From b7ba58c8f2951e10ac804fda3c27a07a68bfca76 Mon Sep 17 00:00:00 2001
From: Qlonever <42286723+Qlonever@users.noreply.github.com>
Date: Tue, 11 Apr 2023 21:03:28 -0400
Subject: [PATCH] Offsets reflection/refraction clip plane based on camera
 height and FOV

---
 apps/openmw/mwrender/water.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/apps/openmw/mwrender/water.cpp b/apps/openmw/mwrender/water.cpp
index 5c57764c80..9bbee009f6 100644
--- a/apps/openmw/mwrender/water.cpp
+++ b/apps/openmw/mwrender/water.cpp
@@ -111,9 +111,11 @@ namespace MWRender
                 }
 
                 // 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);
-
+                unsigned int fov = Settings::Manager::getInt("field of view", "Camera");
+                const float clipFudge = 2.5; // minimum offset of clip plane
+                const float clipFudgeScale = 1.0; // additional offset of clip plane when standing at shore level with default FOV
+                float clipOffset = abs(abs((*mCullPlane)[3]) - eyePoint.z()) * (clipFudgeScale * fov / (-7500.0)) - clipFudge;
+                modelViewMatrix->preMultTranslate(mCullPlane->getNormal() * clipOffset);
                 cv->pushModelViewMatrix(modelViewMatrix, osg::Transform::RELATIVE_RF);
                 traverse(node, cv);
                 cv->popModelViewMatrix();