public NativePlainMesh(NativePlainMesh a, NativePlainMesh b, Allocator allocator)
{
int aVxLen = a.vertices.Length;
int bVxLen = b.vertices.Length;
var vxs = new NativeArray <Vector3>(aVxLen + bVxLen, allocator);
vxs.Slice(0, aVxLen).CopyFrom(a.vertices.Slice(0, aVxLen));
vxs.Slice(aVxLen, bVxLen).CopyFrom(b.vertices.Slice(0, bVxLen));
int aTrLen = a.triangles.Length;
int bTrLen = b.triangles.Length;
var trs = new NativeArray <int>(aTrLen + bTrLen, allocator);
trs.Slice(0, aTrLen).CopyFrom(a.triangles.Slice(0, aTrLen));
trs.Slice(aTrLen, bTrLen).CopyFrom(b.triangles.Slice(0, bTrLen));
for (int i = aTrLen; i < aTrLen + bTrLen; ++i)
{
int prevIndex = trs[i];
trs[i] = prevIndex + aVxLen;
}
this.vertices = vxs;
this.triangles = trs;
}
public void Add(NativePlainMesh mesh)
{
var vertexLayout = new MeshLayout.Layout(this.vertices.Count, mesh.vertices.Length);
var indexLayout = new MeshLayout.Layout(this.indices.Count, mesh.triangles.Length);
this.vertices.Add(mesh.vertices);
this.indices.Add(mesh.triangles);
this.layouts.Add(new MeshLayout(vertexLayout, indexLayout));
}
public static NativePlainMesh Build(Shape shape, float depth, Allocator allocator)
{
var edges = Convert(shape.triangles, shape.paths, Allocator.Temp);
int n = edges.Length;
var vertices = new NativeArray <Vector3>(4 * n, allocator);
var triangles = new NativeArray <int>(6 * n, allocator);
int ti = 0;
float r = 0.5f * depth;
for (int i = 0, j = 0; i < edges.Length; ++i)
{
var edge = edges[i];
var a = shape.points[edge.a];
var b = shape.points[edge.b];
var dir = (b - a).normalized * r;
var normal = new Vector2(-dir.y, dir.x);
triangles[ti++] = j;
triangles[ti++] = j + 1;
triangles[ti++] = j + 2;
triangles[ti++] = j;
triangles[ti++] = j + 2;
triangles[ti++] = j + 3;
var a0 = new Vector3(a.x - normal.x, a.y - normal.y);
var a1 = new Vector3(a.x + normal.x, a.y + normal.y);
var b1 = new Vector3(b.x + normal.x, b.y + normal.y);
var b0 = new Vector3(b.x - normal.x, b.y - normal.y);
vertices[j++] = a0;
vertices[j++] = a1;
vertices[j++] = b1;
vertices[j++] = b0;
}
var nativeMesh = new NativePlainMesh {
vertices = vertices,
triangles = triangles
};
return(nativeMesh);
}
