From d2ea1c45c3912722d510d7bcac9b61220f7a76fe Mon Sep 17 00:00:00 2001
From: Richard Davey <rich@photonstorm.com>
Date: Thu, 8 Oct 2020 13:23:20 +0100
Subject: [PATCH] Create GenerateObjVerts.js

---
 src/geom/mesh/GenerateObjVerts.js | 120 ++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 src/geom/mesh/GenerateObjVerts.js

diff --git a/src/geom/mesh/GenerateObjVerts.js b/src/geom/mesh/GenerateObjVerts.js
new file mode 100644
index 000000000..63f170592
--- /dev/null
+++ b/src/geom/mesh/GenerateObjVerts.js
@@ -0,0 +1,120 @@
+/**
+ * @author       Richard Davey <rich@photonstorm.com>
+ * @copyright    2020 Photon Storm Ltd.
+ * @license      {@link https://opensource.org/licenses/MIT|MIT License}
+ */
+
+var Face = require('./Face');
+var Vertex = require('./Vertex');
+
+/**
+ * This method will return an object containing Face and Vertex instances, generated
+ * from the parsed triangulated OBJ Model data given to this function.
+ *
+ * The obj data should have been parsed in advance via the ParseObj function:
+ *
+ * ```javascript
+ * var data = Phaser.Geom.Mesh.ParseObj(rawData, flipUV);
+ *
+ * var results = GenerateObjVerts(data);
+ * ```
+ *
+ * Alternatively, you can parse obj files loaded via the OBJFile loader:
+ *
+ * ```javascript
+ * preload ()
+ * {
+ *   this.load.obj('alien', 'assets/3d/alien.obj);
+ * }
+ *
+ * var results = GenerateObjVerts(this.cache.obj.get('alien));
+ * ```
+ *
+ * Make sure your 3D package has triangulated the model data prior to exporting it.
+ *
+ * You can use the data returned by this function to populate the vertices of a Mesh Game Object.
+ *
+ * You may add multiple models to a single Mesh, although they will act as one when
+ * moved or rotated. You can scale the model data, should it be too small (or large) to visualize.
+ * You can also offset the model via the `x`, `y` and `z` parameters.
+ *
+ * @function Phaser.Geom.Mesh.GenerateObjVerts
+ * @since 3.50.0
+ *
+ * @param {Phaser.Types.Geom.Mesh.OBJData} data - The parsed OBJ model data.
+ * @param {Phaser.GameObjects.Mesh} [mesh] - An optional Mesh Game Object. If given, the generated Faces will be automatically added to this Mesh. Set to `null` to skip.
+ * @param {number} [scale=1] - An amount to scale the model data by. Use this if the model has exported too small, or large, to see.
+ * @param {number} [x=0] - Offset the model x position by this amount.
+ * @param {number} [y=0] - Offset the model y position by this amount.
+ * @param {number} [z=0] - Offset the model z position by this amount.
+ *
+ * @return {Phaser.Types.Geom.Mesh.GenerateVertsResult} The parsed Face and Vertex objects.
+ */
+var GenerateObjVerts = function (data, mesh, scale, x, y, z)
+{
+    if (scale === undefined) { scale = 1; }
+    if (x === undefined) { x = 0; }
+    if (y === undefined) { y = 0; }
+    if (z === undefined) { z = 0; }
+
+    var result = {
+        faces: [],
+        verts: []
+    };
+
+    var materials = data.materials;
+
+    for (var m = 0; m < data.models.length; m++)
+    {
+        var model = data.models[m];
+
+        var vertices = model.vertices;
+        var textureCoords = model.textureCoords;
+        var faces = model.faces;
+
+        for (var i = 0; i < faces.length; i++)
+        {
+            var face = faces[i];
+
+            var v1 = face.vertices[0];
+            var v2 = face.vertices[1];
+            var v3 = face.vertices[2];
+
+            var m1 = vertices[v1.vertexIndex];
+            var m2 = vertices[v2.vertexIndex];
+            var m3 = vertices[v3.vertexIndex];
+
+            var t1 = v1.textureCoordsIndex;
+            var t2 = v2.textureCoordsIndex;
+            var t3 = v3.textureCoordsIndex;
+
+            var uv1 = (t1 === -1) ? { u: 0, v: 1 } : textureCoords[t1];
+            var uv2 = (t2 === -1) ? { u: 0, v: 0 } : textureCoords[t2];
+            var uv3 = (t3 === -1) ? { u: 1, v: 1 } : textureCoords[t3];
+
+            var color = 0xffffff;
+
+            if (face.material !== '' && materials[face.material])
+            {
+                color = materials[face.material];
+            }
+
+            var vert1 = new Vertex(x + m1.x * scale, y + m1.y * scale, z + m1.z * scale, uv1.u, uv1.v, color);
+            var vert2 = new Vertex(x + m2.x * scale, y + m2.y * scale, z + m2.z * scale, uv2.u, uv2.v, color);
+            var vert3 = new Vertex(x + m3.x * scale, y + m3.y * scale, z + m3.z * scale, uv3.u, uv3.v, color);
+
+            result.verts.push(vert1, vert2, vert3);
+            result.faces.push(new Face(vert1, vert2, vert3));
+        }
+    }
+
+    if (mesh)
+    {
+        mesh.faces = mesh.faces.concat(result.faces);
+        mesh.vertices = mesh.vertices.concat(result.vertices);
+    }
+
+    return result;
+};
+
+module.exports = GenerateObjVerts;