/// <summary>
/// Constructor of BufferManager class. Create two IndexBuffers,which are swaped when we need to do operations.
/// Create also VertexBuffer ,which represent a list of 3D vertices to be streamed to the graphics device
/// <param name="vertices">Array where vertices from terrain are store.</param>
/// <param name="device">GraphicsDevice</param>
/// </summary>
internal BufferManager(VertexMultitextured[] vertices, GraphicsDevice device)
{
_device = device;
VertexBuffer = new VertexBuffer(device, VertexMultitextured.VertexDeclaration, vertices.Length, BufferUsage.WriteOnly);
VertexBuffer.SetData(vertices);
_IndexBuffers = new IndexBuffer[]
{
new IndexBuffer(_device, IndexElementSize.ThirtyTwoBits, 1000000, BufferUsage.WriteOnly),
new IndexBuffer(_device, IndexElementSize.ThirtyTwoBits, 1000000, BufferUsage.WriteOnly)
};
}
/// <summary>
///
/// </summary>
/// <param name="objMap"></param>
/// <param name="terrainVertices"></param>
/// <param name="terrainWidth"></param>
/// <param name="terrainLength"></param>
/// <param name="heightData"></param>
public void GenerateObjPositions(VertexMultitextured[] terrainVertices, int terrainWidth, int terrainLength, float[,] heightData)
{
Color[] objMapColors = new Color[objMap.Width * objMap.Height];
objMap.GetData(objMapColors);
int[,] noiseData = new int[objMap.Width, objMap.Height];
for (int x = 0; x < objMap.Width; x++)
for (int y = 0; y < objMap.Height; y++)
noiseData[x, y] = objMapColors[y + x * objMap.Height].R;
this.envBilbList = new List<Vector3>();
Random random = new Random();
for (int x = 0; x < terrainWidth; x++)
{
for (int y = 0; y < terrainLength; y++)
{
float terrainHeight = heightData[x, y];
if ((terrainHeight > 1) && (terrainHeight <30))
{
float flatness = Vector3.Dot(terrainVertices[x + y * terrainWidth].Normal, new Vector3(0, -1, 0));
float minFlatness = (float)Math.Cos(MathHelper.ToRadians(15));
if (flatness > minFlatness)
{
float relx = (float)x / (float)terrainWidth;
float rely = (float)y / (float)terrainLength;
float noiseValueAtCurrentPosition = noiseData[(int)(relx * objMap.Width), (int)(rely * objMap.Height)];
float density;
if (noiseValueAtCurrentPosition > 200)
density = 3;
else if (noiseValueAtCurrentPosition > 100)
density = 2;
else if (noiseValueAtCurrentPosition > 1)
density = 1;
else
density = 0;
for (int currDetail = 0; currDetail < density; currDetail++)
{
float rand1 = (float)random.Next(1000000) / 10000000.0f;
float rand2 = (float)random.Next(1000000) / 10000000.0f;
Vector3 position = new Vector3((float)x - rand1, 0, (float)y - rand2);
position.Y = heightData[x, y];
envBilbList.Add(position );
}
}
}
}
}
}
