update sample

Assets/Scenes/SampleCurvedText/Scripts/Rotator.cs

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+using UnityEngine;
+
+namespace space.chikalin.textdecal
+{
+public class Rotator : MonoBehaviour
+{
+    [Range(1f, 100f)] public float speed = 30f;
+
+    private void Update()
+    {
+        transform.Rotate(Vector3.up, Time.deltaTime * speed);
+    }
+}
+}

Assets/Scenes/SampleCurvedText/Scripts/Rotator.cs.meta

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+fileFormatVersion: 2
+guid: 86d5f4391de14e74aa3dc0b7649c414c

Assets/Scenes/SampleCurvedText/Scripts/TextMeshProSpline.cs

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+using System.Linq;
+using TMPro;
+using Unity.Mathematics;
+using UnityEngine;
+using UnityEngine.Splines;
+
+namespace space.chikalin.textdecal
+{
+/// <summary>
+///
+/// Should execute after <c>space.chikalin.textdecal.TextMeshProDecal</c> script
+/// </summary>
+[ExecuteAlways]
+[DisallowMultipleComponent]
+[DefaultExecutionOrder(-90)]
+[AddComponentMenu("Mesh/TextMeshPro - Spline")]
+#if UNITY_2021_2_OR_NEWER
+[Icon("Packages/com.unity.splines/Editor/Resources/Icons/SplineComponent.png")]
+#endif
+[RequireComponent(typeof(SplineContainer), typeof(TMP_Text))]
+public class TextMeshProSpline : MonoBehaviour
+{
+    private TMP_Text _text;
+    private SplineContainer _spline;
+
+    private Spline DefaultSpline(float3 start, float3 end)
+    {
+        var spline = new Spline
+        {
+            { start, TangentMode.Linear },
+            { end, TangentMode.Linear }
+        };
+        return spline;
+    }
+
+    private void Awake()
+    {
+        _text = GetComponent<TMP_Text>();
+        _spline = GetComponent<SplineContainer>();
+    }
+
+    private void OnEnable()
+    {
+        _text.OnPreRenderText += OnPreRenderText;
+    }
+
+    private void OnDisable()
+    {
+        _text.OnPreRenderText -= OnPreRenderText;
+        _text.ClearMesh();
+        _text.mesh.RecalculateBounds();
+        _text.ForceMeshUpdate();
+    }
+
+    private void OnPreRenderText(TMP_TextInfo textInfo)
+    {
+        FitSpline(textInfo);
+    }
+
+    private void FitSpline(TMP_TextInfo textInfo)
+    {
+        FixSpline();
+
+        var splineLength = _spline.CalculateLength();
+        if (splineLength <= 0) return;
+
+        for (var i = 0; i < textInfo.characterCount; i++)
+        {
+            if (!textInfo.characterInfo[i].isVisible)
+                continue;
+
+            var vertexIndex = textInfo.characterInfo[i].vertexIndex;
+            var materialIndex = textInfo.characterInfo[i].materialReferenceIndex;
+            var vertices = textInfo.meshInfo[materialIndex].vertices;
+            var bl = vertices[vertexIndex + 0];
+            var tr = vertices[vertexIndex + 2];
+            var charCenter = bl + (tr - bl) / 2;
+            Evaluate(splineLength, charCenter.x, out var position, out var xAxis, out var yAxis);
+            xAxis = transform.InverseTransformDirection(math.normalize(xAxis));
+            yAxis = transform.InverseTransformDirection(math.normalize(yAxis));
+            position = transform.InverseTransformPoint(position);
+            var newCenter = position + yAxis * charCenter.y;
+            for (var v = 0; v < 4; v++)
+            {
+                var d = vertices[vertexIndex + v] - charCenter;
+                vertices[vertexIndex + v] = newCenter + xAxis * d.x + yAxis * d.y;
+            }
+        }
+    }
+
+    private void FixSpline()
+    {
+        var textRectTransform = _text.rectTransform;
+        if (_spline.Spline.Count >= 2) return;
+        var rect = textRectTransform.rect;
+        var position = textRectTransform.position;
+        var start = new float3(rect.xMin, rect.yMin, position.z);
+        var end = new float3(rect.xMax, rect.yMax, position.z);
+        _spline.Spline = DefaultSpline(start, end);
+    }
+
+    private void Evaluate(float length, float xPos, out float3 position, out float3 xAxis, out float3 yAxis)
+    {
+        var s = (xPos / length) * transform.localScale.x + .5f; // centered
+        _spline.Evaluate(math.clamp(s, 0.01f, .99f), out position, out xAxis, out yAxis);
+    }
+
+    private Quaternion ReflectRotation(Quaternion source, Vector3 normal)
+    {
+        return Quaternion.LookRotation(Vector3.Reflect(source * Vector3.forward, normal),
+            Vector3.Reflect(source * Vector3.up, normal));
+    }
+
+#if UNITY_EDITOR
+    [ExecuteAlways]
+    [ContextMenu("Mirror")]
+    public void Mirror()
+    {
+        var rectTransform = _text.rectTransform;
+        rectTransform.GetPositionAndRotation(out var position, out var rotation);
+        var max = position + _text.transform.right * rectTransform.rect.width * rectTransform.localScale.x;
+        max.x = -max.x;
+        var angles = rotation.eulerAngles;
+        rotation = Quaternion.Euler(angles.x, 180 - (angles.y - 180), -angles.z);
+        rectTransform.SetPositionAndRotation(max, rotation);
+
+        var spline = _spline.Splines[0];
+        var array = spline.Knots.ToArray();
+        var lastX = array[^1].Position.x;
+        var r = array.Length - 1;
+        for (int i = 0; i < array.Length; i++)
+        {
+            var knot = array[i];
+            knot.Position.x = -knot.Position.x + lastX;
+            spline.SetKnot(r - i, knot);
+        }
+    }
+#endif
+    
+#if UNITY_EDITOR
+    private void OnValidate()
+    {
+        ForceUpdate();
+    }
+#endif
+
+    [ExecuteAlways]
+    public void ForceUpdate()
+    {
+        if (_text != null)
+        {
+            _text.ForceMeshUpdate();
+        }
+    }
+}
+}

Assets/Scenes/SampleCurvedText/Scripts/TextMeshProSpline.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 05798bd8f0b876340941273f09bab577

Assets/Scenes/SampleCurvedText/Scripts/space.chikalin.textdecal.SampleCurvedText.asmdef

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+{
+    "name": "space.chikalin.textdecal.SampleCurvedText",
+    "rootNamespace": "",
+    "references": [
+        "GUID:6055be8ebefd69e48b49212b09b47b2f",
+        "GUID:21d1eb854b91ade49bc69a263d12bee2",
+        "GUID:d8b63aba1907145bea998dd612889d6b"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Assets/Scenes/SampleCurvedText/Scripts/space.chikalin.textdecal.SampleCurvedText.asmdef.meta

@@ -0,0 +1,7 @@
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+guid: dd71501f22a1b524ab1b3b104b75b75e
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+  externalObjects: {}
+  userData: 
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