/// <summary>
/// Creates a cube made up of pairs of triangles; stored as an indexed vertex array
/// </summary>
/// <param name="size">length of one side</param>
/// <returns>
/// Mesh with positions, ids, normals
/// </returns>
public static DefaultMesh CreateCubeWithNormals(float size = 1.0f)
{
var m = new DefaultMesh();
void createPosition(float x, float y, float z) => m.Position.Add(new Vector3(x, y, z));
void createID(uint index) => m.IDs.Add(index);
void createNormal(float x, float y, float z) => m.Normal.Add(new Vector3(x, y, z));
ShapeBuilder.Cube(createPosition, createID, size, createNormal);
return(m);
}
/// <summary>
/// creates a sphere made up of pairs of triangles; stored as an indexed vertex array
/// </summary>
/// <param name="radius">radius</param>
/// <param name="subdivision">subdivision count, each subdivision creates 4 times more faces</param>
/// <returns>
/// Mesh with positions, ids, normals
/// </returns>
public static DefaultMesh CreateSphere(float radius = 1.0f, uint subdivision = 1)
{
var m = new DefaultMesh();
//var pos = m.AddAttribute<Vector3>(Mesh.PositionName);
//var normal = m.AddAttribute<Vector3>(Mesh.NormalName);
void createPosition(float x, float y, float z) => m.Position.Add(new Vector3(x, y, z));
void createID(uint id) => m.IDs.Add(id);
void createNormal(float x, float y, float z) => m.Normal.Add(new Vector3(x, y, z));
ShapeBuilder.Sphere(createPosition, createID, radius, subdivision, createNormal);
return(m);
}
/// <summary>
/// Creates a plane made up of pairs of triangles; stored as an indexed vertex array.
/// </summary>
/// <param name="sizeX">extent of the grid in the x-coordinate axis</param>
/// <param name="sizeZ">extent of the grid in the z-coordinate axis</param>
/// <param name="segmentsX">number of grid segments in the x-coordinate axis</param>
/// <param name="segmentsZ">number of grid segments in the z-coordinate axis</param>
/// <returns>
/// Mesh with positions, ids, normals, and uvs
/// </returns>
public static DefaultMesh CreatePlane(float sizeX, float sizeZ, uint segmentsX, uint segmentsZ)
{
var m = new DefaultMesh();
void CreateVertex(float x, float z) => m.Position.Add(new Vector3(x, 0.0f, z));
void CreateID(uint id) => m.IDs.Add(id);
void CreateNormal() => m.Normal.Add(Vector3.UnitY);
void CreateUV(float u, float v) => m.TexCoord.Add(new Vector2(u, v));
var startX = -sizeX / 2f;
var startZ = -sizeZ / 2f;
ShapeBuilder.Grid(startX, sizeX, startZ, sizeZ, segmentsX, segmentsZ, CreateVertex, CreateID
, CreateNormal, CreateUV);
return(m);
}
