public NavMesh(GraphicsDevice device, datx02_rally.GameLogic.Curve curve, int resolution, float width, Vector3 terrainScale)
{
this.device = device;
#region Vertices
//vertices = new NavMeshTriangleVertex[2 * resolution];
vertices = new VertexPositionColor[2 * resolution];
{
int i = 0;
var curveRasterization = new CurveRasterization(curve, resolution).Points;
foreach (var point in curveRasterization)
{
vertices[i++] = new VertexPositionColor(10 * Vector3.Up + point.Position - (terrainScale * width * point.Side), Color.White);
vertices[i++] = new VertexPositionColor(10 * Vector3.Up + point.Position + (terrainScale * width * point.Side), Color.White);
}
}
#endregion
#region Indicies
int[] indices = new int[6 * resolution];
int[] offsets = { 0, 1, 2, 2, 1, 0 };
for (int i = 0; i < indices.Length; i++)
{
int v = i / 3 + offsets[i % 6];
if (v >= vertices.Length)
{
v -= vertices.Length;
}
indices[i] = v;
}
#endregion
#region Triangles
triangles = new NavMeshTriangle[2 * resolution];
for (int i = 0; i < indices.Length; i += 3)
{
triangles[i / 3] = new NavMeshTriangle(vertices[indices[i]].Position,
vertices[indices[i + 1]].Position,
vertices[indices[i + 2]].Position);
}
// Smoothen out normals
for (int i = 1; i < triangles.Length; i += 2)
{
int j = i - 1, c = i - 2, d = j - 2;
if (c < 0)
{
c += triangles.Length;
d += triangles.Length;
}
Vector3 normal = Vector3.Lerp(triangles[i].normal, triangles[j].normal, .5f);
Vector3 others = Vector3.Lerp(triangles[c].normal, triangles[d].normal, .5f);
normal = Vector3.Lerp(normal, others, .6f);
triangles[i].normal = triangles[j].normal = normal;
}
#endregion
#region Buffers
indexBuffer = new IndexBuffer(device, typeof(int), indices.Length, BufferUsage.None);
indexBuffer.SetData(indices);
indexBuffer.SetData(indices, 0, 6);
vertexbuffer = new VertexBuffer(device,
typeof(VertexPositionColor), vertices.Length,
BufferUsage.None);
vertexbuffer.SetData(vertices);
vertexbuffer.SetData(vertices, 0, 6);
#endregion
Effect = new BasicEffect(device);
}
private bool CollisionCheck(NavMeshTriangle triangle)
{
var downray = new Ray(Car.Position, Vector3.Down);
var upray = new Ray(Car.Position, Vector3.Up);
float? d1 = downray.Intersects(triangle.trianglePlane),
d2 = upray.Intersects(triangle.trianglePlane);
if (d1.HasValue || d2.HasValue)
{
float d = d1.HasValue ? d1.Value : d2.Value;
Ray ray = d1.HasValue ? downray : upray;
var point = ray.Position + d * ray.Direction;
bool onTriangle = PointInTriangle(triangle.vertices[0],
triangle.vertices[1],
triangle.vertices[2],
point);
if (onTriangle)
{
Car.Position = point;
Car.Normal = triangle.normal;
}
return onTriangle;
}
return false;
}
public NavMesh(GraphicsDevice device, datx02_rally.GameLogic.Curve curve, int resolution, float width, Vector3 terrainScale)
{
this.device = device;
#region Vertices
//vertices = new NavMeshTriangleVertex[2 * resolution];
vertices = new VertexPositionColor[2 * resolution];
{
int i = 0;
var curveRasterization = new CurveRasterization(curve, resolution).Points;
foreach (var point in curveRasterization)
{
vertices[i++] = new VertexPositionColor(10 * Vector3.Up + point.Position - (terrainScale * width * point.Side), Color.White);
vertices[i++] = new VertexPositionColor(10 * Vector3.Up + point.Position + (terrainScale * width * point.Side), Color.White);
}
}
#endregion
#region Indicies
int[] indices = new int[6 * resolution];
int[] offsets = { 0, 1, 2, 2, 1, 0 };
for (int i = 0; i < indices.Length; i++)
{
int v = i / 3 + offsets[i % 6];
if (v >= vertices.Length)
v -= vertices.Length;
indices[i] = v;
}
#endregion
#region Triangles
triangles = new NavMeshTriangle[2 * resolution];
for (int i = 0; i < indices.Length; i += 3)
{
triangles[i / 3] = new NavMeshTriangle(vertices[indices[i]].Position,
vertices[indices[i + 1]].Position,
vertices[indices[i + 2]].Position);
}
// Smoothen out normals
for (int i = 1; i < triangles.Length; i += 2)
{
int j = i - 1, c = i - 2, d = j - 2;
if (c < 0)
{
c += triangles.Length;
d += triangles.Length;
}
Vector3 normal = Vector3.Lerp(triangles[i].normal, triangles[j].normal, .5f);
Vector3 others = Vector3.Lerp(triangles[c].normal, triangles[d].normal, .5f);
normal = Vector3.Lerp(normal, others, .6f);
triangles[i].normal = triangles[j].normal = normal;
}
#endregion
#region Buffers
indexBuffer = new IndexBuffer(device, typeof(int), indices.Length, BufferUsage.None);
indexBuffer.SetData(indices);
indexBuffer.SetData(indices, 0, 6);
vertexbuffer = new VertexBuffer(device,
typeof(VertexPositionColor), vertices.Length,
BufferUsage.None);
vertexbuffer.SetData(vertices);
vertexbuffer.SetData(vertices, 0, 6);
#endregion
Effect = new BasicEffect(device);
}
