Merge branch 'fix_some_terrain_bug' into 'master'

CS: Make painting terrain height over a cell border equalize the height at both edge

See merge request OpenMW/openmw!4898

apps/opencs/view/render/cell.cpp

@@ -371,6 +371,11 @@ float CSVRender::Cell::getSumOfAlteredAndTrueHeight(int cellX, int cellY, int in
     return mTerrainStorage->getSumOfAlteredAndTrueHeight(cellX, cellY, inCellX, inCellY);
 }
 
+std::optional<float> CSVRender::Cell::getOriginalHeight(int cellX, int cellY, int inCellX, int inCellY)
+{
+    return mTerrainStorage->getOriginalHeight(cellX, cellY, inCellX, inCellY);
+}
+
 float* CSVRender::Cell::getAlteredHeight(int inCellX, int inCellY)
 {
     return mTerrainStorage->getAlteredHeight(inCellX, inCellY);

apps/opencs/view/render/cell.hpp

@@ -125,6 +125,8 @@ namespace CSVRender
 
         float getSumOfAlteredAndTrueHeight(int cellX, int cellY, int inCellX, int inCellY);
 
+        std::optional<float> getOriginalHeight(int cellX, int cellY, int inCellX, int inCellY);
+
         float* getAlteredHeight(int inCellX, int inCellY);
 
         void resetAlteredHeights();

apps/opencs/view/render/pagedworldspacewidget.cpp

@@ -824,6 +824,30 @@ CSVRender::Cell* CSVRender::PagedWorldspaceWidget::getCell(const CSMWorld::CellC
         return nullptr;
 }
 
+void CSVRender::PagedWorldspaceWidget::setCellAlteredAbsoluteHeight(
+    const CSMWorld::CellCoordinates& coords, int inCellX, int inCellY, float absoluteHeight)
+{
+    std::map<CSMWorld::CellCoordinates, Cell*>::iterator searchResult = mCells.find(coords);
+    if (searchResult != mCells.end())
+    {
+        std::optional<float> baseHeight
+            = searchResult->second->getOriginalHeight(coords.getX(), coords.getY(), inCellX, inCellY);
+        if (baseHeight)
+            searchResult->second->setAlteredHeight(inCellX, inCellY, absoluteHeight - *baseHeight);
+    }
+}
+
+std::optional<float> CSVRender::PagedWorldspaceWidget::getCellOriginalHeight(
+    const CSMWorld::CellCoordinates& coords, int inCellX, int inCellY)
+{
+    std::map<CSMWorld::CellCoordinates, Cell*>::iterator searchResult = mCells.find(coords);
+    if (searchResult != mCells.end())
+    {
+        return searchResult->second->getOriginalHeight(coords.getX(), coords.getY(), inCellX, inCellY);
+    }
+    return {};
+}
+
 void CSVRender::PagedWorldspaceWidget::setCellAlteredHeight(
     const CSMWorld::CellCoordinates& coords, int inCellX, int inCellY, float height)
 {

apps/opencs/view/render/pagedworldspacewidget.hpp

@@ -153,6 +153,11 @@ namespace CSVRender
 
         Cell* getCell(const CSMWorld::CellCoordinates& coords) const override;
 
+        void setCellAlteredAbsoluteHeight(
+            const CSMWorld::CellCoordinates& coords, int inCellX, int inCellY, float absoluteHeight);
+
+        std::optional<float> getCellOriginalHeight(const CSMWorld::CellCoordinates& coords, int inCellX, int inCellY);
+
         void setCellAlteredHeight(const CSMWorld::CellCoordinates& coords, int inCellX, int inCellY, float height);
 
         float* getCellAlteredHeight(const CSMWorld::CellCoordinates& coords, int inCellX, int inCellY);

apps/opencs/view/render/terrainshapemode.cpp

@@ -258,36 +258,13 @@ void CSVRender::TerrainShapeMode::dragWheel(int diff, double speedFactor) {}
 
 void CSVRender::TerrainShapeMode::sortAndLimitAlteredCells()
 {
-    bool passing = false;
-    int passes = 0;
-
     std::sort(mAlteredCells.begin(), mAlteredCells.end());
     mAlteredCells.erase(std::unique(mAlteredCells.begin(), mAlteredCells.end()), mAlteredCells.end());
 
-    while (!passing) // Multiple passes are needed when steepness problems arise for both x and y axis simultaneously
-    {
-        passing = true;
     for (CSMWorld::CellCoordinates cellCoordinates : mAlteredCells)
     {
         limitAlteredHeights(cellCoordinates);
     }
-        std::reverse(mAlteredCells.begin(),
-            mAlteredCells
-                .end()); // Instead of alphabetical order, this should be fixed to sort cells by cell coordinates
-        for (CSMWorld::CellCoordinates cellCoordinates : mAlteredCells)
-        {
-            if (!limitAlteredHeights(cellCoordinates, true))
-                passing = false;
-        }
-        ++passes;
-        if (passes > 2)
-        {
-            Log(Debug::Warning) << "Warning: User edit exceeds accepted slope steepness. Automatic limiting has "
-                                   "failed, edit has been discarded.";
-            clearTransientEdits();
-            return;
-        }
-    }
 }
 
 void CSVRender::TerrainShapeMode::clearTransientEdits()
@@ -590,8 +567,8 @@ void CSVRender::TerrainShapeMode::setFlattenToolTargetHeight(const WorldspaceHit
     mTargetHeight = landShapePointer[inCellY * ESM::Land::LAND_SIZE + inCellX];
 }
 
-void CSVRender::TerrainShapeMode::alterHeight(
-    const CSMWorld::CellCoordinates& cellCoords, int inCellX, int inCellY, float alteredHeight, bool useTool)
+void CSVRender::TerrainShapeMode::alterHeight(const CSMWorld::CellCoordinates& cellCoords, int inCellX, int inCellY,
+    float alteredHeight, bool useTool, bool useAndAlterAdjacentCell)
 {
     std::string cellId = CSMWorld::CellCoordinates::generateId(cellCoords.getX(), cellCoords.getY());
 
@@ -629,9 +606,15 @@ void CSVRender::TerrainShapeMode::alterHeight(
             alteredHeight = *paged->getCellAlteredHeight(cellCoords, inCellX, inCellY) + alteredHeight;
     }
 
-    if (inCellX != 0 && inCellY != 0 && inCellX != ESM::Land::LAND_SIZE - 1 && inCellY != ESM::Land::LAND_SIZE - 1)
+    if ((inCellX != 0 && inCellY != 0 && inCellX != ESM::Land::LAND_SIZE - 1 && inCellY != ESM::Land::LAND_SIZE - 1)
+        || !useAndAlterAdjacentCell)
         paged->setCellAlteredHeight(cellCoords, inCellX, inCellY, alteredHeight);
-
+    else
+    {
+        std::optional<float> originalHeight = paged->getCellOriginalHeight(cellCoords, inCellX, inCellY);
+        if (originalHeight)
+        {
+            float absoluteHeight = *originalHeight + alteredHeight;
             // Change values of cornering cells
             if ((inCellX == 0 && inCellY == 0) && (useTool || isLandLoaded(cellUpLeftId)))
             {
@@ -640,10 +623,11 @@ void CSVRender::TerrainShapeMode::alterHeight(
                 {
                     CSMWorld::CellCoordinates cornerCellCoords = cellCoords.move(-1, -1);
                     if (useTool
-                && std::find(mAlteredCells.begin(), mAlteredCells.end(), cornerCellCoords) == mAlteredCells.end())
+                        && std::find(mAlteredCells.begin(), mAlteredCells.end(), cornerCellCoords)
+                            == mAlteredCells.end())
                         mAlteredCells.emplace_back(cornerCellCoords);
-            paged->setCellAlteredHeight(
-                cornerCellCoords, ESM::Land::LAND_SIZE - 1, ESM::Land::LAND_SIZE - 1, alteredHeight);
+                    paged->setCellAlteredAbsoluteHeight(
+                        cornerCellCoords, ESM::Land::LAND_SIZE - 1, ESM::Land::LAND_SIZE - 1, absoluteHeight);
                 }
                 else
                     return;
@@ -655,9 +639,10 @@ void CSVRender::TerrainShapeMode::alterHeight(
                 {
                     CSMWorld::CellCoordinates cornerCellCoords = cellCoords.move(-1, 1);
                     if (useTool
-                && std::find(mAlteredCells.begin(), mAlteredCells.end(), cornerCellCoords) == mAlteredCells.end())
+                        && std::find(mAlteredCells.begin(), mAlteredCells.end(), cornerCellCoords)
+                            == mAlteredCells.end())
                         mAlteredCells.emplace_back(cornerCellCoords);
-            paged->setCellAlteredHeight(cornerCellCoords, ESM::Land::LAND_SIZE - 1, 0, alteredHeight);
+                    paged->setCellAlteredAbsoluteHeight(cornerCellCoords, ESM::Land::LAND_SIZE - 1, 0, absoluteHeight);
                 }
                 else
                     return;
@@ -669,9 +654,10 @@ void CSVRender::TerrainShapeMode::alterHeight(
                 {
                     CSMWorld::CellCoordinates cornerCellCoords = cellCoords.move(1, -1);
                     if (useTool
-                && std::find(mAlteredCells.begin(), mAlteredCells.end(), cornerCellCoords) == mAlteredCells.end())
+                        && std::find(mAlteredCells.begin(), mAlteredCells.end(), cornerCellCoords)
+                            == mAlteredCells.end())
                         mAlteredCells.emplace_back(cornerCellCoords);
-            paged->setCellAlteredHeight(cornerCellCoords, 0, ESM::Land::LAND_SIZE - 1, alteredHeight);
+                    paged->setCellAlteredAbsoluteHeight(cornerCellCoords, 0, ESM::Land::LAND_SIZE - 1, absoluteHeight);
                 }
                 else
                     return;
@@ -684,9 +670,10 @@ void CSVRender::TerrainShapeMode::alterHeight(
                 {
                     CSMWorld::CellCoordinates cornerCellCoords = cellCoords.move(1, 1);
                     if (useTool
-                && std::find(mAlteredCells.begin(), mAlteredCells.end(), cornerCellCoords) == mAlteredCells.end())
+                        && std::find(mAlteredCells.begin(), mAlteredCells.end(), cornerCellCoords)
+                            == mAlteredCells.end())
                         mAlteredCells.emplace_back(cornerCellCoords);
-            paged->setCellAlteredHeight(cornerCellCoords, 0, 0, alteredHeight);
+                    paged->setCellAlteredAbsoluteHeight(cornerCellCoords, 0, 0, absoluteHeight);
                 }
                 else
                     return;
@@ -698,10 +685,12 @@ void CSVRender::TerrainShapeMode::alterHeight(
                 if (allowLandShapeEditing(cellLeftId, useTool))
                 {
                     CSMWorld::CellCoordinates edgeCellCoords = cellCoords.move(-1, 0);
-            if (useTool && std::find(mAlteredCells.begin(), mAlteredCells.end(), edgeCellCoords) == mAlteredCells.end())
+                    if (useTool
+                        && std::find(mAlteredCells.begin(), mAlteredCells.end(), edgeCellCoords) == mAlteredCells.end())
                         mAlteredCells.emplace_back(edgeCellCoords);
                     paged->setCellAlteredHeight(cellCoords, inCellX, inCellY, alteredHeight);
-            paged->setCellAlteredHeight(edgeCellCoords, ESM::Land::LAND_SIZE - 1, inCellY, alteredHeight);
+                    paged->setCellAlteredAbsoluteHeight(
+                        edgeCellCoords, ESM::Land::LAND_SIZE - 1, inCellY, absoluteHeight);
                 }
             }
             if ((inCellY == 0) && (useTool || isLandLoaded(cellUpId)))
@@ -709,10 +698,12 @@ void CSVRender::TerrainShapeMode::alterHeight(
                 if (allowLandShapeEditing(cellUpId, useTool))
                 {
                     CSMWorld::CellCoordinates edgeCellCoords = cellCoords.move(0, -1);
-            if (useTool && std::find(mAlteredCells.begin(), mAlteredCells.end(), edgeCellCoords) == mAlteredCells.end())
+                    if (useTool
+                        && std::find(mAlteredCells.begin(), mAlteredCells.end(), edgeCellCoords) == mAlteredCells.end())
                         mAlteredCells.emplace_back(edgeCellCoords);
                     paged->setCellAlteredHeight(cellCoords, inCellX, inCellY, alteredHeight);
-            paged->setCellAlteredHeight(edgeCellCoords, inCellX, ESM::Land::LAND_SIZE - 1, alteredHeight);
+                    paged->setCellAlteredAbsoluteHeight(
+                        edgeCellCoords, inCellX, ESM::Land::LAND_SIZE - 1, absoluteHeight);
                 }
             }
 
@@ -721,10 +712,11 @@ void CSVRender::TerrainShapeMode::alterHeight(
                 if (allowLandShapeEditing(cellRightId, useTool))
                 {
                     CSMWorld::CellCoordinates edgeCellCoords = cellCoords.move(1, 0);
-            if (useTool && std::find(mAlteredCells.begin(), mAlteredCells.end(), edgeCellCoords) == mAlteredCells.end())
+                    if (useTool
+                        && std::find(mAlteredCells.begin(), mAlteredCells.end(), edgeCellCoords) == mAlteredCells.end())
                         mAlteredCells.emplace_back(edgeCellCoords);
                     paged->setCellAlteredHeight(cellCoords, inCellX, inCellY, alteredHeight);
-            paged->setCellAlteredHeight(edgeCellCoords, 0, inCellY, alteredHeight);
+                    paged->setCellAlteredAbsoluteHeight(edgeCellCoords, 0, inCellY, absoluteHeight);
                 }
             }
             if ((inCellY == ESM::Land::LAND_SIZE - 1) && (useTool || isLandLoaded(cellDownId)))
@@ -732,10 +724,13 @@ void CSVRender::TerrainShapeMode::alterHeight(
                 if (allowLandShapeEditing(cellDownId, useTool))
                 {
                     CSMWorld::CellCoordinates edgeCellCoords = cellCoords.move(0, 1);
-            if (useTool && std::find(mAlteredCells.begin(), mAlteredCells.end(), edgeCellCoords) == mAlteredCells.end())
+                    if (useTool
+                        && std::find(mAlteredCells.begin(), mAlteredCells.end(), edgeCellCoords) == mAlteredCells.end())
                         mAlteredCells.emplace_back(edgeCellCoords);
                     paged->setCellAlteredHeight(cellCoords, inCellX, inCellY, alteredHeight);
-            paged->setCellAlteredHeight(edgeCellCoords, inCellX, 0, alteredHeight);
+                    paged->setCellAlteredAbsoluteHeight(edgeCellCoords, inCellX, 0, absoluteHeight);
+                }
+            }
         }
     }
 }
@@ -966,70 +961,6 @@ void CSVRender::TerrainShapeMode::updateKeyHeightValues(const CSMWorld::CellCoor
             *rightHeight = *thisHeight;
             *downHeight = *thisHeight;
 
-            // If at edge, get values from neighboring cell
-            if (inCellX == 0)
-            {
-                if (isLandLoaded(cellLeftId))
-                {
-                    const CSMWorld::LandHeightsColumn::DataType landLeftShapePointer
-                        = landTable.data(landTable.getModelIndex(cellLeftId, landshapeColumn))
-                              .value<CSMWorld::LandHeightsColumn::DataType>();
-                    *leftHeight = landLeftShapePointer[inCellY * ESM::Land::LAND_SIZE + (ESM::Land::LAND_SIZE - 2)];
-                    if (paged->getCellAlteredHeight(cellCoords.move(-1, 0), ESM::Land::LAND_SIZE - 2, inCellY))
-                    {
-                        *leftAlteredHeight
-                            = *paged->getCellAlteredHeight(cellCoords.move(-1, 0), ESM::Land::LAND_SIZE - 2, inCellY);
-                        *leftHeight += *leftAlteredHeight;
-                    }
-                }
-            }
-            if (inCellY == 0)
-            {
-                if (isLandLoaded(cellUpId))
-                {
-                    const CSMWorld::LandHeightsColumn::DataType landUpShapePointer
-                        = landTable.data(landTable.getModelIndex(cellUpId, landshapeColumn))
-                              .value<CSMWorld::LandHeightsColumn::DataType>();
-                    *upHeight = landUpShapePointer[(ESM::Land::LAND_SIZE - 2) * ESM::Land::LAND_SIZE + inCellX];
-                    if (paged->getCellAlteredHeight(cellCoords.move(0, -1), inCellX, ESM::Land::LAND_SIZE - 2))
-                    {
-                        *upAlteredHeight
-                            = *paged->getCellAlteredHeight(cellCoords.move(0, -1), inCellX, ESM::Land::LAND_SIZE - 2);
-                        *upHeight += *upAlteredHeight;
-                    }
-                }
-            }
-            if (inCellX == ESM::Land::LAND_SIZE - 1)
-            {
-                if (isLandLoaded(cellRightId))
-                {
-                    const CSMWorld::LandHeightsColumn::DataType landRightShapePointer
-                        = landTable.data(landTable.getModelIndex(cellRightId, landshapeColumn))
-                              .value<CSMWorld::LandHeightsColumn::DataType>();
-                    *rightHeight = landRightShapePointer[inCellY * ESM::Land::LAND_SIZE + 1];
-                    if (paged->getCellAlteredHeight(cellCoords.move(1, 0), 1, inCellY))
-                    {
-                        *rightAlteredHeight = *paged->getCellAlteredHeight(cellCoords.move(1, 0), 1, inCellY);
-                        *rightHeight += *rightAlteredHeight;
-                    }
-                }
-            }
-            if (inCellY == ESM::Land::LAND_SIZE - 1)
-            {
-                if (isLandLoaded(cellDownId))
-                {
-                    const CSMWorld::LandHeightsColumn::DataType landDownShapePointer
-                        = landTable.data(landTable.getModelIndex(cellDownId, landshapeColumn))
-                              .value<CSMWorld::LandHeightsColumn::DataType>();
-                    *downHeight = landDownShapePointer[ESM::Land::LAND_SIZE + inCellX];
-                    if (paged->getCellAlteredHeight(cellCoords.move(0, 1), inCellX, 1))
-                    {
-                        *downAlteredHeight = *paged->getCellAlteredHeight(cellCoords.move(0, 1), inCellX, 1);
-                        *downHeight += *downAlteredHeight;
-                    }
-                }
-            }
-
             // If not at edge, get values from the same cell
             if (inCellX != 0)
             {
@@ -1063,38 +994,7 @@ void CSVRender::TerrainShapeMode::updateKeyHeightValues(const CSMWorld::CellCoor
     }
 }
 
-void CSVRender::TerrainShapeMode::compareAndLimit(const CSMWorld::CellCoordinates& cellCoords, int inCellX, int inCellY,
-    float* limitedAlteredHeightXAxis, float* limitedAlteredHeightYAxis, bool* steepnessIsWithinLimits)
-{
-    if (limitedAlteredHeightXAxis)
-    {
-        if (limitedAlteredHeightYAxis)
-        {
-            if (std::abs(*limitedAlteredHeightXAxis) >= std::abs(*limitedAlteredHeightYAxis))
-            {
-                alterHeight(cellCoords, inCellX, inCellY, *limitedAlteredHeightXAxis, false);
-                *steepnessIsWithinLimits = false;
-            }
-            else
-            {
-                alterHeight(cellCoords, inCellX, inCellY, *limitedAlteredHeightYAxis, false);
-                *steepnessIsWithinLimits = false;
-            }
-        }
-        else
-        {
-            alterHeight(cellCoords, inCellX, inCellY, *limitedAlteredHeightXAxis, false);
-            *steepnessIsWithinLimits = false;
-        }
-    }
-    else if (limitedAlteredHeightYAxis)
-    {
-        alterHeight(cellCoords, inCellX, inCellY, *limitedAlteredHeightYAxis, false);
-        *steepnessIsWithinLimits = false;
-    }
-}
-
-bool CSVRender::TerrainShapeMode::limitAlteredHeights(const CSMWorld::CellCoordinates& cellCoords, bool reverseMode)
+void CSVRender::TerrainShapeMode::limitAlteredHeights(const CSMWorld::CellCoordinates& cellCoords)
 {
     CSMDoc::Document& document = getWorldspaceWidget().getDocument();
     CSMWorld::IdTable& landTable
@@ -1104,7 +1004,6 @@ bool CSVRender::TerrainShapeMode::limitAlteredHeights(const CSMWorld::CellCoordi
     std::string cellId = CSMWorld::CellCoordinates::generateId(cellCoords.getX(), cellCoords.getY());
 
     int limitHeightChange = 1016.0f; // Limited by save format
-    bool steepnessIsWithinLimits = true;
 
     if (isLandLoaded(cellId))
     {
@@ -1123,27 +1022,18 @@ bool CSVRender::TerrainShapeMode::limitAlteredHeights(const CSMWorld::CellCoordi
         float downHeight = 0.0f;
         float downAlteredHeight = 0.0f;
 
-        if (!reverseMode)
-        {
         for (int inCellY = 0; inCellY < ESM::Land::LAND_SIZE; ++inCellY)
         {
             for (int inCellX = 0; inCellX < ESM::Land::LAND_SIZE; ++inCellX)
             {
-                    std::unique_ptr<float> limitedAlteredHeightXAxis(nullptr);
-                    std::unique_ptr<float> limitedAlteredHeightYAxis(nullptr);
                 updateKeyHeightValues(cellCoords, inCellX, inCellY, &thisHeight, &thisAlteredHeight, &leftHeight,
                     &leftAlteredHeight, &upHeight, &upAlteredHeight, &rightHeight, &rightAlteredHeight, &downHeight,
                     &downAlteredHeight);
 
-                    // Check for height limits on x-axis
-                    if (leftHeight - thisHeight > limitHeightChange)
-                        limitedAlteredHeightXAxis = std::make_unique<float>(
-                            leftHeight - limitHeightChange - (thisHeight - thisAlteredHeight));
-                    else if (leftHeight - thisHeight < -limitHeightChange)
-                        limitedAlteredHeightXAxis = std::make_unique<float>(
-                            leftHeight + limitHeightChange - (thisHeight - thisAlteredHeight));
-
+                if (inCellX == 0)
+                {
                     // Check for height limits on y-axis
+                    std::unique_ptr<float> limitedAlteredHeightYAxis(nullptr);
                     if (upHeight - thisHeight > limitHeightChange)
                         limitedAlteredHeightYAxis
                             = std::make_unique<float>(upHeight - limitHeightChange - (thisHeight - thisAlteredHeight));
@@ -1151,49 +1041,26 @@ bool CSVRender::TerrainShapeMode::limitAlteredHeights(const CSMWorld::CellCoordi
                         limitedAlteredHeightYAxis
                             = std::make_unique<float>(upHeight + limitHeightChange - (thisHeight - thisAlteredHeight));
 
-                    // Limit altered height value based on x or y, whichever is the smallest
-                    compareAndLimit(cellCoords, inCellX, inCellY, limitedAlteredHeightXAxis.get(),
-                        limitedAlteredHeightYAxis.get(), &steepnessIsWithinLimits);
+                    if (limitedAlteredHeightYAxis)
+                        alterHeight(cellCoords, inCellX, inCellY, *limitedAlteredHeightYAxis, false, false);
                 }
-            }
-        }
-
-        if (reverseMode)
+                else
                 {
-            for (int inCellY = ESM::Land::LAND_SIZE - 1; inCellY >= 0; --inCellY)
-            {
-                for (int inCellX = ESM::Land::LAND_SIZE - 1; inCellX >= 0; --inCellX)
-                {
-                    std::unique_ptr<float> limitedAlteredHeightXAxis(nullptr);
-                    std::unique_ptr<float> limitedAlteredHeightYAxis(nullptr);
-                    updateKeyHeightValues(cellCoords, inCellX, inCellY, &thisHeight, &thisAlteredHeight, &leftHeight,
-                        &leftAlteredHeight, &upHeight, &upAlteredHeight, &rightHeight, &rightAlteredHeight, &downHeight,
-                        &downAlteredHeight);
-
                     // Check for height limits on x-axis
-                    if (rightHeight - thisHeight > limitHeightChange)
+                    std::unique_ptr<float> limitedAlteredHeightXAxis(nullptr);
+                    if (leftHeight - thisHeight > limitHeightChange)
                         limitedAlteredHeightXAxis = std::make_unique<float>(
-                            rightHeight - limitHeightChange - (thisHeight - thisAlteredHeight));
-                    else if (rightHeight - thisHeight < -limitHeightChange)
+                            leftHeight - limitHeightChange - (thisHeight - thisAlteredHeight));
+                    else if (leftHeight - thisHeight < -limitHeightChange)
                         limitedAlteredHeightXAxis = std::make_unique<float>(
-                            rightHeight + limitHeightChange - (thisHeight - thisAlteredHeight));
+                            leftHeight + limitHeightChange - (thisHeight - thisAlteredHeight));
 
-                    // Check for height limits on y-axis
-                    if (downHeight - thisHeight > limitHeightChange)
-                        limitedAlteredHeightYAxis = std::make_unique<float>(
-                            downHeight - limitHeightChange - (thisHeight - thisAlteredHeight));
-                    else if (downHeight - thisHeight < -limitHeightChange)
-                        limitedAlteredHeightYAxis = std::make_unique<float>(
-                            downHeight + limitHeightChange - (thisHeight - thisAlteredHeight));
-
-                    // Limit altered height value based on x or y, whichever is the smallest
-                    compareAndLimit(cellCoords, inCellX, inCellY, limitedAlteredHeightXAxis.get(),
-                        limitedAlteredHeightYAxis.get(), &steepnessIsWithinLimits);
+                    if (limitedAlteredHeightXAxis)
+                        alterHeight(cellCoords, inCellX, inCellY, *limitedAlteredHeightXAxis, false, false);
                 }
             }
         }
     }
-    return steepnessIsWithinLimits;
 }
 
 bool CSVRender::TerrainShapeMode::isInCellSelection(int globalSelectionX, int globalSelectionY)

apps/opencs/view/render/terrainshapemode.hpp

@@ -137,7 +137,7 @@ namespace CSVRender
 
         /// Do a single height alteration for transient shape edit map
         void alterHeight(const CSMWorld::CellCoordinates& cellCoords, int inCellX, int inCellY, float alteredHeight,
-            bool useTool = true);
+            bool useTool = true, bool useAndAlterAdjacentCell = true);
 
         /// Do a single smoothing height alteration for transient shape edit map
         void smoothHeight(const CSMWorld::CellCoordinates& cellCoords, int inCellX, int inCellY, int toolStrength);
@@ -149,19 +149,15 @@ namespace CSVRender
         /// Do a single equalize alteration for transient shape edit map
         void equalizeHeight(const CSMWorld::CellCoordinates& cellCoords, int inCellX, int inCellY, int targetHeight);
 
-        /// Get altered height values around one vertex
+        /// Get altered height values around one vertex. Default to value of this height for height out of this cell,
+        /// with 0 for altered height.
         void updateKeyHeightValues(const CSMWorld::CellCoordinates& cellCoords, int inCellX, int inCellY,
             float* thisHeight, float* thisAlteredHeight, float* leftHeight, float* leftAlteredHeight, float* upHeight,
             float* upAlteredHeight, float* rightHeight, float* rightAlteredHeight, float* downHeight,
             float* downAlteredHeight);
 
-        /// Limit steepness based on either X or Y and return false if steepness is limited
-        void compareAndLimit(const CSMWorld::CellCoordinates& cellCoords, int inCellX, int inCellY,
-            float* limitedAlteredHeightXAxis, float* limitedAlteredHeightYAxis, bool* steepnessIsWithinLimits);
-
-        /// Check that the edit doesn't break save format limits, fix if necessary, return true if slope steepness is
-        /// within limits
-        bool limitAlteredHeights(const CSMWorld::CellCoordinates& cellCoords, bool reverseMode = false);
+        /// Check that the edit doesn't break save format limits, fix if necessary
+        void limitAlteredHeights(const CSMWorld::CellCoordinates& cellCoords);
 
         /// Check if global selection coordinate belongs to cell in view
         bool isInCellSelection(int globalSelectionX, int globalSelectionY);

apps/opencs/view/render/terrainstorage.cpp

@@ -59,16 +59,21 @@ namespace CSVRender
 
     float TerrainStorage::getSumOfAlteredAndTrueHeight(int cellX, int cellY, int inCellX, int inCellY)
     {
-        float height = 0.f;
+        std::optional<float> true_height = getOriginalHeight(cellX, cellY, inCellX, inCellY);
+        if (true_height)
+            return *true_height + *getAlteredHeight(inCellX, inCellY);
+        return 0.0f;
+    }
 
+    std::optional<float> TerrainStorage::getOriginalHeight(int cellX, int cellY, int inCellX, int inCellY)
+    {
         const int index
             = mData.getLand().searchId(ESM::RefId::stringRefId(CSMWorld::Land::createUniqueRecordId(cellX, cellY)));
         if (index == -1) // no land!
-            return height;
+            return {};
 
         const ESM::Land::LandData* landData = mData.getLand().getRecord(index).get().getLandData(ESM::Land::DATA_VHGT);
-        height = landData->mHeights[inCellY * ESM::Land::LAND_SIZE + inCellX];
-        return mAlteredHeight[inCellY * ESM::Land::LAND_SIZE + inCellX] + height;
+        return landData->mHeights[inCellY * ESM::Land::LAND_SIZE + inCellX];
     }
 
     float* TerrainStorage::getAlteredHeight(int inCellX, int inCellY)
@@ -102,14 +107,14 @@ namespace CSVRender
 
     int TerrainStorage::getUpHeight(int col, int row, std::span<const float> heightData) const
     {
-        return heightData[(col - 1) * ESM::Land::LAND_SIZE + row]
-            + mAlteredHeight[static_cast<unsigned int>((col - 1) * ESM::Land::LAND_SIZE + row)];
+        return heightData[(col + 1) * ESM::Land::LAND_SIZE + row]
+            + mAlteredHeight[static_cast<unsigned int>((col + 1) * ESM::Land::LAND_SIZE + row)];
     }
 
     int TerrainStorage::getDownHeight(int col, int row, std::span<const float> heightData) const
     {
-        return heightData[(col + 1) * ESM::Land::LAND_SIZE + row]
-            + mAlteredHeight[static_cast<unsigned int>((col + 1) * ESM::Land::LAND_SIZE + row)];
+        return heightData[(col - 1) * ESM::Land::LAND_SIZE + row]
+            + mAlteredHeight[static_cast<unsigned int>((col - 1) * ESM::Land::LAND_SIZE + row)];
     }
 
     int TerrainStorage::getHeightDifferenceToLeft(int col, int row, std::span<const float> heightData) const
@@ -132,29 +137,19 @@ namespace CSVRender
         return abs(getThisHeight(col, row, heightData) - getDownHeight(col, row, heightData));
     }
 
-    bool TerrainStorage::leftOrUpIsOverTheLimit(
-        int col, int row, int heightWarningLimit, std::span<const float> heightData) const
-    {
-        return getHeightDifferenceToLeft(col, row, heightData) >= heightWarningLimit
-            || getHeightDifferenceToUp(col, row, heightData) >= heightWarningLimit;
-    }
-
-    bool TerrainStorage::rightOrDownIsOverTheLimit(
-        int col, int row, int heightWarningLimit, std::span<const float> heightData) const
-    {
-        return getHeightDifferenceToRight(col, row, heightData) >= heightWarningLimit
-            || getHeightDifferenceToDown(col, row, heightData) >= heightWarningLimit;
-    }
-
     void TerrainStorage::adjustColor(int col, int row, const ESM::LandData* heightData, osg::Vec4ub& color) const
     {
         if (!heightData)
             return;
         // Highlight broken height changes
         int heightWarningLimit = 1024;
-        if (((col > 0 && row > 0) && leftOrUpIsOverTheLimit(col, row, heightWarningLimit, heightData->getHeights()))
-            || ((col < ESM::Land::LAND_SIZE - 1 && row < ESM::Land::LAND_SIZE - 1)
-                && rightOrDownIsOverTheLimit(col, row, heightWarningLimit, heightData->getHeights())))
+        if ((row > 0 && (getHeightDifferenceToRight(col, row, heightData->getHeights()) >= heightWarningLimit))
+            || (row > 0 && row < ESM::Land::LAND_SIZE
+                && (getHeightDifferenceToLeft(col, row, heightData->getHeights()) >= heightWarningLimit))
+            || (row == 0 && col > 0
+                && (getHeightDifferenceToDown(col, row, heightData->getHeights()) >= heightWarningLimit))
+            || (row == 0 && col < ESM::Land::LAND_SIZE
+                && (getHeightDifferenceToUp(col, row, heightData->getHeights()) >= heightWarningLimit)))
         {
             color.r() = 255;
             color.g() = 0;

apps/opencs/view/render/terrainstorage.hpp

@@ -31,6 +31,7 @@ namespace CSVRender
 
         bool useAlteration() const override { return true; }
         float getSumOfAlteredAndTrueHeight(int cellX, int cellY, int inCellX, int inCellY);
+        std::optional<float> getOriginalHeight(int cellX, int cellY, int inCellX, int inCellY);
         float* getAlteredHeight(int inCellX, int inCellY);
 
     private:
@@ -51,9 +52,6 @@ namespace CSVRender
         int getHeightDifferenceToRight(int col, int row, std::span<const float> heightData) const;
         int getHeightDifferenceToUp(int col, int row, std::span<const float> heightData) const;
         int getHeightDifferenceToDown(int col, int row, std::span<const float> heightData) const;
-        bool leftOrUpIsOverTheLimit(int col, int row, int heightWarningLimit, std::span<const float> heightData) const;
-        bool rightOrDownIsOverTheLimit(
-            int col, int row, int heightWarningLimit, std::span<const float> heightData) const;
 
         void adjustColor(int col, int row, const ESM::LandData* heightData, osg::Vec4ub& color) const override;
         float getAlteredHeight(int col, int row) const override;