From e009cf5af9688b4affe4e41c0429e1e66ced5501 Mon Sep 17 00:00:00 2001
From: Stewart Allen <sa@grid.space>
Date: Sat, 15 Jan 2022 15:04:53 -0500
Subject: [PATCH] implement crude/inaccruate/test split

---
 src/main/mesh.js  | 15 ++++++++-------
 src/mesh/model.js | 25 +++++++++++++++++++++++--
 src/mesh/work.js  | 19 +++++++++++++++++++
 3 files changed, 50 insertions(+), 9 deletions(-)

diff --git a/src/main/mesh.js b/src/main/mesh.js
index ec8f9e05..cb177aaf 100644
--- a/src/main/mesh.js
+++ b/src/main/mesh.js
@@ -155,17 +155,19 @@ let split = {
         let state = split.state = { button, obj };
         // for split and lay flat modes
         space.mouse.onHover((int, event, ints) => {
-            let models = api.selection.models().map(m => m.mesh);
+            let models = state.models = api.selection.models();
+            let meshes = models.map(m => m.mesh);
             if (!event) {
-                return models;
+                return meshes;
             }
             let { button, buttons } = event;
             if (buttons) {
                 return;
             }
-            let { dim, mid } = util.bounds(models);
+            let { dim, mid } = util.bounds(meshes);
             let { x, y, z } = int.point;
-            state.point = { x, y, z };
+            // y is z in model space for the purposes of a split
+            state.plane = { z: y };
             obj.scale.set(dim.x, dim.y, 1);
             obj.position.set(mid.x, y, -mid.y);
         });
@@ -173,9 +175,8 @@ let split = {
     },
 
     select() {
-        // select plane (also exec)
-        console.log({select_plane: split.state});
-        split.end();
+        let { models, plane } = split.state;
+        Promise.all(models.map(m => m.split(plane))).then(split.end);
     },
 
     end() {
diff --git a/src/mesh/model.js b/src/mesh/model.js
index 4c6d75e0..464314d5 100644
--- a/src/mesh/model.js
+++ b/src/mesh/model.js
@@ -31,7 +31,7 @@ let materials = mesh.material = {
         transparent: true,
         shininess: 100,
         specular: 0x202020,
-        color: 0xffff00,
+        color: 0xf0f000,
         opacity: 1
     }),
     // model selected
@@ -40,7 +40,7 @@ let materials = mesh.material = {
         transparent: true,
         shininess: 100,
         specular: 0x202020,
-        color: 0x00ee00,
+        color: 0x00e000,
         opacity: 1
     }),
     // face selected (for groups ranges)
@@ -336,6 +336,27 @@ mesh.model = class MeshModel extends mesh.object {
         if (this._norm) this._norm.update();
     }
 
+    // split model along given plane
+    split(plane) {
+        // extract axes from plane and split when present (only z for now)
+        let { z } = plane;
+        return new Promise((resolve,reject) => {
+            let { id, matrix } = this;
+            worker.model_split({id, matrix, z}).then(data => {
+                let { o1, o2 } = data;
+                // this becomes bottom
+                this.reload(o1.toFloat32());
+                // new model becomes top
+                this.group.add(new mesh.model({
+                    file: `${this.file}-split`,
+                    mesh: o2.toFloat32()
+                })).select();
+                // and we're done
+                resolve();
+            });
+        });
+    }
+
     // remove model from group and space
     remove() {
         if (arguments.length === 0) {
diff --git a/src/mesh/work.js b/src/mesh/work.js
index 4b2993c2..9b30819a 100644
--- a/src/mesh/work.js
+++ b/src/mesh/work.js
@@ -82,6 +82,25 @@ let model = {
         return data;
     },
 
+    split(data) {
+        let { id, matrix, z } = data;
+        let o1 = [];
+        let o2 = [];
+        // let pos = translate_encode(id, matrix);
+        let pos = cache[id].geo.attributes.position.array;
+        for (let i=0, l=pos.length; i<l; ) {
+            let v1 = new Vector3(pos[i++], pos[i++], pos[i++]);
+            let v2 = new Vector3(pos[i++], pos[i++], pos[i++]);
+            let v3 = new Vector3(pos[i++], pos[i++], pos[i++]);
+            if (v1.z < z && v2.z < z && v3.z < z) {
+                o1.appendAll([...v1, ...v2, ...v3]);
+            } else {
+                o2.appendAll([...v1, ...v2, ...v3]);
+            }
+        }
+        return { o1, o2 };
+    },
+
     analyze(id) {
         let tool = analyze(id, { mapped: true });
         let { stats, mapped } = tool;