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Grass.cs

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Runtime.Serialization;

using System.Text;

using System.Threading.Tasks;

using LevelEditor.Engine.Helper;

using Microsoft.Xna.Framework;

namespace LevelEditor.Engine

{

public class Grass

{

public const int GrassPatchSize = 4;

public const int GrassPatchInstancesCount = 25;

public class Patch

{

public Vector3 mPosition;

public int mPatchInstancesOffset;

public float mRadius = (float)Math.Sqrt(2.0 * Math.Pow(GrassPatchSize / 2.0, 2.0));

public float mDistance;

public float mSlope;

public bool mRender;

public Patch(Vector3 position, int patchInstancesOffset)

{

mPosition = position;

mPatchInstancesOffset = patchInstancesOffset;

mDistance = 0.0f;

mRender = true;

}

public void Generate(Terrain terrain, GrassInstancing[] instances, Random random)

{

mSlope = terrain.GetSlope(mPosition);

for (var i = 0; i < GrassPatchInstancesCount; i++)

{

var x = 2.0f * (float)random.NextDouble() - 1.0f;

var z = 2.0f * (float)random.NextDouble() - 1.0f;

var position = new Vector3(x, 0.0f, z) * GrassPatchSize / 2.0f + mPosition;

position.Y = terrain.GetHeight(position);

instances[mPatchInstancesOffset + i].Position = position;

}

public GrassInstancing[] mGrassInstances;

public Patch[] mPatches;

public bool mActivated;

private Terrain mTerrain;

private Random mRandom = new Random();

public Grass(Terrain terrain)

{

mActivated = true;

var patchesPerLine = terrain.Size / GrassPatchSize;

mGrassInstances = new GrassInstancing[patchesPerLine * patchesPerLine * GrassPatchInstancesCount];

mTerrain = terrain;

mPatches = new Patch[patchesPerLine * patchesPerLine];

for (var i = 0; i < patchesPerLine; i++)

{

for (var j = 0; j < patchesPerLine; j++)

{

var position = new Vector3(i * GrassPatchSize + GrassPatchSize / 2.0f - 128.0f, 0.0f, j * GrassPatchSize + GrassPatchSize / 2.0f - 128.0f);

var offset = (i * patchesPerLine + j) * GrassPatchInstancesCount;

position.Y = mTerrain.GetHeight(position);

mPatches[i * patchesPerLine + j] = new Patch(position, offset);

}

public void Generate()

{

foreach (var patch in mPatches)

{

patch.Generate(mTerrain, mGrassInstances, mRandom);

}