public Sphere(ESphere type, IModule module, Color[] colors, float diameter = 2048, int tessellation = 128) {
Vertices = new List<VertexPositionNormalColor>();
Indices = new List<short>();
if (tessellation < 3 || tessellation > 128) {
throw new ArgumentOutOfRangeException(nameof(tessellation));
}
var verticalSegments = tessellation;
var horizontalSegments = tessellation * 2;
var radius = diameter / 2;
var noise = module.GetPlanet(horizontalSegments, verticalSegments);
switch (type) {
case ESphere.Terrain: {
#region Terrain Vertex
AddVertex(Vector3.Down * radius * (1.0f + (float)noise[0, 0]), Vector3.Down, Color.White);
for (var i = 0; i < verticalSegments - 1; i++) {
var latitude = ((i + 1) * MathHelper.Pi / verticalSegments) - MathHelper.PiOver2;
var dy = (float)Math.Sin(latitude);
var dxz = (float)Math.Cos(latitude);
for (var j = 0; j < horizontalSegments; j++) {
var longitude = j * MathHelper.TwoPi / horizontalSegments;
var dx = (float)Math.Cos(longitude) * dxz;
var dz = (float)Math.Sin(longitude) * dxz;
var normal = new Vector3(dx, dy, dz);
var value = 1.0f + (float)noise[j, i];
var color = colors.GetColorAt(value - 1.0f);
var v = value;
AddVertex(normal * radius * v, normal * v, color);
}
}
AddVertex(Vector3.Up * radius * (1.0f + (float)noise[horizontalSegments - 1, verticalSegments - 1]), Vector3.Up, Color.White);
#endregion
break;
}
case ESphere.Ocean: {
#region Ocean Vertex
AddVertex(Vector3.Down * radius, Vector3.Down, Color.White);
for (var i = 0; i < verticalSegments - 1; i++) {
var latitude = ((i + 1) * MathHelper.Pi / verticalSegments) - MathHelper.PiOver2;
var dy = (float)Math.Sin(latitude);
var dxz = (float)Math.Cos(latitude);
for (var j = 0; j < horizontalSegments; j++) {
var longitude = j * MathHelper.TwoPi / horizontalSegments;
var dx = (float)Math.Cos(longitude) * dxz;
var dz = (float)Math.Sin(longitude) * dxz;
var normal = new Vector3(dx, dy, dz);
AddVertex(normal * radius, normal, colors.GetColorAt(0.0d));
}
}
AddVertex(Vector3.Up * radius, Vector3.Up, Color.White);
#endregion
break;
}
case ESphere.Sky: {
#region Sky Vertex
AddVertex(Vector3.Down * radius, Vector3.Down, Color.White);
for (var i = 0; i < verticalSegments - 1; i++) {
var latitude = ((i + 1) * MathHelper.Pi / verticalSegments) - MathHelper.PiOver2;
var dy = (float)Math.Sin(latitude);
var dxz = (float)Math.Cos(latitude);
for (var j = 0; j < horizontalSegments; j++) {
var longitude = j * MathHelper.TwoPi / horizontalSegments;
var dx = (float)Math.Cos(longitude) * dxz;
var dz = (float)Math.Sin(longitude) * dxz;
var normal = new Vector3(dx, dy, dz);
var value = (float)noise[j, i];
var color = colors.GetColorAt(value);
AddVertex(normal * radius, normal, color);
}
}
AddVertex(Vector3.Up * radius, Vector3.Up, Color.White);
#endregion
break;
}
default: {
throw new InvalidEnumArgumentException(nameof(type));
}
}
#region Index
for (var i = 0; i < horizontalSegments; i++) {
AddIndex(0);
AddIndex(1 + (i + 1) % horizontalSegments);
AddIndex(1 + i);
}
for (var i = 0; i < verticalSegments - 2; i++) {
for (var j = 0; j < horizontalSegments; j++) {
var nextI = i + 1;
var nextJ = (j + 1) % horizontalSegments;
AddIndex(1 + i * horizontalSegments + j);
AddIndex(1 + i * horizontalSegments + nextJ);
AddIndex(1 + nextI * horizontalSegments + j);
AddIndex(1 + i * horizontalSegments + nextJ);
AddIndex(1 + nextI * horizontalSegments + nextJ);
AddIndex(1 + nextI * horizontalSegments + j);
}
}
for (var i = 0; i < horizontalSegments; i++) {
var currentVertex = Vertices.Count;
AddIndex(currentVertex - 1);
AddIndex(currentVertex - 2 - (i + 1) % horizontalSegments);
AddIndex(currentVertex - 2 - i);
}
#endregion
InitializePrimitive(Game.Instance.GraphicsDevice);
}