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40 lines
1.6 KiB
40 lines
1.6 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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namespace Utility.Meshes
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{
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public static class Curve
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{
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// Could do this on the GPU
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public static Vector3[] CurveVertices(Vector3[] vertices, Vector3 ringCentre, Vector3 Axis, Transform origin, Vector3 meshCentre)
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{
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Vector3[] curvedVertices = new Vector3[vertices.Length];
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Vector3 down = Vector3.ProjectOnPlane(meshCentre - ringCentre, Axis).normalized;
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Vector3 perpendicular = Vector3.Cross(Axis, down).normalized;
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float radius = Vector3.ProjectOnPlane(meshCentre - ringCentre, Axis).magnitude;
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for (int i = 0; i < vertices.Length; i++)
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{
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Vector3 position = origin.TransformPoint(vertices[i]);
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Vector3 directionFromCentre = Vector3.Project(position - meshCentre, perpendicular);
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Vector3 directionAlongAxis = Vector3.Project(position - ringCentre, Axis);
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float vertexRadius = Vector3.Project(position - ringCentre, down).magnitude;
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float arcLength = directionFromCentre.magnitude;
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float angle = (arcLength / radius);
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if (Vector3.Dot(directionFromCentre, perpendicular) < 0)
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angle = -angle;
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Vector3 curvedDirection = Quaternion.AngleAxis(Mathf.Rad2Deg * angle, Axis) * down;
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curvedVertices[i] = origin.InverseTransformPoint(ringCentre + (curvedDirection.normalized * (vertexRadius)) + directionAlongAxis);
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}
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return curvedVertices;
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}
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}
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}
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