+using FalcoEngine;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+public class MeshGenerator : MonoBehaviour
+{
+ public Material material1;
+ public Material material2;
+
+ public Slider segmentsSlider;
+ public Text segmentsText;
+
+ GameObject sphere = null;
+ GameObject cube = null;
+
+ MeshRenderer sphereMeshRenderer = null;
+ Mesh sphereMesh = null;
+
+ MeshRenderer cubeMeshRenderer = null;
+ Mesh cubeMesh = null;
+
+ void Start()
+ {
+ //Sphere
+ sphere = new GameObject();
+ sphere.transform.position = transform.position + new Vector3(3, 0, 0);
+ sphere.transform.scale = new Vector3(1.8f, 1.8f, 1.8f);
+
+ sphereMeshRenderer = sphere.AddComponent<MeshRenderer>();
+ sphereMesh = new Mesh();
+
+ RebuildSphere(sphereMesh, 24);
+
+ //Cube
+ cube = new GameObject();
+ cube.transform.position = transform.position + new Vector3(-3, 0, 0);
+ cube.transform.scale = new Vector3(1.5f, 1.5f, 1.5f);
+
+ cubeMeshRenderer = cube.AddComponent<MeshRenderer>();
+ cubeMesh = new Mesh();
+
+ RebuildCube(cubeMesh);
+
+ //UI
+ segmentsSlider.SetProgress(24 / 100.0f);
+ segmentsSlider.OnChange += SegmentsSlider_OnChange;
+ }
+
+ private void SegmentsSlider_OnChange(float value)
+ {
+ int count = (int)(value * 100.0f);
+
+ segmentsText.text = count.ToString();
+ RebuildSphere(sphereMesh, count);
+ }
+
+ void Update()
+ {
+ float speed = 20.0f * Time.deltaTime;
+ sphere.transform.rotation *= Quaternion.Euler(speed, 0.0f, speed);
+ cube.transform.rotation *= Quaternion.Euler(speed, 0.0f, speed);
+ }
+
+ void CalculateTangentSpace(List<int> indices, List<Vector3> vertices, List<Vector3> normals, List<Vector3> tangents, List<Vector3> bitangents, List<Vector2> texCoords)
+ {
+ //Calculate normals + tangents + bitangents
+ for (int i = 0; i < indices.Count; i += 3)
+ {
+ //Normals
+ int id0 = indices[i + 0];
+ int id1 = indices[i + 1];
+ int id2 = indices[i + 2];
+
+ Vector3 v1 = vertices[id0];
+ Vector3 v2 = vertices[id1];
+ Vector3 v3 = vertices[id2];
+
+ Vector3 normalA = Vector3.Normalize(Vector3.Cross(v2 — v1, v3 — v1));
+
+ normals[id0] = normalA;
+ normals[id1] = normalA;
+ normals[id2] = normalA;
+
+ //Tangent space
+ Vector3 deltaPos = Vector3.zero;
+ if (v1 == v2)
+ deltaPos = v3 — v1;
+ else
+ deltaPos = v2 — v1;
+
+ Vector2 uv0 = texCoords[id0];
+ Vector2 uv1 = texCoords[id1];
+
+ Vector2 deltaUV1 = uv1 — uv0;
+
+ Vector3 tan = Vector3.zero; // tangent
+ Vector3 bin = Vector3.zero; // binormal
+
+ // avoid divion with 0
+ if (deltaUV1.x != 0)
+ tan = deltaPos / deltaUV1.x;
+ else
+ tan = deltaPos / 1.0f;
+
+ tan = Vector3.Normalize(tan — Vector3.Dot(normalA, tan) * normalA);
+ bin = Vector3.Normalize(Vector3.Cross(tan, normalA));
+
+ tangents[id0] = tan;
+ bitangents[id0] = bin;
+ tangents[id1] = tan;
+ bitangents[id1] = bin;
+ tangents[id2] = tan;
+ bitangents[id2] = bin;
+ }
+ }
+
+ void RebuildSphere(Mesh mesh, int size)
+ {
+ while (mesh.subMeshCount > 0)
+ {
+ mesh.GetSubMesh(0).Dispose();
+ mesh.RemoveSubMesh(0);
+ }
+
+ SubMesh subMesh = new SubMesh();
+
+ List<Vector3> vertices = new List<Vector3>();
+ List<Vector3> normals = new List<Vector3>();
+ List<Vector3> tangents = new List<Vector3>();
+ List<Vector3> bitangents = new List<Vector3>();
+ List<Vector2> texCoords = new List<Vector2>();
+
+ List<int> indices = new List<int>();
+
+ float radius = 1.0f;
+ int sectorCount = size;
+ int stackCount = size / 2;
+
+ float x, y, z, xy; // position
+ float s, t; // texCoord
+
+ float sectorStep = 2 * Mathf.PI / sectorCount;
+ float stackStep = Mathf.PI / stackCount;
+ float sectorAngle, stackAngle;
+
+ for (int i = 0; i <= stackCount; ++i)
+ {
+ stackAngle = Mathf.PI / 2 — i * stackStep;
+ xy = radius * Mathf.Cos(stackAngle);
+ z = radius * Mathf.Sin(stackAngle);
+
+ for (int j = 0; j <= sectorCount; ++j)
+ {
+ sectorAngle = j * sectorStep; // starting from 0 to 2pi
+
+ // vertex position (x, y, z)
+ x = xy * Mathf.Cos(sectorAngle);
+ y = xy * Mathf.Sin(sectorAngle);
+ vertices.Add(new Vector3(x, y, z));
+
+ // vertex tex coord (s, t) range between [0, 1]
+ s = (float)j / (float)sectorCount;
+ t = (float)i / (float)stackCount;
+ texCoords.Add(new Vector2(s, t));
+ }
+ }
+
+ int k1, k2;
+ for (int i = 0; i < stackCount; ++i)
+ {
+ k1 = i * (sectorCount + 1);
+ k2 = k1 + sectorCount + 1;
+
+ for (int j = 0; j < sectorCount; ++j, ++k1, ++k2)
+ {
+ if (i != 0)
+ {
+ indices.Add(k1);
+ indices.Add(k2);
+ indices.Add(k1 + 1);
+ }
+
+ // k1+1 => k2 => k2+1
+ if (i != (stackCount — 1))
+ {
+ indices.Add(k1 + 1);
+ indices.Add(k2);
+ indices.Add(k2 + 1);
+ }
+ }
+ }
+
+ normals.AddRange(new Vector3[vertices.Count]);
+ tangents.AddRange(new Vector3[vertices.Count]);
+ bitangents.AddRange(new Vector3[vertices.Count]);
+
+ CalculateTangentSpace(indices, vertices, normals, tangents, bitangents, texCoords);
+
+ subMesh.vertices = vertices.ToArray();
+ subMesh.normals = normals.ToArray();
+ subMesh.tangents = tangents.ToArray();
+ subMesh.bitangents = bitangents.ToArray();
+ subMesh.texcoords0 = texCoords.ToArray();
+ subMesh.indices = indices.ToArray();
+
+ vertices.Clear();
+ normals.Clear();
+ tangents.Clear();
+ bitangents.Clear();
+ texCoords.Clear();
+ indices.Clear();
+
+ mesh.AddSubMesh(subMesh);
+ mesh.Commit();
+
+ sphereMeshRenderer.mesh = mesh;
+ sphereMeshRenderer.SetSharedMaterial(0, material1);
+ }
+
+ void RebuildCube(Mesh mesh)
+ {
+ while (mesh.subMeshCount > 0)
+ {
+ mesh.GetSubMesh(0).Dispose();
+ mesh.RemoveSubMesh(0);
+ }
+
+ SubMesh subMesh = new SubMesh();
+
+ List<Vector3> vertices = new List<Vector3>(new Vector3[24]
+ {
+ new Vector3(-1.0f, 1.0f, 1.0f),
+ new Vector3( 1.0f, 1.0f, 1.0f),
+ new Vector3( -1.0f, -1.0f, 1.0f),
+ new Vector3( 1.0f, -1.0f, 1.0f),
+ new Vector3(-1.0f, 1.0f, -1.0f),
+ new Vector3(1.0f, 1.0f, -1.0f),
+ new Vector3(-1.0f, -1.0f, -1.0f),
+ new Vector3(1.0f, -1.0f, -1.0f),
+ new Vector3(-1.0f, 1.0f, 1.0f),
+ new Vector3(1.0f, 1.0f, 1.0f),
+ new Vector3(-1.0f, 1.0f, -1.0f),
+ new Vector3(1.0f, 1.0f, -1.0f),
+ new Vector3(-1.0f, -1.0f, 1.0f),
+ new Vector3(1.0f, -1.0f, 1.0f),
+ new Vector3(-1.0f, -1.0f, -1.0f),
+ new Vector3(1.0f, -1.0f, -1.0f),
+ new Vector3(1.0f, -1.0f, 1.0f),
+ new Vector3(1.0f, 1.0f, 1.0f),
+ new Vector3(1.0f, -1.0f, -1.0f),
+ new Vector3(1.0f, 1.0f, -1.0f),
+ new Vector3(-1.0f, -1.0f, 1.0f),
+ new Vector3(-1.0f, 1.0f, 1.0f),
+ new Vector3(-1.0f, -1.0f, -1.0f),
+ new Vector3(-1.0f, 1.0f, -1.0f),
+ });
+
+ List<Vector3> normals = new List<Vector3>();
+ List<Vector3> tangents = new List<Vector3>();
+ List<Vector3> bitangents = new List<Vector3>();
+ List<Vector2> texCoords = new List<Vector2>(new Vector2[24]
+ {
+ new Vector2(0, 0),
+ new Vector2(1, 0),
+ new Vector2(0, 1),
+ new Vector2(1, 1),
+ new Vector2(0, 0),
+ new Vector2(1, 0),
+ new Vector2(0, 1),
+ new Vector2(1, 1),
+ new Vector2(0, 0),
+ new Vector2(1, 0),
+ new Vector2(0, 1),
+ new Vector2(1, 1),
+ new Vector2(0, 0),
+ new Vector2(1, 0),
+ new Vector2(0, 1),
+ new Vector2(1, 1),
+ new Vector2(0, 0),
+ new Vector2(1, 0),
+ new Vector2(0, 1),
+ new Vector2(1, 1),
+ new Vector2(0, 0),
+ new Vector2(1, 0),
+ new Vector2(0, 1),
+ new Vector2(1, 1),
+ });
+
+ List<int> indices = new List<int>(new int[36]
+ {
+ 0, 2, 1,
+ 1, 2, 3,
+ 4, 5, 6,
+ 5, 7, 6,
+
+ 14, 15, 13,
+ 14, 13, 12,
+ 11, 10, 9,
+ 9, 10, 8,
+
+ 16, 18, 17,
+ 17, 18, 19,
+ 20, 21, 22,
+ 21, 23, 22,
+ });
+
+ normals.AddRange(new Vector3[vertices.Count]);
+ tangents.AddRange(new Vector3[vertices.Count]);
+ bitangents.AddRange(new Vector3[vertices.Count]);
+
+ CalculateTangentSpace(indices, vertices, normals, tangents, bitangents, texCoords);
+
+ subMesh.vertices = vertices.ToArray();
+ subMesh.normals = normals.ToArray();
+ subMesh.tangents = tangents.ToArray();
+ subMesh.bitangents = bitangents.ToArray();
+ subMesh.texcoords0 = texCoords.ToArray();
+ subMesh.indices = indices.ToArray();
+
+ vertices.Clear();
+ normals.Clear();
+ tangents.Clear();
+ bitangents.Clear();
+ texCoords.Clear();
+ indices.Clear();
+
+ mesh.AddSubMesh(subMesh);
+ mesh.Commit();
+
+ cubeMeshRenderer.mesh = mesh;
+ cubeMeshRenderer.SetSharedMaterial(0, material2);
+ }
+}