public void SubdivideDetail(Vector origin, Vector forward, Vector up, double size)
{
var right = Vector.Cross(up, forward);
Func <Vector, bool> isDetail = v =>
GeoUtil.RectContains(GeoUtil.ProjectOnPlaneTransformed(v, origin, up, right), size);
int triCount = TriangleCount;
for (int i = 0; i < triCount; i++)
{
var n = normals[i];
var v0 = vertices[i * 3 + 0];
var v1 = vertices[i * 3 + 1];
var v2 = vertices[i * 3 + 2];
var dot = Vector.Dot(forward, n);
bool shouldSubdivide = isDetail(v0) || isDetail(v1) || isDetail(v2);
shouldSubdivide &= dot < -0.01;
if (!shouldSubdivide)
{
continue;
}
var v01 = (v0 + v1) * 0.5;
var v12 = (v1 + v2) * 0.5;
var v20 = (v2 + v0) * 0.5;
vertices[i * 3 + 0] = v01;
vertices[i * 3 + 1] = v1;
vertices[i * 3 + 2] = v12;
vertices.Add(v12);
vertices.Add(v2);
vertices.Add(v20);
vertices.Add(v20);
vertices.Add(v0);
vertices.Add(v01);
vertices.Add(v01);
vertices.Add(v12);
vertices.Add(v20);
var normal = normals[i];
normals.Add(normal);
normals.Add(normal);
normals.Add(normal);
}
}
/// <summary>
///
/// </summary>
/// <param name="id">ID in base 10 to be converted and embedded onto the mesh</param>
/// <param name="mesh">Mesh to be modified</param>
/// <param name="size">Size of the largest dimension of the shape matrix, in input file's units</param>
/// <param name="margin">Space between shape cells. (Closest distance between two crevice vertex minus thickness)</param>
/// <param name="thickness">Thickness of crevices</param>
/// <param name="displacement">Displacement of crevice vertices in the forward direction</param>
/// <param name="origin">Origin of the projection plane</param>
/// <param name="forward">Direction of the projection</param>
/// <param name="up">Up direction of the projection plane to determine the matrix orientation</param>
public void Embed(int id, Mesh mesh, double size, double margin, double thickness, double displacement,
Vector origin,
Vector forward, Vector up)
{
var right = Vector.Cross(up, forward);
var encodedShapes = GetEncodedShapes(id);
var lines = ConstructMatrix(encodedShapes, size, thickness + margin);
var vertices = mesh.vertices;
var normals = mesh.normals;
for (var i = 0; i < vertices.Count; i++)
{
var v = vertices[i];
var n = normals[i];
if (Vector.Dot(forward, n) >= -0.01)
{
// Not facing the projection plane, no need to continue further.
continue;
}
// TODO: Additional check to see if the face is facing the projection plane but occluded by other faces in the geometry.
// Required for complex geometry.
var vProj = GeoUtil.ProjectOnPlaneTransformed(v, origin, up, right);
// Check for each line if the projected point lies inside it, with the thickness used as the threshold.
foreach (var line in lines)
{
var dist = GeoUtil.PointLineDistance(vProj, line);
if (dist < thickness * 0.5)
{
// Point inside a line, modify the vertex and early exit the loop, no need to check any other line.
bool smoothDisplacement = false;
if (smoothDisplacement)
{
vertices[i] = v + forward * displacement * Smoothstep(1 - dist / (thickness * 0.5));
}
else
{
vertices[i] = v + forward * displacement;
}
break;
}
}
}
}