reimplements a form of subsurface scattering

Engine/source/materials/processedShaderMaterial.cpp

@@ -1153,7 +1153,8 @@ void ProcessedShaderMaterial::_setShaderConstants(SceneRenderState * state, cons
 
    // Deferred Shading: Determine Material Info Flags
    S32 matInfoFlags = 
-            (mMaterial->mEmissive[stageNum] ? 1 : 0);
+            (mMaterial->mEmissive[stageNum] ? 1 : 0) | //emissive
+            (mMaterial->mSubSurface[stageNum] ? 2 : 0); //subsurface
    mMaterial->mMatInfoFlags[stageNum] = matInfoFlags / 255.0f;
    shaderConsts->setSafe(handles->mMatInfoFlagsSC, mMaterial->mMatInfoFlags[stageNum]);   
    if( handles->mAccuScaleSC->isValid() )

Templates/Full/game/shaders/common/lighting/advanced/vectorLightP.hlsl

@@ -202,6 +202,16 @@ float4 main( FarFrustumQuadConnectP IN ) : TORQUE_TARGET0
        return float4(1.0, 1.0, 1.0, 0.0);
    }
    
+   float4 colorSample = TORQUE_TEX2D( colorBuffer, IN.uv0 );
+   float3 subsurface = float3(0.0,0.0,0.0); 
+   if (getFlag( matInfo.r, 1 ))
+   {
+      subsurface =colorSample;
+      if (colorSample.r>colorSample.g)
+         subsurface.r*=2;
+	  else
+         subsurface.g*=2;
+	}
    // Sample/unpack the normal/z data
    float4 prepassSample = TORQUE_PREPASS_UNCONDITION( prePassBuffer, IN.uv0 );
    float3 normal = prepassSample.rgb;
@@ -314,6 +324,5 @@ float4 main( FarFrustumQuadConnectP IN ) : TORQUE_TARGET0
       lightColorOut = debugColor;
    #endif
 
-   float4 colorSample = TORQUE_TEX2D( colorBuffer, IN.uv0 );
-   return AL_DeferredOutput(lightColorOut, colorSample.rgb, matInfo, addToResult, specular, Sat_NL_Att);
+   return AL_DeferredOutput(lightColorOut+subsurface*(2.0-Sat_NL_Att), colorSample.rgb, matInfo, addToResult, specular, Sat_NL_Att);
 }

Templates/Full/game/tools/materialEditor/gui/guiMaterialPropertiesWindow.ed.gui

@@ -2240,6 +2240,29 @@
                            useMouseEvents = "0";
                            useInactiveState = "0";
                         };
+                        new GuiCheckBoxCtrl() {
+                           canSaveDynamicFields = "0";
+                           internalName = "subSurfaceCheckbox";
+                           Enabled = "1";
+                           isContainer = "0";
+                           Profile = "ToolsGuiCheckBoxProfile";
+                           HorizSizing = "right";
+                           VertSizing = "bottom";
+                           position = "8 46";
+                           Extent = "79 16";
+                           MinExtent = "8 2";
+                           canSave = "1";
+                           Visible = "1";
+                           Command = "MaterialEditorGui.updateActiveMaterial(\"subSurface[\" @ MaterialEditorGui.currentLayer @ \"]\", $ThisControl.getValue());";
+                           tooltipprofile = "ToolsGuiDefaultProfile";
+                           ToolTip = "Enables the use of subsurface scattering for this layer.";
+                           hovertime = "1000";
+                           text = "Sub Surface";
+                           groupNum = "-1";
+                           buttonType = "ToggleButton";
+                           useMouseEvents = "0";
+                           useInactiveState = "0";
+                        };
                      };
                   };
                };