Increase scale range + expose shrink factor

Signed-off-by: Santi Paprika <santi.gonzalez.cs@gmail.com>
2021-11-29 20:22:31 +01:00
parent 9825d6aba3
commit 1417488a2b
4 changed files with 16 additions and 2 deletions
@@ -142,7 +142,7 @@ VSOutput SkinVS(VSInput IN)
    const uint shadowIndex = ViewSrg::m_shadowIndexDirectionalLight;
    DirectionalLightShadow::GetShadowCoords(
        shadowIndex,
-        worldPosition - 0.005 * OUT.m_normal,
+        worldPosition - MaterialSrg::m_shrinkFactor * OUT.m_normal,
        OUT.m_normal,
        OUT.m_shrinkedShadowCoords);
        
@@ -637,6 +637,19 @@
                    "min": 0.0,
                    "softMax": 20.0
                },
+                {
+                    "name": "shrinkFactor",
+                    "displayName": "    Shrink Factor",
+                    "description": "Shrink (absolute) offset towards the normal opposite direction to ensure correct shadow map projection",
+                    "type": "float",
+                    "defaultValue": 0.005,
+                    "min": 0.0,
+                    "softMax": 0.05,
+                    "connection": {
+                        "type": "ShaderInput",
+                        "name": "m_shrinkFactor"
+                    }
+                },
                {
                    "name": "transmissionScale",
                    "displayName": "    Scale",
@@ -71,6 +71,7 @@ ShaderResourceGroup MaterialSrg : SRG_PerMaterial
    float4 m_transmissionTintThickness;
    Texture2D m_transmissionThicknessMap;
    uint m_transmissionThicknessMapUvIndex;
+    float m_shrinkFactor;
    
    Texture2D m_wrinkle_baseColor_texture1;
    Texture2D m_wrinkle_baseColor_texture2;
@@ -68,7 +68,7 @@ float3 GetBackLighting(Surface surface, LightingData lightingData, float3 lightI
                float E = max(0.30 + dot(-surface.normal, dirToLight), 0.0);

                // Transmission distance computed from shadowmaps modulated by editor-exposed parameters
-                float s = transmissionDistance * surface.transmission.thickness * (20 - transmissionParams.w) * 10;
+                float s = transmissionDistance * surface.transmission.thickness * (50 - transmissionParams.w) * 10;
                
                // Albedo at front (surface point) is used to approximate irradiance at the back of the object
                // See observation 4 in [Jimenez J. et al, 2010]