Water: clipping plane offset

apps/openmw/mwrender/water.cpp

@@ -142,8 +142,6 @@ class ClipCullNode : public osg::Group
 
             osg::Polytope::PlaneList origPlaneList = cv->getProjectionCullingStack().back().getFrustum().getPlaneList();
 
-            // TODO: offset plane towards the viewer to fix bleeding at the water shore
-
             osg::Plane plane = *mCullPlane;
             plane.transform(*cv->getCurrentRenderStage()->getInitialViewMatrix());
 
@@ -175,19 +173,22 @@ class ClipCullNode : public osg::Group
         {
             osgUtil::CullVisitor* cv = static_cast<osgUtil::CullVisitor*>(nv);
             osg::Vec3d eyePoint = cv->getEyePoint();
+
+            osg::RefMatrix* modelViewMatrix = new osg::RefMatrix(*cv->getModelViewMatrix());
+
             // flip the below graph if the eye point is above the plane
             if (mCullPlane->intersect(osg::BoundingSphere(osg::Vec3d(0,0,eyePoint.z()), 0)) > 0)
             {
-                osg::RefMatrix* modelViewMatrix = new osg::RefMatrix(*cv->getModelViewMatrix());
                 modelViewMatrix->preMultScale(osg::Vec3(1,1,-1));
+            }
+            // move the plane back along its normal a little bit to prevent bleeding at the water shore
+            const float clipFudge = 5;
+            modelViewMatrix->preMultTranslate(mCullPlane->getNormal() * (-clipFudge));
 
             cv->pushModelViewMatrix(modelViewMatrix, osg::Transform::RELATIVE_RF);
             traverse(node, nv);
             cv->popModelViewMatrix();
         }
-            else
-                traverse(node, nv);
-        }
 
     private:
         const osg::Plane* mCullPlane;

files/shaders/water_fragment.glsl

@@ -21,8 +21,8 @@ const float WAVE_CHOPPYNESS = 0.05;                // wave choppyness
 const float WAVE_SCALE = 75.0;                     // overall wave scale
 
 const float BUMP = 0.5;                            // overall water surface bumpiness
-const float REFL_BUMP = 0.15;                      // reflection distortion amount
-const float REFR_BUMP = 0.06;                      // refraction distortion amount
+const float REFL_BUMP = 0.10;                      // reflection distortion amount
+const float REFR_BUMP = 0.07;                      // refraction distortion amount
 
 const float SCATTER_AMOUNT = 0.3;                  // amount of sunlight scattering
 const vec3 SCATTER_COLOUR = vec3(0.0,1.0,0.95);    // colour of sunlight scattering