Adding a basic rule-based terrain painting implementation.

http://www.garagegames.com/community/resources/view/17145

Engine/source/gui/worldEditor/terrainEditor.cpp

@@ -2933,3 +2933,74 @@ ConsoleMethod( TerrainEditor, setSlopeLimitMaxAngle, F32, 3, 3, 0)
 	object->mSlopeMaxAngle = angle;
 	return angle;
 }
+
+//------------------------------------------------------------------------------  
+void TerrainEditor::autoMaterialLayer( F32 mMinHeight, F32 mMaxHeight, F32 mMinSlope, F32 mMaxSlope )  
+{  
+    if (!mActiveTerrain)  
+        return;  
+  
+   S32 mat = getPaintMaterialIndex();  
+   if (mat == -1)  
+        return;  
+  
+    mUndoSel = new Selection;  
+          
+    U32 terrBlocks = mActiveTerrain->getBlockSize();  
+    for (U32 y = 0; y < terrBlocks; y++) 
+    {  
+        for (U32 x = 0; x < terrBlocks; x++) 
+        {  
+            // get info  
+            GridPoint gp;  
+            gp.terrainBlock = mActiveTerrain;  
+            gp.gridPos.set(x, y);  
+  
+            GridInfo gi;  
+            getGridInfo(gp, gi);  
+  
+            if (gi.mMaterial == mat)  
+                continue;  
+  
+            Point3F wp;  
+            gridToWorld(gp, wp);  
+  
+            if (!(wp.z >= mMinHeight && wp.z <= mMaxHeight))  
+                continue;  
+  
+            // transform wp to object space  
+            Point3F op;  
+            mActiveTerrain->getWorldTransform().mulP(wp, &op);  
+  
+            Point3F norm;  
+            mActiveTerrain->getNormal(Point2F(op.x, op.y), &norm, true);  
+  
+            if (mMinSlope > 0)  
+                if (norm.z > mSin(mDegToRad(90.0f - mMinSlope)))  
+                    continue;  
+  
+            if (mMaxSlope < 90)  
+                if (norm.z < mSin(mDegToRad(90.0f - mMaxSlope)))  
+                    continue;  
+  
+            gi.mMaterialChanged = true;  
+            mUndoSel->add(gi);  
+            gi.mMaterial = mat;  
+            setGridInfo(gi);  
+        }  
+    }  
+  
+    if(mUndoSel->size())  
+        submitUndo( mUndoSel );  
+    else  
+        delete mUndoSel;  
+  
+    mUndoSel = 0;  
+  
+    scheduleMaterialUpdate();     
+}  
+  
+ConsoleMethod( TerrainEditor, autoMaterialLayer, void, 6, 6, "(float minHeight, float maxHeight, float minSlope, float maxSlope)")  
+{  
+   object->autoMaterialLayer( dAtof(argv[2]), dAtof(argv[3]), dAtof(argv[4]), dAtof(argv[5]) );  
+}  

Engine/source/gui/worldEditor/terrainEditor.h

@@ -230,6 +230,8 @@ class TerrainEditor : public EditTSCtrl
       void submitMaterialUndo( String actionName );
       void onMaterialUndo( TerrainBlock *terr );
 
+      void autoMaterialLayer(F32, F32, F32, F32);
+
 	private:	
 
       typedef EditTSCtrl Parent;