private void DrawIllumination()
{
RaycastHit2D[] hits = null;
_source.GetHits(ref hits);
if (hits.Length == 0)
{
return;
}
// pre-calc some values
int rayCount = 4 * hits.Length; // 4 rays per hit
int vertCount = rayCount + 1; // 1 vert per ray, +1 for centre
var rays = new LightRay[rayCount];
var verts = new Vector3[vertCount];
var uv = new Vector2[verts.Length];
var indices = new int[3 * rayCount];
verts[0] = _source.Position;
int ri = 0;
for (int i = 0; i < hits.Length; i++)
{
var collider = hits[i].collider as CircleCollider2D;
_source.GetRays(ref rays, ri, collider);
ri += 4;
}
System.Array.Sort(rays, _comparer);
for (int i = 0; i < rays.Length; i++)
{
verts[i + 1] = rays[i].end;
}
// verts[0] is mesh centre
for (int i = 0; i < rayCount - 1; i++)
{
int ti = 3 * i;
indices[ti] = 0;
indices[ti + 1] = i + 1;
indices[ti + 2] = i + 2;
}
var li = indices.Length;
indices[li - 3] = 0;
indices[li - 2] = vertCount - 1;
indices[li - 1] = 1;
_mesh.Clear();
_mesh.vertices = verts;
_mesh.triangles = indices;
_mesh.RecalculateNormals();
_mesh.RecalculateBounds();
var size = _source.range * 2;
for (int i = 0; i < verts.Length; i++)
{
var tv = (Vector2)verts[i] - _source.Position;
uv[i].x = tv.x / size;
uv[i].y = tv.y / size;
}
_mesh.uv = uv;
}