Added better perlin terrain generation

Added function to scatter models onto the terrain

Graphics2/Graphics2.cpp

@@ -15,7 +15,7 @@ void Graphics2::CreateSceneGraph()
 
 	GetCamera()->SetCameraPosition(0.0f, 550.0f, -80.0f);
 	SceneGraphPointer sceneGraph = GetSceneGraph();
-	
+
 	// This is where you add nodes to the scene graph
 	//shared_ptr<TexturedCubeNode> cube = make_shared<TexturedCubeNode>(L"Body", L"Textures\\woodbox.bmp");
 	//cube->SetWorldTransform(XMMatrixScaling(5.0f, 8.0f, 2.5f) *  XMMatrixTranslation(0, 23.0f, 0));
@@ -28,7 +28,7 @@ void Graphics2::CreateSceneGraph()
 	sceneGraph->Add(skyDome);
 	
 	//shared_ptr<HeightMapTerrainNode> terrainNode = make_shared<HeightMapTerrainNode>(L"MainTerrain", L"Textures\\Example_HeightMap.raw", L"RandomWords");
-	shared_ptr<PerlinTerrainNode> terrainNode = make_shared<PerlinTerrainNode>(L"MainTerrain", L"LovelyCat", 10.0f, 20.0f, 1.0f, 1);
+	shared_ptr<PerlinTerrainNode> terrainNode = make_shared<PerlinTerrainNode>(L"MainTerrain", L"LovelyCat", 10.0f);
 	terrainNode->SetAmbientLight(DirectXFramework::GetDXFramework()->GetGlobalLighting()->GetAmbientLight());
 	terrainNode->SetDirectionalLight(DirectXFramework::GetDXFramework()->GetGlobalLighting()->GetDirectionalLightDirection(), DirectXFramework::GetDXFramework()->GetGlobalLighting()->GetDirectionalLightColor());
 	terrainNode->SetWaterColor(XMFLOAT4(SharedMethods::RGBValueToIntensity(0x84), SharedMethods::RGBValueToIntensity(0xC1), SharedMethods::RGBValueToIntensity(0xF9), 1.0f));
@@ -36,26 +36,6 @@ void Graphics2::CreateSceneGraph()
 	//terrainNode->SetWaterColor(XMFLOAT4(0.0f, 0.0f, 1.0f, 1.0f));
 	sceneGraph->Add(terrainNode);
 
-	shared_ptr<SceneGraph> treeGroupA = make_shared<SceneGraph>(L"TreeGroupA");
-
-	shared_ptr<MeshNode> treeNode1 = make_shared<MeshNode>(L"Tree1", L"Models\\Tree\\Tree1.3ds");
-	treeNode1->SetWorldTransform(XMMatrixScaling(0.005f, 0.01f, 0.005f) * XMMatrixRotationAxis(XMVectorSet(1.0f, 0.0f, 1.0f, 0.0f), 0.1f * XM_PI) * XMMatrixTranslation(0.0f, 320.0f, 250.0f));
-	treeGroupA->Add(treeNode1);
-
-	shared_ptr<MeshNode> treeNode2 = make_shared<MeshNode>(L"Tree2", L"Models\\Tree\\Tree1.3ds");
-	treeNode2->SetWorldTransform(XMMatrixScaling(0.002f, 0.002f, 0.002f) * XMMatrixTranslation(-150.0f, 380.0f, 150.0f));
-	treeGroupA->Add(treeNode2);
-
-	shared_ptr<MeshNode> treeNode3 = make_shared<MeshNode>(L"Tree3", L"Models\\Tree\\Tree1.3ds");
-	treeNode3->SetWorldTransform(XMMatrixScaling(0.005f, 0.005f, 0.005f) * XMMatrixRotationAxis(XMVectorSet(1.0f, 0.0f, 1.0f, 0.0f), -0.1f * XM_PI) * XMMatrixTranslation(100.0f, 290.0f, 350.0f));
-	treeGroupA->Add(treeNode3);
-
-	shared_ptr<MeshNode> treeNode4 = make_shared<MeshNode>(L"Tree4", L"Models\\Tree\\Tree1.3ds");
-	treeNode4->SetWorldTransform(XMMatrixScaling(0.005f, 0.01f, 0.005f) * XMMatrixRotationAxis(XMVectorSet(1.0f, 0.0f, 1.0f, 0.0f), 0.1f * XM_PI) * XMMatrixTranslation(0.0f, 320.0f, 250.0f));
-	treeGroupA->Add(treeNode4);
-
-	sceneGraph->Add(treeGroupA);
-
 	shared_ptr<ControlledSplitMeshNode> plane1Node = make_shared<ControlledSplitMeshNode>(L"Plane1", L"Models\\Plane\\Bonanza.3DS");
 	plane1Node->SetStartOrientation(XMMatrixRotationAxis(XMVectorSet(0.0f, 0.0f, 1.0f, 0.0f), XM_PI) * XMMatrixRotationAxis(XMVectorSet(1.0f, 0.0f, 0.0f, 0.0f), 0.5f * XM_PI));
 	plane1Node->SetNodePosition(0.0f, 550.0f, -50.0f);	
@@ -74,9 +54,30 @@ void Graphics2::CreateSceneGraph()
 
 void Graphics2::UpdateSceneGraph()
 {
-	GetCurrentControlInputs();
-
 	SceneGraphPointer sceneGraph = GetSceneGraph();
+	shared_ptr<TerrainNode> mainTerrain = dynamic_pointer_cast<TerrainNode>(sceneGraph->Find(L"MainTerrain"));
+
+	if (!_initDone && mainTerrain != nullptr)
+	{
+		vector<TerrainPopNode> rngSpawnList;
+
+		TerrainPopNode treeModelA = TerrainPopNode();
+		treeModelA.modelName = L"Models\\Tree\\Tree2.fbx";
+		treeModelA.nodeBaseName = L"treeA";
+		treeModelA.scaleFactor = 1.0f;
+
+		rngSpawnList.push_back(treeModelA);
+
+		shared_ptr<SceneGraph> treeGroupA = make_shared<SceneGraph>(L"TreeGroupA");
+
+		mainTerrain->PopulateTerrain(treeGroupA, rngSpawnList, 10, 10, 400.0f, 550.0f, 0.9f, 1.0f);
+		treeGroupA->Initialise();
+		sceneGraph->Add(treeGroupA);
+
+		_initDone = true;
+	}
+
+	GetCurrentControlInputs();
 	XMVECTOR startCameraPos = GetCamera()->GetCameraPosition();
 		
 	if (_currentPlayerObject != nullptr)
@@ -189,8 +190,7 @@ void Graphics2::UpdateSceneGraph()
 	}	
 
 	// Check the camera and our terrain boundaries
-	XMVECTOR currentCameraPos = GetCamera()->GetCameraPosition();
-	shared_ptr<TerrainNode> mainTerrain = dynamic_pointer_cast<TerrainNode>(sceneGraph->Find(L"MainTerrain"));
+	XMVECTOR currentCameraPos = GetCamera()->GetCameraPosition();	
 	GetCamera()->Update();
 	if (mainTerrain != nullptr)
 	{

Graphics2/Graphics2.h

@@ -19,6 +19,8 @@ public:
 	void UpdateSceneGraph();
 
 private:
+	bool _initDone = false;
+
 	bool _boosting = false;
 	float _boostMultiplier = 1;
 	float _boostMin = 1;

Graphics2/Models/Boat/NWW83WKS0AJC0W7C1XP0CFCET.mtl

@@ -0,0 +1,27 @@
+newmtl mat_0-default-grey.jpg
+Ka 0.000000 0.000000 0.000000
+Kd 0.698039 0.698039 0.698039
+Ks 0.000000 0.000000 0.000000
+d 1.000000
+illum 2
+Ns 9.84916
+map_Kd default-grey.jpg
+
+newmtl mat_1-boat_fishing02.jpg
+Ka 0.000000 0.000000 0.000000
+Kd 0.698039 0.698039 0.698039
+Ks 0.000000 0.000000 0.000000
+d 1.000000
+illum 2
+Ns 9.84916
+map_Kd boat_fishing02.jpg
+
+newmtl mat_2-default-grey.jpg
+Ka 0.000000 0.000000 0.000000
+Kd 0.698039 0.698039 0.698039
+Ks 0.000000 0.000000 0.000000
+d 1.000000
+illum 2
+Ns 9.84916
+map_Kd default-grey.jpg
+

Graphics2/PerlinTerrainNode.cpp

@@ -1,11 +1,8 @@
 #include "PerlinTerrainNode.h"
 
-PerlinTerrainNode::PerlinTerrainNode(wstring name, wstring seed, float offsetX, float offsetY, float chunkSize, int layers, int widthX, int widthZ, float waterHeight, int cellSizeX, int cellSizeZ) : TerrainNode(name, seed, waterHeight, widthX, widthZ, cellSizeX, cellSizeZ)
+PerlinTerrainNode::PerlinTerrainNode(wstring name, wstring seed, float chunkSize, int widthX, int widthZ, float waterHeight, int cellSizeX, int cellSizeZ) : TerrainNode(name, seed, waterHeight, widthX, widthZ, cellSizeX, cellSizeZ)
 {	
-	_offsetX = offsetX;
-	_offsetY = offsetY;
 	_chunkSize = chunkSize;
-	_layers = layers;
 
 	GeneratePerlinValues();
 	if (!GeneratePerlinHeights())
@@ -14,44 +11,64 @@ PerlinTerrainNode::PerlinTerrainNode(wstring name, wstring seed, float offsetX,
 	}
 }
 
+void PerlinTerrainNode::GeneratePerlinValues()
+{
+	std::seed_seq seedGenerator(_seedString.begin(), _seedString.end());
+	std::mt19937 generator;
+	generator.seed(seedGenerator);
+	std::uniform_int_distribution<> dist(0, 511);
+	char bufferChar;
+	int newPosition;
+
+	_p.clear();
+	copy(_staticP.begin(), _staticP.end(), back_inserter(_p));
+
+	for (int i = 0; i < 512; i++)
+	{
+		newPosition = dist(generator);
+		bufferChar = _p[i];
+		_p[i] = _p[newPosition];
+		_p[newPosition] = bufferChar;
+	}
+}
+
 // Method for filling the height values array for the terrain generation
 bool PerlinTerrainNode::GeneratePerlinHeights()
 {	
 	for (int z = 0; z < _gridRows; z++)
 	{
-		float mapZ = ((float)z / (float)_gridRows) + 0.5f;
+		float mapZ = ((float)z / (float)_gridRows);
 
 		for (int x = 0; x < _gridCols; x++)
 		{
-			float mapX = ((float)x / (float)_gridCols) + 0.5f;
+			float mapX = ((float)x / (float)_gridCols);
 			
-			float currentHeightValue = GetPerlinValueAt(_offsetX + mapX, _offsetY + mapZ, 8, 0.85f) - 0.25f;
+			//float currentHeightValue = GetPerlinValueAt(mapX, mapZ, 8, 0.85f) - 0.25f;
+			float currentHeightValue = 0.0f;
+			
+			int octaves = 12;
+			float currentOctaveValue = 1.0f;
+			float stepOff = 1.0f;
+			float stepTotal = 0.0f;
+			// n covers the persistance, frequency and 
+			for (int n = 1; n <= octaves; n++)
+			{
+				currentHeightValue += stepOff * GetNoiseValueAt(((float)x * currentOctaveValue) / ((float)_gridCols / _chunkSize), ((float)z * currentOctaveValue) / ((float)_gridRows / _chunkSize));
+				currentOctaveValue *= 2;
+				stepTotal += stepOff;
+				stepOff *=  0.5f;
+
+			}
+
+			//currentHeightValue = currentHeightValue / stepTotal; // *(currentHeightValue * 2.0f);
 			//currentHeightValue = currentHeightValue - floor(currentHeightValue);
-			_heightValues.push_back(currentHeightValue);
+			_heightValues.push_back((currentHeightValue + 1.0f) * 0.5f);
 		}
 	}
 
 	return true;
 }
 
-// Method for generating the permutation array needed for perlin noise
-void PerlinTerrainNode::GeneratePerlinValues()
-{
-	// Set the permutation array length
-	p.resize(256);
-
-	// Fill the permutation array with 0 to 255
-	iota(p.begin(), p.end(), 0);
-	
-	default_random_engine engine(_seedHash);
-
-	// Shuffle the array values using the seed value given
-	shuffle(p.begin(), p.end(), engine);
-
-	// Duplicate the permutation results so our array is 512
-	p.insert(p.end(), p.begin(), p.end());
-}
-
 float PerlinTerrainNode::Fade(float t)
 {
 	return t * t * t * (t * (t * 6 - 15) + 10);
@@ -59,77 +76,56 @@ float PerlinTerrainNode::Fade(float t)
 
 float PerlinTerrainNode::Grad(int hash, float x, float y)
 {
-	// Fast Grad switch check converted from a java implimentation of perlin noise
-	switch (hash & 0xF)
+	int h = hash & 7;
+	float u = y;
+	float v = x;
+	if (h < 4)
 	{
-	case 0x0: return x;
-	case 0x1: return x + y;
-	case 0x2: return y;
-	case 0x3: return -x + y;
-	case 0x4: return -x;
-	case 0x5: return -x - y;
-	case 0x6: return -y;
-	case 0x7: return x - y;
-	case 0x8: return x;
-	case 0x9: return x + y;
-	case 0xA: return y;
-	case 0xB: return -x + y;
-	case 0xC: return -x;
-	case 0xD: return -x - y;
-	case 0xE: return -y;
-	case 0xF: return x - y;
-
-	default: return 0; // Never occurs
+		u = x;
+		v = y;
 	}
-}
-
-// Method to calculate the perlin value at x/y with the given octaves and persistance values, also normalised
-float PerlinTerrainNode::GetPerlinValueAt(float x, float y, int octaves, float persistance)
-{
-	float total = 0.0f;
-	float frequency = 1.0f;
-	float amplitude = 1.0f;
-	float maxValue = 0.0f;
-
-	for (int i = 0; i < octaves; i++)
+	
+	float outA = u;
+	if ((h & 1))
 	{
-		total += (GetNoiseValueAt(x * frequency, y * frequency) * amplitude);
-		maxValue += amplitude;
-
-		amplitude *= persistance;
-		frequency *= 2;
+		outA = -u;
 	}
 
-	return total / maxValue;
+	float outB = 2.0f * v;
+	if ((h & 2))
+	{
+		outB = -2.0f * v;
+	}
+
+	return outA + outB;
 }
 
 // Method to get the perlin noise value at x/y
 float PerlinTerrainNode::GetNoiseValueAt(float x, float y)
 {
-	int x0 = (int)x & 255;
-	int y0 = (int)y & 255;
+	int ix0 = (int)floor(x);
+	int iy0 = (int)floor(y);
 
-	int x1 = x0 + 1;
-	int y1 = y0 + 1;
+	float fx0 = x - (float)ix0;
+	float fy0 = y - (float)iy0;
+	float fx1 = fx0 - 1.0f;
+	float fy1 = fy0 - 1.0f;
+	
+	int ix1 = (ix0 + 1) & 0xff;
+	int iy1 = (iy0 + 1) & 0xff;
+	ix0 = ix0 & 0xff;
+	iy0 = iy0 & 0xff;
 
-	float dx = x - (float)x0;
-	float dy = y - (float)y0;
+	float t = Fade(fy0);
+	float s = Fade(fx0);
 
-	float u = Fade(dx);
-	float v = Fade(dy);
+	float nx0 = Grad(_p[ix0 + _p[iy0]], fx0, fy0);
+	float nx1 = Grad(_p[ix0 + _p[iy1]], fx0, fy1);
+	float n0 = SharedMethods::Lerp<float>(nx0, nx1, t);
 
-	int aa = p[p[x0] + y0];
-	int ab = p[p[x0] + y1];	
-	int ba = p[p[x1] + y0];
-	int bb = p[p[x1] + y1];
+	nx0 = Grad(_p[ix1 + _p[iy0]], fx1, fy0);
+	nx1 = Grad(_p[ix1 + _p[iy1]], fx1, fy1);
+	float n1 = SharedMethods::Lerp<float>(nx0, nx1, t);
 
-	float na0 = Grad(aa, dx, dy);
-	float na1 = Grad(ba, dx - 1.0f, dy);
-	float nal = SharedMethods::Lerp(na0, na1, u);
-
-	float nb0 = Grad(ab, dx, dy - 1.0f);
-	float nb1 = Grad(bb, dx - 1.0f, dy - 1.0f);
-	float nbl = SharedMethods::Lerp(nb0, nb1, u);
-
-	return (SharedMethods::Lerp(nal, nbl, v) + 1.0f) / 2.0f;
+	return 0.507f * SharedMethods::Lerp(n0, n1, s);
 }

Graphics2/PerlinTerrainNode.h

@@ -9,21 +9,48 @@
 class PerlinTerrainNode : public TerrainNode
 {
 public:
-	PerlinTerrainNode(wstring name, wstring seed, float offsetX, float offsetY, float chunkSize, int layers, int widthX = 1023, int widthZ = 1023, float waterHeight = 150.0f, int cellSizeX = 10, int cellSizeZ = 10);
+	PerlinTerrainNode(wstring name, wstring seed, float chunkSize, int widthX = 1023, int widthZ = 1023, float waterHeight = 300.0f, int cellSizeX = 10, int cellSizeZ = 10);
 
 private:
-	vector<int> p;
-	float _offsetX;
-	float _offsetY;
+	// the static perlin permutation array, we could calculate a random one but apparently you can run into sequencing issues and this just seems like the best solution
+	vector<unsigned char> _staticP = { 151,160,137,91,90,15,
+  131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,
+  190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,
+  88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,
+  77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,
+  102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,
+  135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,
+  5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,
+  223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,
+  129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,
+  251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,
+  49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,
+  138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180,
+  151,160,137,91,90,15,
+  131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,
+  190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,
+  88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,
+  77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,
+  102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,
+  135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,
+  5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,
+  223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,
+  129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,
+  251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,
+  49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,
+  138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180
+	};
+
+	vector<unsigned char> _p;
+	
 	float _chunkSize;
-	int _layers;
 
 	float Fade(float t);
 	float Grad(int hash, float x, float y);
 
+	void GeneratePerlinValues();
 	bool GeneratePerlinHeights();
 	float GetPerlinValueAt(float x, float y, int octaves, float persistance);
 	float GetNoiseValueAt(float x, float y);
-	void GeneratePerlinValues();
 };
 

Graphics2/SharedMethods.h

@@ -1,5 +1,6 @@
 #pragma once
 #include "DirectXCore.h"
+#include <string>
 
 struct CBUFFER
 {
@@ -16,6 +17,13 @@ struct CBUFFER
 	float       padding[2];
 };
 
+struct TerrainPopNode
+{
+	std::wstring nodeBaseName;
+	std::wstring modelName;				
+	float scaleFactor;
+};
+
 namespace SharedMethods
 {
 	XMMATRIX RotateFromPoint(const float x, const float y, const float z, const XMMATRIX rotationMatrix);

Graphics2/TerrainNode.cpp

@@ -498,6 +498,52 @@ void TerrainNode::LoadTerrainTextures()
 	));
 }
 
+void TerrainNode::PopulateTerrain(SceneGraphPointer currentSceneGraph, vector<TerrainPopNode>& nodesForPop, int xStep, int zStep, float heightLower, float heightUpper, float slopeLower, float slopeUpper)
+{
+	for (int z = 0; z < _gridRows; z += zStep)
+	{
+		for (int x = 0; x < _gridCols; x += xStep)
+		{
+			int currentIndex = ((z * _gridCols) + x) * 4;
+
+			float totalHeights = 0.0f;
+			float totalSlope = 0.0f;
+			for (int si = 0; si < 4; si++)
+			{
+				totalHeights += _terrainVerts[currentIndex + si].Position.y;
+				totalSlope += _terrainVerts[currentIndex + si].Normal.y;
+			}
+
+			float heightValue = totalHeights / 4.0f;
+
+			if (heightValue >= heightLower && heightValue <= heightUpper)
+			{
+				float avgSlope = totalSlope / 4.0f;
+
+				if (avgSlope >= slopeLower && avgSlope <= slopeUpper)
+				{
+					int nodeIndex = 0;
+					if (nodesForPop.size() > 1)
+					{
+						nodeIndex = rand() % nodesForPop.size();
+					}
+
+					float scale = (rand() % 100 * 0.01f) * nodesForPop[nodeIndex].scaleFactor;
+					
+					float xPos = x * _cellSizeX + _terrainStartX;
+					float yPos = heightValue - 1.0f;
+					float zPos = (-z + 1) * _cellSizeZ + _terrainStartZ;
+
+					wstring nodeName = L"_" + to_wstring(z) + L"_" + to_wstring(x);
+					shared_ptr<MeshNode> newNode = make_shared<MeshNode>(nodesForPop[nodeIndex].nodeBaseName + nodeName, nodesForPop[nodeIndex].modelName);
+					newNode->SetWorldTransform(XMMatrixScaling(scale, scale, scale) * XMMatrixTranslation(xPos, yPos, zPos));
+					currentSceneGraph->Add(newNode);
+				}
+			}
+		}
+	}
+}
+
 void TerrainNode::GenerateBlendMap()
 {
 	RGBA snowTops = RGBA{ 0u, 0u, 0u, 255u };
@@ -507,7 +553,13 @@ void TerrainNode::GenerateBlendMap()
 
 	vector<RGBA> colorSteps = {darkDirt, lightDirt, grassLand, grassLand, grassLand, snowTops};
 
-	ColorGradient terrainBlendGradient = ColorGradient(80.0f, 620.0f, colorSteps);
+	float waterOffset = _waterHeight - 50.0f;
+	if (waterOffset < 0.0f)
+	{
+		waterOffset = 0.0f;
+	}
+
+	ColorGradient terrainBlendGradient = ColorGradient(waterOffset, 820.0f, colorSteps);
 
 	// Note that _numberOfRows and _numberOfColumns need to be setup
 	// to the number of rows and columns in your grid in order for this
@@ -538,24 +590,30 @@ void TerrainNode::GenerateBlendMap()
 			int currentIndex = ((i * _gridCols) + j) * 4;
 
 			float totalHeights = 0.0f;
-			float biggestSlope = 0.0f;
+			float totalSlope = 0.0f;
 
 			for (int si = 0; si < 4; si++)
 			{
-				totalHeights += _terrainVerts[currentIndex + si].Position.y;
-				if (_terrainVerts[currentIndex + si].Normal.y > biggestSlope)
-				{
-					biggestSlope = _terrainVerts[currentIndex + si].Normal.y;
-				}
+				totalHeights += _terrainVerts[currentIndex + si].Position.y;				
+				totalSlope += _terrainVerts[currentIndex + si].Normal.y;
 			}
-
+			
 			float avgHeight = totalHeights / 4.0f;
+			float avgSlope = totalSlope / 4.0f;
 
 			RGBA currentBlend = terrainBlendGradient.GetRGBAValue(avgHeight);
 			r = (BYTE)currentBlend.red;
 			g = (BYTE)currentBlend.green;
 			b = (BYTE)currentBlend.blue;
-			a = (BYTE)currentBlend.alpha;
+			a = (BYTE)currentBlend.alpha;			
+			// Override the G channel if we are cliff height and slope angle
+			if (avgHeight > 500.0f)
+			{
+				if (avgSlope < 0.6f)
+				{
+					g = (BYTE)SharedMethods::Clamp<int>(avgHeight - 450.0f, 0, 150);
+				}
+			}				
 
 			DWORD mapValue = (a << 24) + (b << 16) + (g << 8) + r;
 			*blendMapPtr++ = mapValue;

Graphics2/TerrainNode.h

@@ -8,7 +8,9 @@
 #include "WICTextureLoader.h"
 #include "SharedMethods.h"
 #include "SceneNode.h"
-
+#include "SceneGraph.h"
+#include "MeshNode.h"
+#include "SplitMeshNode.h"
 
 typedef struct TerrainVertex
 {
@@ -49,6 +51,8 @@ public:
 	void Render(void);
 	void virtual Shutdown(void);
 
+	void PopulateTerrain(SceneGraphPointer currentSceneGraph, vector<TerrainPopNode>& nodesForPop, int xStep, int zStep, float heightLower, float heightUpper, float slopeLower, float slopeUpper);
+
 	float GetHeightAtPoint(float x, float z, bool waterCollide = false);
 	bool CheckXBoundary(float x);
 	bool CheckZBoundary(float z);