lerp(ndlSat, classicHL, t1), 1.0h, t2);
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diffuseTerm = max(0.0h, diffuseTerm + _HalfLambertBrightness);
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half3 atten = lightColor * lightAttenuation;
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half3 diffuseRadiance = atten * diffuseTerm; // flattened + brightness-shifted
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half3 specularRadiance = atten * ndlSat; // clamped (no back-face specular)
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half3 color = brdfData.diffuse * diffuseRadiance;
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#ifndef _SPECULARHIGHLIGHTS_OFF
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[branch] if (!specularHighlightsOff)
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{
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half3 spec = brdfData.specular * DirectBRDFSpecular(brdfData, normalWS, lightDirectionWS, viewDirectionWS);
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#if defined(_CLEARCOAT) || defined(_CLEARCOATMAP)
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// Inert for URP/Lit (no clear-coat keywords on the forward pass); kept for fidelity.
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half brdfCoat = kDielectricSpec.r * DirectBRDFSpecular(brdfDataClearCoat, normalWS, lightDirectionWS, viewDirectionWS);
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half NoV = saturate(dot(normalWS, viewDirectionWS));
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half coatFresnel = kDielectricSpec.x + kDielectricSpec.a * Pow4(1.0 - NoV);
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spec = spec * (1.0 - clearCoatMask * coatFresnel) + (brdfCoat * clearCoatMask).xxx;
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#endif
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// Fade the bright, form-revealing highlight out with _HalfLambert (gone at 1, so no highlight
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// survives at full camo), on top of the explicit _SpecularDampen.
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spec *= (1.0h - _SpecularDampen) * (1.0h - _HalfLambert);
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color += spec * specularRadiance;
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}
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#endif
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return color;
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}
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half3 LightingPhysicallyBasedCamo(BRDFData brdfData, BRDFData brdfDataClearCoat, Light light,
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half3 normalWS, half3 viewDirectionWS, half clearCoatMask, bool specularHighlightsOff)
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{
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return LightingPhysicallyBasedCamo(brdfData, brdfDataClearCoat, light.color, light.direction,
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light.distanceAttenuation * light.shadowAttenuation, normalWS, viewDirectionWS,
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clearCoatMask, specularHighlightsOff);
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}
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// Faithful copy of URP 17.3 UniversalFragmentPBR. ONLY change vs. stock: the three per-light calls
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// go to LightingPhysicallyBasedCamo (above). Everything else delegates to URP unchanged.
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half4 UniversalFragmentCamo(InputData inputData, SurfaceData surfaceData)
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{
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#if defined(_SPECULARHIGHLIGHTS_OFF)
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bool specularHighlightsOff = true;
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#else
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bool specularHighlightsOff = false;
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#endif
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BRDFData brdfData;
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// NOTE: can modify "surfaceData"...
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InitializeBRDFData(surfaceData, brdfData);
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#if defined(DEBUG_DISPLAY)
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half4 debugColor;
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if (CanDebugOverrideOutputColor(inputData, surfaceData, brdfData, debugColor))
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{
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return debugColor;
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}
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#endif
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BRDFData brdfDataClearCoat = CreateClearCoatBRDFData(surfaceData, brdfData);
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half4 shadowMask = CalculateShadowMask(inputData);
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AmbientOcclusionFactor aoFactor = CreateAmbientOcclusionFactor(inputData, surfaceData);
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uint meshRenderingLayers = GetMeshRenderingLayer();
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Light mainLight = GetMainLight(inputData, shadowMask, aoFactor);
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MixRealtimeAndBakedGI(mainLight, inputData.normalWS, inputData.bakedGI);
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LightingData lightingData = CreateLightingData(inputData, surfaceData);
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lightingData.giColor = GlobalIllumination(brdfData, brdfDataClearCoat, surfaceData.clearCoatMask,
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inputData.bakedGI, aoFactor.indirectAmbientOcclusion, inputData.positionWS,
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inputData.normalWS, inputData.viewDirectionWS, inputData.normalizedScreenSpaceUV);
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#ifdef _LIGHT_LAYERS
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if (IsMatchingLightLayer(mainLight.layerMask, meshRenderingLayers))
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#endif
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{
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lightingData.mainLightColor = LightingPhysicallyBasedCamo(brdfData, brdfDataClearCoat,
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mainLight,
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inputData.normalWS, inputData.viewDirectionWS,
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surfaceData.clearCoatMask, specularHighlightsOff);
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}
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#if defined(_ADDITIONAL_LIGHTS)
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uint pixelLightCount = GetAdditionalLightsCount();
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#if USE_CLUSTER_LIGHT_LOOP
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[loop] for (uint lightIndex = 0; lightIndex < min(URP_FP_DIRECTIONAL_LIGHTS_COUNT, MAX_VISIBLE_LIGHTS); lightIndex++)
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{
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CLUSTER_LIGHT_LOOP_SUBTRACTIVE_LIGHT_CHECK
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Light light = GetAdditionalLight(lightIndex, inputData, shadowMask, aoFactor);
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#ifdef _LIGHT_LAYERS
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if (IsMatchingLightLayer(light.layerMask, meshRenderingLayers))
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#endif
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{
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lightingData.additionalLightsColor += LightingPhysicallyBasedCamo(brdfData, brdfDataClearCoat, light,
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inputData.normalWS, inputData.viewDirectionWS,
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surfaceData.clearCoatMask, specularHighlightsOff);
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}
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}
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#endif
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LIGHT_LOOP_BEGIN(pixelLightCount)
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Light light = GetAdditionalLight(lightIndex, inputData, shadowMask, aoFactor);
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#ifdef _LIGHT_LAYERS
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if (IsMatchingLightLayer(light.layerMask, meshRenderingLayers))
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#endif
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{
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lightingData.additionalLightsColor += LightingPhysicallyBasedCamo(brdfData, brdfDataClearCoat, light,
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inputData.normalWS, inputData.viewDirectionWS,
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surfaceData.clearCoatMask, specularHighlightsOff);
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}
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LIGHT_LOOP_END
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#endif
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#if defined(_ADDITIONAL_LIGHTS_VERTEX)
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lightingData.vertexLightingColor += inputData.vertexLighting * brdfData.diffuse;
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#endif
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#if REAL_IS_HALF
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return min(CalculateFinalColor(lightingData, surfaceData.alpha), HALF_MAX);
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#else
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return CalculateFinalColor(lightingData, surfaceData.alpha);
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#endif
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}
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// Replicates URP's LitPassFragment body. The camo flattening lives entirely in the light loop
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// (UniversalFragmentCamo), so the true normal is kept and GI/reflections stay physically correct.
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void CamoForwardFragment(
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Varyings input
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, out half4 outColor : SV_Target0
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#ifdef _WRITE_RENDERING_LAYERS
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, out uint outRenderingLayers : SV_Target1
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#endif
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)
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{
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UNITY_SETUP_INSTANCE_ID(input);
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
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#if defined(_PARALLAXMAP)
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#if defined(REQUIRES_TANGENT_SPACE_VIEW_DIR_INTERPOLATOR)
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half3 viewDirTS = input.viewDirTS;
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#else
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half3 viewDirWS = GetWorldSpaceNormalizeViewDir(input.positionWS);
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half3 viewDirTS = GetViewDirectionTangentSpace(input.tangentWS, input.normalWS, viewDirWS);
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#endif
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ApplyPerPixelDisplacement(viewDirTS, input.uv);
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#endif
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SurfaceData surfaceData;
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InitializeStandardLitSurfaceData(input.uv, surfaceData);
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// Painted height: reinterpret the occlusion channel as a 0.5-centred height -> remap the AO
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// (only the lower half darkens) and add a relief normal from the height gradient. The uv is
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// already parallax-displaced above (_PARALLAXMAP), so this stays consistent with the offset.
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ApplyPaintedHeightSurface(input.uv, surfaceData);
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#ifdef LOD_FADE_CROSSFADE
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LODFadeCrossFade(input.positionCS);
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#endif
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InputData inputData;
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InitializeInputData(input, surfaceData.normalTS, inputData);
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// Camo: the MACRO form is de-emphasised purely inside the light loop (direct diffuse driven toward
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// the dark/shadow value + specular faded), so the body's true shape is kept here and GI/reflections
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// stay physically correct - no macro normal bending, so no bright/dark flip when orbiting. The
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// painted height above intentionally adds LOCAL relief normals (holes/hills) on top of that.
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SETUP_DEBUG_TEXTURE_DATA(inputData, UNDO_TRANSFORM_TEX(input.uv, _BaseMap));
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#if defined(_DBUFFER)
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ApplyDecalToSurfaceData(input.positionCS, surfaceData, inputData);
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#endif
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InitializeBakedGIData(input, inputData);
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half4 color = UniversalFragmentCamo(inputData, surfaceData);
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color.rgb = MixFog(color.rgb, inputData.fogCoord);
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color.a = OutputAlpha(color.a, IsSurfaceTypeTransparent(_Surface));
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outColor = color;
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#ifdef _WRITE_RENDERING_LAYERS
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outRenderingLayers = EncodeMeshRenderingLayer();
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#endif
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}
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#endif
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