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99 lines
3.0 KiB
99 lines
3.0 KiB
using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using UnityEngine;
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public class MeshCurver : MonoBehaviour
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{
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[Header("References")]
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[SerializeField]
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private RotationController m_pivot;
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[Header("Settings")]
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[SerializeField]
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private bool m_ApplyAtStart = true;
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[SerializeField]
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private bool m_UpdateCollider = true;
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[Header("Debug")]
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[SerializeField]
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private bool m_CalculateEachUpdate = false;
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private Mesh m_startMesh;
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private MeshFilter m_meshFilter;
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private MeshCollider m_meshCollider;
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private void Start()
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{
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m_meshFilter = GetComponent<MeshFilter>();
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m_meshCollider = GetComponent<MeshCollider>();
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m_startMesh = m_meshFilter.mesh;
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if (m_ApplyAtStart)
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UpdateMesh();
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}
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private void Update()
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{
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if (m_CalculateEachUpdate)
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UpdateMesh();
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}
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[ContextMenu("Update Mesh")]
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public void UpdateMesh()
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{
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Mesh newMesh = UpdateMesh(m_pivot.Position, m_startMesh, m_pivot.RotationAxis, transform);
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m_meshFilter.mesh = newMesh;
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if (m_meshCollider != null && m_UpdateCollider)
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m_meshCollider.sharedMesh = newMesh;
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}
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public Mesh UpdateMesh(Vector3 centre, Mesh mesh, Vector3 Axis, Transform origin)
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{
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List<Vector3> transformedVertices = new List<Vector3>();
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Vector3[] vertices = mesh.vertices;
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Vector3 closestPoint = origin.TransformPoint(vertices.OrderBy(p => Vector3.Distance(centre, origin.TransformPoint(p))).First());
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Vector3 direction = closestPoint - centre;
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Vector3 perpendicular = Vector3.Cross(Axis, direction).normalized;
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Debug.DrawLine(centre, closestPoint, Color.red);
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float radius = direction.magnitude;
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foreach (Vector3 vertex in vertices)
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{
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Vector3 worldPosition = origin.TransformPoint(vertex);
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Vector3 directionFromStartPoint = Vector3.ProjectOnPlane(worldPosition - closestPoint, Axis);
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Vector3 planeOffset = Vector3.Project(worldPosition - closestPoint, Axis);
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float heightOffset = radius - Vector3.Project(worldPosition-centre,direction.normalized).magnitude;
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float arcLength = directionFromStartPoint.magnitude;
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float angle = (arcLength / radius);
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if (Vector3.Dot(directionFromStartPoint, perpendicular) < 0)
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angle = -angle;
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Vector3 directionFromCentre = Quaternion.AngleAxis(Mathf.Rad2Deg * angle, Axis) * ((direction));
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transformedVertices.Add((origin.InverseTransformPoint(centre + directionFromCentre.normalized * (radius - heightOffset) + planeOffset)));
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}
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Mesh retVal = new Mesh();
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retVal.vertices = transformedVertices.ToArray();
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retVal.triangles = mesh.triangles;
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retVal.uv = mesh.uv;
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retVal.RecalculateNormals();
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retVal.RecalculateTangents();
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retVal.RecalculateBounds();
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return retVal;
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}
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}
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