Phase 4.2: match grass blade colors to voxel faces + stronger translucency

Use same ambient (0.15, 0.18, 0.25) as voxel PS instead of greener
tint. Increase translucency (0.6) to reduce contrast when orbiting
around grass. Wrap at 0.85 for balanced lit-side brightness.

shaders/voxelTopingPS.hlsl

@@ -53,17 +53,18 @@ float4 main(PSInput input) : SV_TARGET0 {
         float wrap = halfLambert * halfLambert; // squared for falloff shape
 
         // Translucency: thin blades let light through from behind
-        // Simple SSS approximation: light arriving from the back side
+        // Stronger effect to reduce contrast when orbiting around grass
         float3 V = normalize(cameraPosition.xyz - input.worldPos);
-        float backLight = saturate(dot(V, L)); // view aligned with light = backlit
+        float backLight = saturate(dot(V, L));
-        float transAmount = (1.0 - saturate(rawNdotL)) * 0.4; // stronger when facing away from light
+        float transAmount = (1.0 - saturate(rawNdotL)) * 0.8;
         float translucency = backLight * transAmount;
 
-        // Warm vegetation ambient (higher than stone, slightly green-tinted)
+        // Same ambient as voxel faces for color consistency
-        float3 vegAmbient = float3(0.22, 0.28, 0.20);
+        float3 ambient = float3(0.15, 0.18, 0.25);
 
-        float3 diffuse = sunColor.rgb * (wrap * 0.7 + translucency * 0.5);
+        // Wrap + strong translucency to minimize light/dark contrast
-        lit = texColor * (diffuse + vegAmbient);
+        float3 diffuse = sunColor.rgb * (wrap * 0.85 + translucency * 0.6);
+        lit = texColor * (diffuse + ambient);
     }
 
     return float4(lit, 1.0);