101 lines
4.0 KiB
C#
101 lines
4.0 KiB
C#
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#if UNITY_EDITOR
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using UnityEngine;
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using System.Collections.Generic;
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namespace GSpawn
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{
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public static class CircleMesh
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{
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public static Mesh createXY(float circleRadius, int numBorderPoints, Color color)
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{
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if (circleRadius < 1e-4f || numBorderPoints < 4) return null;
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int numVerts = numBorderPoints + 1;
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int numTriangles = numBorderPoints - 1;
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Vector3[] positions = new Vector3[numBorderPoints + 1];
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Vector3[] normals = new Vector3[positions.Length];
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int[] indices = new int[numTriangles * 3];
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int indexPtr = 0;
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positions[0] = Vector3.zero;
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float angleStep = 360.0f / (numBorderPoints - 1);
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for (int ptIndex = 0; ptIndex < numBorderPoints; ++ptIndex)
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{
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float angle = angleStep * ptIndex * Mathf.Deg2Rad;
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int vertIndex = ptIndex + 1;
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positions[vertIndex] = new Vector3(Mathf.Sin(angle) * circleRadius, Mathf.Cos(angle) * circleRadius, 0.0f);
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normals[vertIndex] = Vector3.forward;
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}
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for (int vertIndex = 1; vertIndex < numVerts - 1; ++vertIndex)
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{
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indices[indexPtr++] = 0;
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indices[indexPtr++] = vertIndex;
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indices[indexPtr++] = vertIndex + 1;
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}
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Mesh mesh = new Mesh();
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mesh.vertices = positions;
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mesh.colors = ColorEx.createFilledColorArray(positions.Length, color);
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mesh.normals = normals;
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mesh.SetIndices(indices, MeshTopology.Triangles, 0);
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mesh.UploadMeshData(false);
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return mesh;
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}
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public static Mesh createWireXY(float circleRadius, int numBorderPoints, Color color)
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{
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if (circleRadius < 1e-4f || numBorderPoints < 4) return null;
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Vector3[] positions = new Vector3[numBorderPoints];
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int[] indices = new int[numBorderPoints];
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float angleStep = 360.0f / (numBorderPoints - 1);
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for (int ptIndex = 0; ptIndex < numBorderPoints; ++ptIndex)
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{
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float angle = angleStep * ptIndex * Mathf.Deg2Rad;
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positions[ptIndex] = new Vector3(Mathf.Sin(angle) * circleRadius, Mathf.Cos(angle) * circleRadius, 0.0f);
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indices[ptIndex] = ptIndex;
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}
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Mesh mesh = new Mesh();
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mesh.vertices = positions;
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mesh.colors = ColorEx.createFilledColorArray(numBorderPoints, color);
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mesh.SetIndices(indices, MeshTopology.LineStrip, 0);
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mesh.UploadMeshData(false);
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return mesh;
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}
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public static void generateXYCirclePointsCW(Vector3 circleCenter, float circleRadius, int numPoints, List<Vector3> points)
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{
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points.Clear();
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numPoints = Mathf.Max(numPoints, 3);
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float angleStep = 360.0f / (numPoints - 1);
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for (int ptIndex = 0; ptIndex < numPoints; ++ptIndex)
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{
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float angle = angleStep * ptIndex * Mathf.Deg2Rad;
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points.Add(new Vector3(circleCenter.x + Mathf.Cos(angle) * circleRadius, circleCenter.y + Mathf.Sin(angle) * circleRadius, circleCenter.z));
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}
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}
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public static void generateXYCirclePointsCW(Vector3 circleCenter, float circleRadius, Vector3 circleU, Vector3 circleV, int numPoints, List<Vector3> points)
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{
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points.Clear();
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numPoints = Mathf.Max(numPoints, 3);
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float angleStep = 360.0f / (numPoints - 1);
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for (int ptIndex = 0; ptIndex < numPoints; ++ptIndex)
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{
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float angle = angleStep * ptIndex * Mathf.Deg2Rad;
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points.Add(circleCenter + circleU * Mathf.Cos(angle) * circleRadius + circleV * Mathf.Sin(angle) * circleRadius);
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}
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}
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}
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}
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#endif
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