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Crease (Shift+E): picked edges stay sharp when the shape's smoothed (carried through each level and the mirror; saved); shown in magenta; tests

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Nexoniarz 2026-10-21 07:58:43 +02:00
commit ab554f277f
6 changed files with 108 additions and 6 deletions
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34
src/app.cpp
View file

@ -5431,6 +5431,7 @@ private:
if (key(ImGuiKey_F12)) dialog(5);
if (key(ImGuiKey_Q)) setTool(Tool::Select);
if (key(ImGuiKey_W)) setTool(Tool::Move);
if (key(ImGuiKey_E) && shift && mode_ == Mode::Edit) return creaseSelected();
if (key(ImGuiKey_E)) setTool(Tool::Rotate);
if (key(ImGuiKey_R)) setTool(Tool::Scale);
if (key(ImGuiKey_D)) setTool(Tool::Draw);
@ -5790,6 +5791,16 @@ private:
lines(*ed, shownMesh(*ed), IM_COL32(20, 20, 25, 70), 1.0f, false);
lines(*ed, ed->mesh, shading() == Shading::Wire ? IM_COL32(230, 230, 235, 230) : IM_COL32(12, 12, 15, 235), 1.3f, true);
}
if (ed && !ed->creases.empty()) { // (creased edges: smoothing keeps them sharp)
const glm::mat4 m = objectMatrix(*ed);
const int n = int(ed->mesh.verts.size());
for (auto [a, b] : ed->creases) {
ImVec2 sa, sb;
if (a < n && b < n && (xray_ || (pointSeen(*ed, a) && pointSeen(*ed, b))) && project(glm::vec3(m * glm::vec4(ed->mesh.verts[size_t(a)], 1.0f)), sa) &&
project(glm::vec3(m * glm::vec4(ed->mesh.verts[size_t(b)], 1.0f)), sb))
dl->AddLine(sa, sb, IM_COL32(230, 70, 200, 255), 2.5f);
}
}
if (Object* o = ed) {
const glm::mat4 m = objectMatrix(*o);
if (elem_ == Elem::Vertex) {
@ -6151,6 +6162,7 @@ private:
add("shape.bridge", "Bridge two faces", "Shape", "", [this] { bridgeNow(); }, editing, "tunnel connect");
add("shape.soft", "Soft selection on / off", "Shape", "Shift+O", [this] { softSel_ = !softSel_; }, {}, "proportional falloff");
add("shape.separate", "Make into its own object", "Shape", "P", [this] { separateSelected(); }, editing, "separate split");
add("shape.crease", "Crease the picked edges (stay sharp when smoothed)", "Shape", "Shift+E", [this] { creaseSelected(); }, editing, "sharp hard edge subdivision smooth");
add("shape.slide", "Slide the points along their edges...", "Shape", "Alt+G", [this] { startSlide(); }, editing, "edge slide vertex slide");
add("shape.mirror", "Mirror editing (both sides change together)", "Shape", "", [this] { liveMirror_ = !liveMirror_, say(liveMirror_ ? "Mirror editing on: both sides change together" : "Mirror editing off"); }, {}, "symmetry symmetric x");
add("view.solid", "Show: solid", "View", "Z", [this] { shading_ = Shading::Solid; });
@ -8110,6 +8122,28 @@ private:
for (const std::string& d : did) text += (text.empty() ? "" : ", ") + d;
say("Repaired: " + text + (still ? std::format(". {} still not closed (see the Print tab)", still) : ". Ready to print"));
}
// Crease (Shift+E): the picked edges (or those between picked points / round picked faces)
// kept sharp when the shape's smoothed; again: not.
void creaseSelected() {
Object* o = editing();
if (!o) return say("Crease works on a shape being edited (Tab)");
std::set<std::pair<int, int>> picked;
if (elem_ == Elem::Edge)
for (auto [a, b] : selEdges_) picked.insert({std::min(a, b), std::max(a, b)});
else {
const std::set<int> pts = selectedPoints();
for (const auto& e : adjacencyOf(*o, o->mesh).edges)
if (pts.count(e[0]) && pts.count(e[1])) picked.insert({e[0], e[1]});
}
if (picked.empty()) return say("Pick the edges to crease first (Edges, 2)");
pushUndo();
const bool all = std::all_of(picked.begin(), picked.end(), [&](const auto& e) { return o->creases.count(e) > 0; });
for (const auto& e : picked) all ? (void)o->creases.erase(e) : (void)o->creases.insert(e);
touched(o->id);
say(all ? std::format("{} edge{} smooth again", picked.size(), picked.size() == 1 ? "" : "s")
: std::format("{} edge{} creased: smoothing keeps {} sharp{}", picked.size(), picked.size() == 1 ? "" : "s", picked.size() == 1 ? "it" : "them",
o->smoothLevels ? "" : " (turn on Smooth out to see)"));
}
// Slide (Alt+G): the picked points glide along their edges, each along the edge that goes
// most the way the mouse goes, never past its other end. Click: done. Esc / right click: as it was.
struct Slide {

5
src/mesh.h
View file

@ -75,8 +75,9 @@ void bevelEdges(Mesh& m, const std::set<std::pair<int, int>>& edges, float width
// Edges where the faces meet sharper than `angle` degrees.
std::set<std::pair<int, int>> sharpEdges(const Mesh& m, float angle);
// Every face cut into four-sided pieces; `smooth` rounds it (Catmull–Clark) — edges sharper
// than `keepAngle` degrees stay sharp (180: none do).
void subdivide(Mesh& m, bool smooth, float keepAngle = 180.0f);
// than `keepAngle` degrees stay sharp (180: none do), and the `creases` (point pairs, the lower
// first) too: they're made the new edges along them, for the next time round.
void subdivide(Mesh& m, bool smooth, float keepAngle = 180.0f, std::set<std::pair<int, int>>* creases = nullptr);
// The ring of four-sided faces across an edge, cut round the middle `cuts` times. Returns the new
// points (empty if the edge has no four-sided face).
std::vector<int> loopCut(Mesh& m, std::pair<int, int> edge, int cuts = 1);

30
src/scene.cpp
View file

@ -113,6 +113,9 @@ void applyMaterial(Object& o, const MaterialPreset& m) {
Mesh finishedMesh(const Object& o, bool mirrorOnly) {
Mesh m = o.mesh;
std::set<std::pair<int, int>> creases;
for (const auto& [a, b] : o.creases) // (only those still edges of its points)
if (a >= 0 && b >= 0 && a < int(m.verts.size()) && b < int(m.verts.size())) creases.insert({std::min(a, b), std::max(a, b)});
for (int axis = 0; axis < 3; ++axis) {
if (!(o.mirror & (1 << axis))) continue;
glm::vec3 s(1.0f);
@ -127,6 +130,10 @@ Mesh finishedMesh(const Object& o, bool mirrorOnly) {
if (std::abs(m.verts[i][axis]) < eps) to[i] = int(i - before);
for (auto& f : m.faces)
for (int& v : f) v = to[size_t(v)];
for (const auto& [a, b] : std::set(creases)) { // (the creases mirrored with it)
const int p = to[size_t(a) + before], q = to[size_t(b) + before];
creases.insert({std::min(p, q), std::max(p, q)});
}
std::erase_if(m.faces, [](const std::vector<int>& f) { return std::set<int>(f.begin(), f.end()).size() < 3; });
// (a face lying on the mirror line would now be there twice, back to back: both go)
std::map<std::vector<int>, int> seen;
@ -140,11 +147,23 @@ Mesh finishedMesh(const Object& o, bool mirrorOnly) {
std::sort(k.begin(), k.end());
return seen[k] > 1;
});
{ // (the creases numbered as removeUnused is about to number the points)
std::vector<int> num(m.verts.size(), -1);
for (const auto& f : m.faces)
for (int v : f) num[size_t(v)] = 0;
int next = 0;
for (int& n : num)
if (n == 0) n = next++;
std::set<std::pair<int, int>> now;
for (const auto& [a, b] : creases)
if (num[size_t(a)] >= 0 && num[size_t(b)] >= 0) now.insert({std::min(num[size_t(a)], num[size_t(b)]), std::max(num[size_t(a)], num[size_t(b)])});
creases = std::move(now);
}
removeUnused(m);
}
if (mirrorOnly) return m;
if (o.round > 0.0f) bevelEdges(m, sharpEdges(m, o.roundAngle), o.round, o.roundSteps);
for (int i = 0; i < std::min(o.smoothLevels, 4); ++i) subdivide(m, true, o.smoothKeepSharp ? 30.0f : 180.0f);
if (o.round > 0.0f) bevelEdges(m, sharpEdges(m, o.roundAngle), o.round, o.roundSteps), creases.clear(); // (rounded: its points renumbered)
for (int i = 0; i < std::min(o.smoothLevels, 4); ++i) subdivide(m, true, o.smoothKeepSharp ? 30.0f : 180.0f, &creases);
return m;
}
@ -229,6 +248,11 @@ std::string sceneText(const Scene& scene) {
if (o.mirror) out << " mirror " << o.mirror << "\n";
if (o.round > 0.0f) out << " round " << o.round << " " << o.roundSteps << " " << o.roundAngle << "\n";
if (o.smoothLevels) out << " subdivide " << o.smoothLevels << " " << o.smoothKeepSharp << "\n";
if (!o.creases.empty()) {
out << " crease";
for (const auto& [a, b] : o.creases) out << " " << a << " " << b;
out << "\n";
}
if (!o.pictureFile.empty()) out << " picture " << quoted(o.pictureFile) << "\n";
for (const PictureLayer& l : o.layers) {
if (l.file.empty()) continue;
@ -356,6 +380,8 @@ std::optional<Scene> parseScene(std::istream& in, const std::string& path, std::
} else if (word == "mirror") l >> o->mirror;
else if (word == "round") l >> o->round >> o->roundSteps >> o->roundAngle;
else if (word == "subdivide") l >> o->smoothLevels >> o->smoothKeepSharp;
else if (word == "crease")
for (int a, b; l >> a >> b;) o->creases.insert({std::min(a, b), std::max(a, b)});
else if (word == "picture") o->pictureFile = readQuoted(l);
else if (word == "layer") {
PictureLayer p;

2
src/scene.h
View file

@ -10,6 +10,7 @@
#include <cstdint>
#include <memory>
#include <optional>
#include <set>
#include <string>
#include <string_view>
#include <vector>
@ -64,6 +65,7 @@ struct Object {
int roundSteps = 3;
int smoothLevels = 0;
bool smoothKeepSharp = false;
std::set<std::pair<int, int>> creases; // edges (points, the lower first) smoothing keeps sharp
bool hasFinish() const { return mirror || round > 0.0f || smoothLevels > 0; }
// A painted picture on it: where each face corner sits on it (0..1), and the picture
// (shared with the undo steps until it's painted on again). Saved beside the .fry as a PNG.

21
src/tools.cpp
View file

@ -267,11 +267,11 @@ void bevelEdges(Mesh& m, const std::set<std::pair<int, int>>& want, float width,
// ── Subdivide (Catmull–Clark) ──
void subdivide(Mesh& m, bool smooth, float keepAngle) {
void subdivide(Mesh& m, bool smooth, float keepAngle, std::set<std::pair<int, int>>* creases) {
if (m.faces.empty()) return;
const auto d = directed(m);
const std::set<Edge> sharp = keepAngle < 179.9f ? sharpEdges(m, keepAngle) : std::set<Edge>{};
auto crease = [&](int a, int b) { return !d.count({a, b}) || !d.count({b, a}) || sharp.count(key(a, b)); };
auto crease = [&](int a, int b) { return !d.count({a, b}) || !d.count({b, a}) || sharp.count(key(a, b)) || (creases && creases->count(key(a, b))); };
Mesh out;
out.verts = m.verts;
std::vector<int> facePt(m.faces.size());
@ -317,6 +317,23 @@ void subdivide(Mesh& m, bool smooth, float keepAngle) {
for (size_t i = 0; i < n; ++i)
out.faces.push_back({fv[i], edgePt[key(fv[i], fv[(i + 1) % n])], facePt[f], edgePt[key(fv[(i + n - 1) % n], fv[i])]});
}
if (creases) { // (each crease is now two edges, through its new middle point; numbered as removeUnused will)
std::vector<int> to(out.verts.size(), -1);
int next = 0;
std::vector<bool> used(out.verts.size());
for (const auto& f : out.faces)
for (int v : f) used[size_t(v)] = true;
for (size_t v = 0; v < used.size(); ++v)
if (used[v]) to[v] = next++;
std::set<std::pair<int, int>> now;
for (const auto& [a, b] : *creases) {
const auto it = edgePt.find(key(a, b));
if (it == edgePt.end()) continue; // (not an edge any more)
for (const auto& [p, q] : {std::pair{a, it->second}, std::pair{it->second, b}})
if (to[size_t(p)] >= 0 && to[size_t(q)] >= 0) now.insert(key(to[size_t(p)], to[size_t(q)]));
}
*creases = std::move(now);
}
m = std::move(out);
removeUnused(m);
}