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118 lines
2.8 KiB
118 lines
2.8 KiB
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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[ExecuteInEditMode]
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public class PlanetRing : MonoBehaviour
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{
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//manual settings
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[Range(3, 360)]
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public int segments = 3;
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public float innerRadius = 0.7f;
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public float thickness = 0.5f;
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public Material ringMat;
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//cached references
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GameObject ring;
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Mesh ringMesh;
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MeshFilter ringMF;
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MeshRenderer ringMR;
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void OnEnable()
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{
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if (ring == null || ringMesh == null)
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{
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SetUpRing();
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}
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BuildRingMesh();
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}
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void OnValidate()
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{
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if (ring == null || ringMesh == null)
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{
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SetUpRing();
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}
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BuildRingMesh();
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}
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void SetUpRing()
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{
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//check if ring is null and there are no children
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if (ring == null && transform.childCount == 0)
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{
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//create ring object
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ring = new GameObject(name + " Ring");
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ring.transform.parent = transform;
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ring.transform.SetAsFirstSibling();
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ring.transform.localScale = Vector3.one;
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ring.transform.localPosition = Vector3.zero;
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ring.transform.localRotation = Quaternion.identity;
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ringMF = ring.AddComponent<MeshFilter>();
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ringMR = ring.AddComponent<MeshRenderer>();
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ringMR.material = ringMat;
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}
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else
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{
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ring = transform.GetChild(0).gameObject;
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ringMF = ring.GetComponent<MeshFilter>();
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ringMR = ring.GetComponent<MeshRenderer>();
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}
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ringMesh = new Mesh();
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ringMF.sharedMesh = ringMesh;
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}
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void BuildRingMesh()
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{
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//build ring mesh
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Vector3[] vertices = new Vector3[(segments + 1) * 2 * 2];
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int[] triangles = new int[segments * 6 * 2];
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Vector2[] uv = new Vector2[(segments + 1) * 2 * 2];
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int halfway = (segments + 1) * 2;
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for (int i = 0; i < segments + 1; i++)
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{
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float progress = (float)i / (float)segments;
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float angle = Mathf.Deg2Rad * progress * 360;
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float x = Mathf.Sin(angle);
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float z = Mathf.Cos(angle);
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vertices[i * 2] = vertices[i * 2 + halfway] = new Vector3(x, 0f, z) * (innerRadius + thickness);
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vertices[i * 2 + 1] = vertices[i * 2 + 1 + halfway] = new Vector3(x, 0f, z) * innerRadius;
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uv[i * 2] = uv[i * 2 + halfway] = new Vector2(progress, 0f);
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uv[i * 2 + 1] = uv[i * 2 + 1 + halfway] = new Vector2(progress, 1f);
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if (i != segments)
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{
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triangles[i * 12] = i * 2;
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triangles[i * 12 + 1] = triangles[i * 12 + 4] = (i + 1) * 2;
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triangles[i * 12 + 2] = triangles[i * 12 + 3] = i * 2 + 1;
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triangles[i * 12 + 5] = (i + 1) * 2 + 1;
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triangles[i * 12 + 6] = i * 2 + halfway;
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triangles[i * 12 + 7] = triangles[i * 12 + 10] = i * 2 + 1 + halfway;
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triangles[i * 12 + 8] = triangles[i * 12 + 9] = (i + 1) * 2 + halfway;
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triangles[i * 12 + 11] = (i + 1) * 2 + 1 + halfway;
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}
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}
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if (vertices.Length < ringMesh.vertices.Length)
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{
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ringMesh.triangles = triangles;
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ringMesh.vertices = vertices;
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}
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else
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{
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ringMesh.vertices = vertices;
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ringMesh.triangles = triangles;
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}
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ringMesh.uv = uv;
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ringMesh.RecalculateNormals();
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}
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}
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