pastemyst | (untitled)

(untitled)

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public class SphereMesh
    {
        public Mesh Mesh => new Mesh()
        {
            vertices = Vertices,
            normals = Normals,
            triangles = Triangles,
            uv = UVs
        };

public readonly Vector3[] Vertices;
        public readonly Vector3[] Normals;
        public readonly Vector2[] UVs;
        public readonly int[] Triangles;

private readonly int latitudeLines;
        private readonly int longitudeLines;

private const float PI = 3.14159265f;

public SphereMesh(Vector2Int resolution)
        {
            this.latitudeLines = resolution.x;
            this.longitudeLines = resolution.y;

Vertices = GenerateVertices(out UVs);
            Normals = GenerateNormals();
            Triangles = GenerateTriangles();
        }

private Vector3[] GenerateVertices(out Vector2[] uvs)
        {
            Vector3[] vertices = new Vector3[latitudeLines * longitudeLines];
            Vector2[] nUVs = new Vector2[latitudeLines * longitudeLines];

int vertexIndex = 0;
            for (int y = 0; y < latitudeLines; y++)
            {
                float latitude = Mathf.Lerp(-PI, PI, (float)y / (latitudeLines - 1));
                for (int x = 0; x < longitudeLines; x++)
                {
                    float longitude = Mathf.Lerp(-PI, PI, (float)x / (longitudeLines - 1));

Vector3 vertex = new()
                    {
                        x = Mathf.Cos(latitude) * Mathf.Cos(longitude),
                        y = Mathf.Sin(latitude),
                        z = Mathf.Cos(latitude) * Mathf.Sin(longitude),
                    };

Vector2 uv = new()
                    {
                        x = (float)x / (longitudeLines - 1),
                        y = (float)y / (latitudeLines - 1),
                    };

vertices[vertexIndex] = vertex;
                    nUVs[vertexIndex] = uv;

vertexIndex += 1;
                }
            }

uvs = nUVs;

return vertices;
        }

private Vector3[] GenerateNormals()
        {
            Vector3[] normals = new Vector3[Vertices.Length];
            for (int i = 0; i < Vertices.Length; i++)
            {
                normals[i] = Vertices[i];
            }

return normals;
        }

private int[] GenerateTriangles()
        {
            int triangleIndex = 0;
            int[] triangles = new int[(latitudeLines - 1) * (longitudeLines - 1) * 6];

for (int y = 0; y < latitudeLines - 1; y++)
            {
                int offset = y * longitudeLines;
                for (int x = 0; x < longitudeLines - 1; x++)
                {
                    int index = offset + x;

triangles[triangleIndex++] = index;
                    triangles[triangleIndex++] = index + longitudeLines;
                    triangles[triangleIndex++] = index + longitudeLines + 1;

triangles[triangleIndex++] = index + longitudeLines + 1;
                    triangles[triangleIndex++] = index + 1;
                    triangles[triangleIndex++] = index;
                }
            }

return triangles;
        }
    }

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