public Cube(Device device, Vector4 color)
: base(device)
{
CreateVertexStream(StreamUsage.Position, CreatePositions());
CreateVertexStream(StreamUsage.Color, ArrayHelper.Create(8, color));
CreateIndexStream(CreateIndices());
}
private static Vector4[] CreateColors()
{
var topLeft = new Vector4(1f, 0f, 0f, 0f);
var topRight = new Vector4(0f, 1f, 0f, 0f);
var bottomLeft = new Vector4(0f, 0f, 1f, 0f);
return new[] { topLeft, topRight, bottomLeft };
}
public Quad(Device device, Vector4 color)
: base(device)
{
CreateVertexStream(StreamUsage.Position, CreatePositions());
CreateVertexStream(StreamUsage.Color, ArrayHelper.Create(4, color));
CreateVertexStream(StreamUsage.Normal, CreateNormals());
CreateVertexStream(StreamUsage.TextureCoordinates0, CreateTextureCoordinates());
CreateIndexStream(CreateIndices());
}
private static Vector4[] CreateColors()
{
var frontbottomLeft = new Vector4(1f, 0f, 0f, 0f);
var fronttopLeft = new Vector4(0f, 1f, 0f, 0f);
var frontbottomRight = new Vector4(0f, 0f, 1f, 0f);
var fronttopRight = new Vector4(0.5f, 0.5f, 0.5f, 0f);
var backbottomLeft = new Vector4(1f, 0f, 0f, 0f);
var backtopLeft = new Vector4(0f, 1f, 0f, 0f);
var backbottomRight = new Vector4(0f, 0f, 1f, 0f);
var backtopRight = new Vector4(0.5f, 0.5f, 0.5f, 0f);
return new[] { frontbottomLeft, fronttopLeft, frontbottomRight, fronttopRight, backbottomRight, backtopRight, backbottomLeft, backtopLeft };
}
public Sphere(Device device, float radius = 1, int rings = 50, int columns = 50)
: base(device)
{
var positionCount = (rings + 1) * (columns + 1);
var positions = new Vector3[positionCount];
var normals = new Vector3[positionCount];
var colors = new Vector4[positionCount];
var indices = new uint[2 * rings * (columns + 1)];
var deltaRingAngle = Constants.PI / rings;
var deltaColumnAngle = 2 * Constants.PI / columns;
uint vertexIndex = 0;
for (uint ring = 0; ring < rings + 1; ring++)
{
var r0 = Functions.Sin(ring * deltaRingAngle);
var y0 = Functions.Cos(ring * deltaRingAngle);
for (uint column = 0; column < columns + 1; column++)
{
var normal = new Vector3(r0 * Functions.Sin(column * deltaColumnAngle), y0,
r0 * Functions.Cos(column * deltaColumnAngle));
//var uv = new Vector2(column / (float) columns, 1 - ring / (float) rings);
var index = ring * (columns + 1) + column;
positions[index] = normal * radius;
normals[index] = normal;
colors[index] = new Vector4(System.Math.Abs(normal.X), System.Math.Abs(normal.Y),
System.Math.Abs(normal.Z), 1);
if (ring < rings)
{
indices[vertexIndex * 2] = vertexIndex + (uint) columns + 1;
indices[vertexIndex * 2 + 1] = vertexIndex;
++vertexIndex;
}
}
}
CreateVertexStream(StreamUsage.Position, positions);
CreateIndexStream(indices, PrimitiveTopology.TriangleStrip);
CreateVertexStream(StreamUsage.Normal, normals);
CreateVertexStream(StreamUsage.Color, colors);
//CreateVertexStream(StreamUsage.Color, ArrayHelper.Create(positions.Count, new Vector4(0.5f, 0.5f, 1, 1)));
}
