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@@ -0,0 +1,152 @@
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+using System.Collections;
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+using System.Collections.Generic;
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+using UnityEngine;
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+
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+namespace KairoEngine.Utility
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+{
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+ public static class MeshUtils {
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+
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+ private static readonly Vector3 Vector3zero = Vector3.zero;
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+ private static readonly Vector3 Vector3one = Vector3.one;
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+ private static readonly Vector3 Vector3yDown = new Vector3(0,-1);
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+
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+
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+ private static Quaternion[] cachedQuaternionEulerArr;
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+ private static void CacheQuaternionEuler() {
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+ if (cachedQuaternionEulerArr != null) return;
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+ cachedQuaternionEulerArr = new Quaternion[360];
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+ for (int i=0; i<360; i++) {
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+ cachedQuaternionEulerArr[i] = Quaternion.Euler(0,0,i);
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+ }
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+ }
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+ private static Quaternion GetQuaternionEuler(float rotFloat) {
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+ int rot = Mathf.RoundToInt(rotFloat);
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+ rot = rot % 360;
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+ if (rot < 0) rot += 360;
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+ //if (rot >= 360) rot -= 360;
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+ if (cachedQuaternionEulerArr == null) CacheQuaternionEuler();
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+ return cachedQuaternionEulerArr[rot];
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+ }
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+
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+
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+ public static Mesh CreateEmptyMesh() {
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+ Mesh mesh = new Mesh();
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+ mesh.vertices = new Vector3[0];
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+ mesh.uv = new Vector2[0];
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+ mesh.triangles = new int[0];
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+ return mesh;
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+ }
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+
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+ public static void CreateEmptyMeshArrays(int quadCount, out Vector3[] vertices, out Vector2[] uvs, out int[] triangles) {
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+ vertices = new Vector3[4 * quadCount];
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+ uvs = new Vector2[4 * quadCount];
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+ triangles = new int[6 * quadCount];
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+ }
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+
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+ public static Mesh CreateMesh(Vector3 pos, float rot, Vector3 baseSize, Vector2 uv00, Vector2 uv11) {
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+ return AddToMesh(null, pos, rot, baseSize, uv00, uv11);
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+ }
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+
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+ public static Mesh AddToMesh(Mesh mesh, Vector3 pos, float rot, Vector3 baseSize, Vector2 uv00, Vector2 uv11) {
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+ if (mesh == null) {
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+ mesh = CreateEmptyMesh();
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+ }
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+ Vector3[] vertices = new Vector3[4 + mesh.vertices.Length];
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+ Vector2[] uvs = new Vector2[4 + mesh.uv.Length];
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+ int[] triangles = new int[6 + mesh.triangles.Length];
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+
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+ mesh.vertices.CopyTo(vertices, 0);
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+ mesh.uv.CopyTo(uvs, 0);
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+ mesh.triangles.CopyTo(triangles, 0);
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+
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+ int index = vertices.Length / 4 - 1;
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+ //Relocate vertices
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+ int vIndex = index*4;
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+ int vIndex0 = vIndex;
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+ int vIndex1 = vIndex+1;
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+ int vIndex2 = vIndex+2;
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+ int vIndex3 = vIndex+3;
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+
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+ baseSize *= .5f;
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+
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+ bool skewed = baseSize.x != baseSize.y;
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+ if (skewed) {
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+ vertices[vIndex0] = pos+GetQuaternionEuler(rot)*new Vector3(-baseSize.x, baseSize.y);
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+ vertices[vIndex1] = pos+GetQuaternionEuler(rot)*new Vector3(-baseSize.x, -baseSize.y);
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+ vertices[vIndex2] = pos+GetQuaternionEuler(rot)*new Vector3( baseSize.x, -baseSize.y);
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+ vertices[vIndex3] = pos+GetQuaternionEuler(rot)*baseSize;
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+ } else {
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+ vertices[vIndex0] = pos+GetQuaternionEuler(rot-270)*baseSize;
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+ vertices[vIndex1] = pos+GetQuaternionEuler(rot-180)*baseSize;
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+ vertices[vIndex2] = pos+GetQuaternionEuler(rot- 90)*baseSize;
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+ vertices[vIndex3] = pos+GetQuaternionEuler(rot- 0)*baseSize;
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+ }
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+
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+ //Relocate UVs
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+ uvs[vIndex0] = new Vector2(uv00.x, uv11.y);
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+ uvs[vIndex1] = new Vector2(uv00.x, uv00.y);
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+ uvs[vIndex2] = new Vector2(uv11.x, uv00.y);
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+ uvs[vIndex3] = new Vector2(uv11.x, uv11.y);
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+
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+ //Create triangles
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+ int tIndex = index*6;
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+
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+ triangles[tIndex+0] = vIndex0;
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+ triangles[tIndex+1] = vIndex3;
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+ triangles[tIndex+2] = vIndex1;
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+
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+ triangles[tIndex+3] = vIndex1;
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+ triangles[tIndex+4] = vIndex3;
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+ triangles[tIndex+5] = vIndex2;
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+
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+ mesh.vertices = vertices;
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+ mesh.triangles = triangles;
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+ mesh.uv = uvs;
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+
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+ //mesh.bounds = bounds;
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+
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+ return mesh;
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+ }
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+
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+ public static void AddToMeshArrays(Vector3[] vertices, Vector2[] uvs, int[] triangles, int index, Vector3 pos, float rot, Vector3 baseSize, Vector2 uv00, Vector2 uv11) {
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+ //Relocate vertices
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+ int vIndex = index*4;
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+ int vIndex0 = vIndex;
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+ int vIndex1 = vIndex+1;
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+ int vIndex2 = vIndex+2;
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+ int vIndex3 = vIndex+3;
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+
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+ baseSize *= .5f;
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+
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+ bool skewed = baseSize.x != baseSize.y;
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+ if (skewed) {
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+ vertices[vIndex0] = pos+GetQuaternionEuler(rot)*new Vector3(-baseSize.x, 0, baseSize.z);
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+ vertices[vIndex1] = pos+GetQuaternionEuler(rot)*new Vector3(-baseSize.x, 0, -baseSize.z);
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+ vertices[vIndex2] = pos+GetQuaternionEuler(rot)*new Vector3( baseSize.x, 0, -baseSize.z);
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+ vertices[vIndex3] = pos+GetQuaternionEuler(rot)*baseSize;
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+ } else {
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+ vertices[vIndex0] = pos+GetQuaternionEuler(rot-270)*baseSize;
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+ vertices[vIndex1] = pos+GetQuaternionEuler(rot-180)*baseSize;
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+ vertices[vIndex2] = pos+GetQuaternionEuler(rot- 90)*baseSize;
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+ vertices[vIndex3] = pos+GetQuaternionEuler(rot- 0)*baseSize;
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+ }
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+
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+ //Relocate UVs
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+ uvs[vIndex0] = new Vector2(uv00.x, uv11.y);
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+ uvs[vIndex1] = new Vector2(uv00.x, uv00.y);
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+ uvs[vIndex2] = new Vector2(uv11.x, uv00.y);
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+ uvs[vIndex3] = new Vector2(uv11.x, uv11.y);
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+
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+ //Create triangles
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+ int tIndex = index*6;
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+
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+ triangles[tIndex+0] = vIndex0;
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+ triangles[tIndex+1] = vIndex3;
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+ triangles[tIndex+2] = vIndex1;
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+
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+ triangles[tIndex+3] = vIndex1;
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+ triangles[tIndex+4] = vIndex3;
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+ triangles[tIndex+5] = vIndex2;
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+ }
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+ }
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+}
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