wip : fog sam

2026-06-15 16:41:00 +02:00
parent 3d3b6f59b4
commit 1681dd47dd
17 changed files with 6289 additions and 104 deletions
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+#ifndef FOG_INCLUDED
+#define FOG_INCLUDED
+
+#include "Assets/_Content/Shaders/Include/Noises.hlsl"
+
+void Fog_float
+(
+    float4 ColorA,
+    float4 ColorB,
+    float4 ColorC,
+    float4 ColorD,
+    float DepthAtten,
+    float3 PositionWS,
+    float3 PositionOS,
+    float3 PivotWS,
+    float3 Scale,
+    float SpikeAmount,
+    float SpikeScale,
+    float SpikeTilt,
+    float SpikeSpeed,
+    float PaintSteps,
+    float GrainAmount,
+    out float3 Output,
+    out float Alpha
+)
+{
+    float3 camPos = _WorldSpaceCameraPos.xyz;
+    float depth = distance(camPos, PositionWS);
+    float depthAtten = lerp(1, smoothstep(5, 30, depth), DepthAtten);
+
+    float t = _Time.y * .7;
+    float s = lerp(Scale.x, 1, .3);
+
+    // Base sampling position, scrolling over time
+    float3 p = PositionWS;
+    p += float3(t, t * .2, t);
+
+    // Domain warp for organic fog shapes
+    float noise = RidgedNoise3D(p - PivotWS * .9, .1, 5, 1.6, 1);
+    p += noise * 3;
+
+    // Base fog density
+    float fog = saturate(FBMNoise3D((p - PivotWS * .5), 10 / s, 3, 1.5, .5));
+
+    // --- Painterly grain ---
+    float grain = FBMNoise3D(PositionWS * 25, 4, 2, 2, .5);
+    grain = grain * 2 - 1;
+
+    // --- Color bands ---
+    float colorMask = saturate(RidgedNoise3D((p - PivotWS * .9) * float3(1, 1.6, 1), 3 / s, 3, 1.6, 1));
+    float paintMask = saturate(colorMask + grain * 0.03);
+    paintMask = floor(paintMask * PaintSteps) / max(PaintSteps - 1, 1);
+
+    float4 col = lerp(ColorA, ColorB, smoothstep(0.0, 0.4, paintMask));
+    col = lerp(col, ColorC, smoothstep(0.35, 0.65, paintMask));
+    col = lerp(col, ColorD, smoothstep(0.6, 1.0, paintMask));
+
+    float luma = dot(col.rgb, float3(0.299, 0.587, 0.114));
+    col.rgb = lerp(col.rgb, luma.xxx, 0.15);
+    col.rgb *= (1 + grain * GrainAmount);
+
+    // --- Ground glow ---
+    float height01 = saturate(PositionOS.y / 0.3);
+    float groundMask = pow(1 - height01, 2);
+
+   // --- Reference vector from pivot ---
+    float2 radial = PositionWS.xz - PivotWS.xz;
+
+    // Smooth left/right factor, zero exactly at the front/back seams of the circle
+    float sideSign = clamp(radial.x / (Scale.x * 0.3 + 0.001), -1, 1);
+
+    // Tangential direction (= "around the circle")
+    float2 tangentDir = normalize(float2(-radial.y, radial.x));
+
+    // --- Spikes: lean + drift tangentially, direction flips per side ---
+    float2 spikeXZ = radial + tangentDir * (SpikeTilt * height01 * sideSign);
+
+    // Tangential animation, same sign as the lean -> each half rotates outward, opposite directions
+    spikeXZ += tangentDir * (t * SpikeSpeed * sideSign);
+    // Horizontal-only animation, drifting outward (same direction as the tilt)
+    spikeXZ.y -= t * SpikeSpeed * sideSign;
+
+    // Low frequency field defines the spike's overall height/silhouette
+    // (low freq -> the lean doesn't break the shape into zigzags)
+    float spikeField = saturate(FBMNoise3D(float3(spikeXZ.x, spikeXZ.y, 0), SpikeScale * 0.3, 3, 2, .5));
+    spikeField = pow(spikeField, 4) * SpikeAmount;
+    spikeField = min(spikeField, 0.7); // never reaches the sky
+
+    // High frequency detail -> subtle jagged/organic edges only
+    float edgeWarp = RidgedNoise3D(float3(spikeXZ * 4, t * 0.1), .1, 3, 2, .5);
+    float veins = RidgedNoise3D(float3(spikeXZ * 12, t * 0.05), .1, 4, 2.2, .6);
+    spikeField *= lerp(0.75, 1.0, veins);
+
+    float spikeMask = smoothstep(spikeField, spikeField - 0.04, height01 + edgeWarp * 0.02);
+
+    // --- Tall organic bars reaching toward the sky ---
+    float2 barXZ = radial + float2(SpikeTilt * 0.3 * height01 * sideSign, 0);
+
+    float phase = FBMNoise3D(float3(radial * 0.2, t * 0.02), 1, 2, 2, .5) * 6.2831;
+    float wobble = sin(height01 * 6.2831 * 1.5 + phase) * 2.5 * height01;
+    barXZ.x += wobble;
+
+    float barField = saturate(FBMNoise3D(float3(barXZ * 0.4, t * 0.02), 1, 3, 2, .5));
+    barField = saturate(pow(barField, 3) * 1.1);
+
+    float barMask = smoothstep(barField, barField - 0.2, height01);
+
+    // --- Combine ---
+    float combinedMask = saturate(max(groundMask, max(spikeMask, barMask)));
+
+    // Spikes read as red glowing veins; bars keep the painted color bands
+    col.rgb = lerp(col.rgb, ColorA.rgb, spikeMask);
+
+    // --- Final output ---
+    Output = saturate(col.rgb);
+    Alpha = saturate(fog * combinedMask * lerp(.2, 1, smoothstep(0, 15, depth)) * col.a);
+}
+
+#endif
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