/// <summary>
/// Creates a platform from its top vertices.
/// </summary>
/// <returns>A new platform from the specified top vertices.</returns>
/// <param name="input">The top vertices of the platform.</param>
/// <param name="height">The thickness of the platform.</param>
private GameObject CreatePlatform(PlatformInput input, float height = 0)
{
if (height == 0)
{
height = surfaceHeight;
}
List <Vector3> bottom = new List <Vector3>(input.vertices.Count);
for (int i = 0; i < input.vertices.Count; i++)
{
bottom.Add(VectorUtil.SetY(input.vertices[i], input.vertices[i].y - height));
}
return(CreatePlatform(input, new PlatformInput(bottom)));
}
/// <summary>
/// Creates the walls in the level.
/// </summary>
/// <param name="wallInput">JSON data for the walls in the level.</param>
private void CreateWalls(List <WallInput> wallInput)
{
wallContainer = ObjectUtil.CreateNewObject("Walls");
foreach (WallInput wall in wallInput)
{
Vector3 direction = wall.endpoints[1] - wall.endpoints[0];
Vector3 ortho = VectorUtil.GetOrthonormal(direction) * wallThickness / 2;
List <Vector3> wallPoints = new List <Vector3>(4);
Vector3 heightOffset = Vector3.up * wallHeight / 2;
wallPoints.Add(wall.endpoints[0] + ortho + heightOffset);
wallPoints.Add(wall.endpoints[0] - ortho + heightOffset);
wallPoints.Add(wall.endpoints[1] - ortho + heightOffset);
wallPoints.Add(wall.endpoints[1] + ortho + heightOffset);
PlatformInput wallSurface = new PlatformInput(wallPoints);
GameObject wallObject = CreatePlatform(wallSurface, wallHeight);
wallObject.layer = LayerMask.NameToLayer("Wall");
wallObject.name = "Wall";
wallObject.GetComponent <Renderer>().material = wallMaterial;
wallObject.transform.parent = wallContainer.transform;
}
}
/// <summary>
/// Creates a platform from both top and bottom vertices.
/// </summary>
/// <returns>A new platform from the specified vertices.</returns>
/// <param name="top">The top vertices of the platform.</param>
/// <param name="bottom">The bottom vertices of the platform.</param>
private GameObject CreatePlatform(PlatformInput top, PlatformInput bottom)
{
GameObject virtualPlatform = new GameObject();
virtualPlatform.layer = LayerMask.NameToLayer("Platform");
virtualPlatform.AddComponent <MeshFilter>();
virtualPlatform.AddComponent <MeshRenderer>();
Mesh mesh = virtualPlatform.GetComponent <MeshFilter>().mesh;
// Create the vertices of the platform.
Vector3[] vertices = new Vector3[top.vertices.Count * 6];
// Used to determine clockwise/counter-clockwise.
float edgeSum = 0;
for (int i = 0; i < top.vertices.Count; i++)
{
vertices[i] = top.vertices[i];
vertices[i + top.vertices.Count] = bottom.vertices[i];
if (i < top.vertices.Count - 1)
{
edgeSum += (top.vertices[i + 1].x - top.vertices[i].x) * (top.vertices[i + 1].z + top.vertices[i].z);
}
else
{
edgeSum += (top.vertices[0].x - top.vertices[i].x) * (top.vertices[0].z + top.vertices[i].z);
}
}
bool clockwise = edgeSum > 0;
// Find the triangles that can make up the top and bottom faces of the platform mesh.
Triangulator triangulator = new Triangulator(top.vertices.ToArray());
int[] topTriangles = triangulator.Triangulate();
int[] triangles = new int[topTriangles.Length * 2 + top.vertices.Count * 6];
for (int i = 0; i < topTriangles.Length; i += 3)
{
triangles[i] = topTriangles[i];
triangles[i + 1] = topTriangles[i + 1];
triangles[i + 2] = topTriangles[i + 2];
triangles[topTriangles.Length + i] = topTriangles[i + 2] + top.vertices.Count;
triangles[topTriangles.Length + i + 1] = topTriangles[i + 1] + top.vertices.Count;
triangles[topTriangles.Length + i + 2] = topTriangles[i] + top.vertices.Count;
}
// Find the triangles for the sides of the platform.
for (int i = 0; i < top.vertices.Count; i++)
{
int triangleOffset = topTriangles.Length * 2 + i * 6;
int nextIndex = i < top.vertices.Count - 1 ? i + 1 : 0;
int vertexOffset = top.vertices.Count * 2 + i * 4;
vertices[vertexOffset] = vertices[i];
vertices[vertexOffset + 1] = vertices[nextIndex];
vertices[vertexOffset + 2] = vertices[top.vertices.Count + i];
vertices[vertexOffset + 3] = vertices[top.vertices.Count + nextIndex];
if (!clockwise)
{
triangles[triangleOffset] = vertexOffset;
triangles[triangleOffset + 1] = vertexOffset + 1;
triangles[triangleOffset + 2] = vertexOffset + 2;
triangles[triangleOffset + 3] = vertexOffset + 3;
triangles[triangleOffset + 4] = vertexOffset + 2;
triangles[triangleOffset + 5] = vertexOffset + 1;
}
else
{
triangles[triangleOffset + 5] = vertexOffset;
triangles[triangleOffset + 4] = vertexOffset + 1;
triangles[triangleOffset + 3] = vertexOffset + 2;
triangles[triangleOffset + 2] = vertexOffset + 3;
triangles[triangleOffset + 1] = vertexOffset + 2;
triangles[triangleOffset] = vertexOffset + 1;
}
}
mesh.vertices = vertices;
mesh.triangles = triangles;
mesh.RecalculateNormals();
virtualPlatform.AddComponent <MeshCollider>();
virtualPlatform.GetComponent <MeshCollider>().sharedMesh = mesh;
virtualPlatform.transform.parent = transform;
return(virtualPlatform);
}
