414 lines
20 KiB
C#
414 lines
20 KiB
C#
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using System;
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using Unity.Collections;
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using Unity.Mathematics;
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using UnityEngine.Rendering;
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namespace UnityEngine.Splines
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{
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/// <summary>
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/// Utility methods for creating and working with meshes.
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/// </summary>
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public static class SplineMesh
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{
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const float k_RadiusMin = .00001f, k_RadiusMax = 10000f;
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const int k_SidesMin = 3, k_SidesMax = 2084;
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const int k_SegmentsMin = 2, k_SegmentsMax = 4096;
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static readonly VertexAttributeDescriptor[] k_PipeVertexAttribs = new VertexAttributeDescriptor[]
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{
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new (VertexAttribute.Position),
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new (VertexAttribute.Normal),
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new (VertexAttribute.TexCoord0, dimension: 2)
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};
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/// <summary>
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/// Interface for Spline mesh vertex data. Implement this interface if you are extruding custom mesh data and
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/// do not want to use the vertex layout provided by <see cref="SplineMesh"/>."/>.
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/// </summary>
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public interface ISplineVertexData
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{
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/// <summary>
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/// Vertex position.
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/// </summary>
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public Vector3 position { get; set; }
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/// <summary>
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/// Vertex normal.
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/// </summary>
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public Vector3 normal { get; set; }
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/// <summary>
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/// Vertex texture, corresponds to UV0.
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/// </summary>
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public Vector2 texture { get; set; }
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}
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[System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
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struct VertexData : ISplineVertexData
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{
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public Vector3 position { get; set; }
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public Vector3 normal { get; set; }
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public Vector2 texture { get; set; }
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}
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static void ExtrudeRing<T, K>(T spline, float t, NativeArray<K> data, int start, int count, float radius)
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where T : ISpline
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where K : struct, ISplineVertexData
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{
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var evaluationT = spline.Closed ? math.frac(t) : math.clamp(t, 0f, 1f);
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spline.Evaluate(evaluationT, out var sp, out var st, out _);
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var length = math.lengthsq(st);
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if (length == 0f || float.IsNaN(length))
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st = spline.EvaluateTangent(math.clamp(evaluationT + (0.0001f * (t < 1f ? 1f : -1f)), 0f, 1f));
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st = math.normalize(st);
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var rot = Quaternion.LookRotation(st);
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var rad = math.radians(360f / count);
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for (int n = 0; n < count; ++n)
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{
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var vertex = new K();
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var p = new Vector3(math.cos(n * rad), math.sin(n * rad), 0f) * radius;
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vertex.position = (Vector3)sp + (rot * p);
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vertex.normal = (vertex.position - (Vector3)sp).normalized;
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// instead of inserting a seam, wrap UVs using a triangle wave so that texture wraps back onto itself
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float ut = n / ((float)count + count%2);
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float u = math.abs(ut - math.floor(ut + .5f)) * 2f;
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vertex.texture = new Vector2(u, t * spline.GetLength());
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data[start + n] = vertex;
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}
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}
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// The logic around when caps and closing is a little complicated and easy to confuse. This wraps settings in a
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// consistent way so that methods aren't working with mixed data.
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struct Settings
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{
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public int sides { get; private set; }
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public int segments { get; private set; }
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public bool capped { get; private set; }
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public bool closed { get; private set; }
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public float2 range { get; private set; }
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public float radius { get; private set; }
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public Settings(int sides, int segments, bool capped, bool closed, float2 range, float radius)
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{
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this.sides = math.clamp(sides, k_SidesMin, k_SidesMax);
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this.segments = math.clamp(segments, k_SegmentsMin, k_SegmentsMax);
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this.range = new float2(math.min(range.x, range.y), math.max(range.x, range.y));
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this.closed = math.abs(1f - (this.range.y - this.range.x)) < float.Epsilon && closed;
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this.capped = capped && !this.closed;
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this.radius = math.clamp(radius, k_RadiusMin, k_RadiusMax);
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}
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}
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/// <summary>
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/// Calculate the vertex and index count required for an extruded mesh.
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/// Use this method to allocate attribute and index buffers for use with Extrude.
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/// </summary>
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/// <param name="vertexCount">The number of vertices required for an extruded mesh using the provided settings.</param>
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/// <param name="indexCount">The number of indices required for an extruded mesh using the provided settings.</param>
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/// <param name="sides">How many sides make up the radius of the mesh.</param>
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/// <param name="segments">How many sections compose the length of the mesh.</param>
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/// <param name="range">
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/// The section of the Spline to extrude. This value expects a normalized interpolation start and end.
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/// I.e., [0,1] is the entire Spline, whereas [.5, 1] is the last half of the Spline.
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/// </param>
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/// <param name="capped">Whether the start and end of the mesh is filled. This setting is ignored when spline is closed.</param>
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/// <param name="closed">Whether the extruded mesh is closed or open. This can be separate from the Spline.Closed value.</param>
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public static void GetVertexAndIndexCount(int sides, int segments, bool capped, bool closed, Vector2 range, out int vertexCount, out int indexCount)
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{
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var settings = new Settings(sides, segments, capped, closed, range, 1f);
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GetVertexAndIndexCount(settings, out vertexCount, out indexCount);
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}
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static void GetVertexAndIndexCount(Settings settings, out int vertexCount, out int indexCount)
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{
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vertexCount = settings.sides * (settings.segments + (settings.capped ? 2 : 0));
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indexCount = settings.sides * 6 * (settings.segments - (settings.closed ? 0 : 1)) + (settings.capped ? (settings.sides - 2) * 3 * 2 : 0);
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}
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/// <summary>
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/// Extrude a mesh along a spline in a tube-like shape.
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/// </summary>
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/// <param name="spline">The spline to extrude.</param>
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/// <param name="mesh">A mesh that will be cleared and filled with vertex data for the shape.</param>
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/// <param name="radius">The radius of the extruded mesh.</param>
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/// <param name="sides">How many sides make up the radius of the mesh.</param>
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/// <param name="segments">How many sections compose the length of the mesh.</param>
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/// <param name="capped">Whether the start and end of the mesh is filled. This setting is ignored when spline is closed.</param>
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/// <typeparam name="T">A type implementing ISpline.</typeparam>
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public static void Extrude<T>(T spline, Mesh mesh, float radius, int sides, int segments, bool capped = true) where T : ISpline
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{
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Extrude(spline, mesh, radius, sides, segments, capped, new float2(0f, 1f));
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}
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/// <summary>
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/// Extrude a mesh along a spline in a tube-like shape.
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/// </summary>
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/// <param name="spline">The spline to extrude.</param>
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/// <param name="mesh">A mesh that will be cleared and filled with vertex data for the shape.</param>
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/// <param name="radius">The radius of the extruded mesh.</param>
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/// <param name="sides">How many sides make up the radius of the mesh.</param>
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/// <param name="segments">How many sections compose the length of the mesh.</param>
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/// <param name="capped">Whether the start and end of the mesh is filled. This setting is ignored when spline is closed.</param>
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/// <param name="range">
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/// The section of the Spline to extrude. This value expects a normalized interpolation start and end.
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/// I.e., [0,1] is the entire Spline, whereas [.5, 1] is the last half of the Spline.
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/// </param>
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/// <typeparam name="T">A type implementing ISpline.</typeparam>
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public static void Extrude<T>(T spline, Mesh mesh, float radius, int sides, int segments, bool capped, float2 range) where T : ISpline
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{
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var settings = new Settings(sides, segments, capped, spline.Closed, range, radius);
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GetVertexAndIndexCount(settings, out var vertexCount, out var indexCount);
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var meshDataArray = Mesh.AllocateWritableMeshData(1);
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var data = meshDataArray[0];
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var indexFormat = vertexCount >= ushort.MaxValue ? IndexFormat.UInt32 : IndexFormat.UInt16;
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data.SetIndexBufferParams(indexCount, indexFormat);
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data.SetVertexBufferParams(vertexCount, k_PipeVertexAttribs);
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var vertices = data.GetVertexData<VertexData>();
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if (indexFormat == IndexFormat.UInt16)
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{
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var indices = data.GetIndexData<UInt16>();
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Extrude(spline, vertices, indices, radius, sides, segments, capped, range);
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}
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else
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{
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var indices = data.GetIndexData<UInt32>();
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Extrude(spline, vertices, indices, radius, sides, segments, capped, range);
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}
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mesh.Clear();
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data.subMeshCount = 1;
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data.SetSubMesh(0, new SubMeshDescriptor(0, indexCount));
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Mesh.ApplyAndDisposeWritableMeshData(meshDataArray, mesh);
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mesh.RecalculateBounds();
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}
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/// <summary>
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/// Extrude a mesh along a spline in a tube-like shape.
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/// </summary>
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/// <param name="spline">The spline to extrude.</param>
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/// <param name="vertices">A pre-allocated buffer of vertex data.</param>
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/// <param name="indices">A pre-allocated index buffer. Must be of type UInt16 or UInt32.</param>
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/// <param name="radius">The radius of the extruded mesh.</param>
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/// <param name="sides">How many sides make up the radius of the mesh.</param>
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/// <param name="segments">How many sections compose the length of the mesh.</param>
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/// <param name="capped">Whether the start and end of the mesh is filled. This setting is ignored when spline
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/// is closed.</param>
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/// <param name="range">
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/// The section of the Spline to extrude. This value expects a normalized interpolation start and end.
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/// I.e., [0,1] is the entire Spline, whereas [.5, 1] is the last half of the Spline.
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/// </param>
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/// <typeparam name="TSplineType">A type implementing ISpline.</typeparam>
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/// <typeparam name="TVertexType">A type implementing ISplineVertexData.</typeparam>
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/// <typeparam name="TIndexType">The mesh index format. Must be UInt16 or UInt32.</typeparam>
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/// <exception cref="ArgumentOutOfRangeException">An out of range exception is thrown if the vertex or index
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/// buffer lengths do not match the expected size. Use <see cref="GetVertexAndIndexCount"/> to calculate the
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/// expected buffer sizes.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// An argument exception is thrown if {TIndexType} is not UInt16 or UInt32.
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/// </exception>
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public static void Extrude<TSplineType, TVertexType, TIndexType>(
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TSplineType spline,
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NativeArray<TVertexType> vertices,
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NativeArray<TIndexType> indices,
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float radius,
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int sides,
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int segments,
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bool capped,
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float2 range)
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where TSplineType : ISpline
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where TVertexType : struct, ISplineVertexData
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where TIndexType : struct
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{
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Extrude(spline, vertices, indices, new Settings(sides, segments, capped, spline.Closed, range, radius));
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}
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static void Extrude<TSplineType, TVertexType, TIndexType>(
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TSplineType spline,
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NativeArray<TVertexType> vertices,
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NativeArray<TIndexType> indices,
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Settings settings)
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where TSplineType : ISpline
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where TVertexType : struct, ISplineVertexData
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where TIndexType : struct
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{
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var radius = settings.radius;
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var sides = settings.sides;
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var segments = settings.segments;
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var range = settings.range;
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var capped = settings.capped;
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var closed = settings.closed;
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GetVertexAndIndexCount(settings, out var vertexCount, out var indexCount);
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if (sides < 3)
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throw new ArgumentOutOfRangeException(nameof(sides), "Sides must be greater than 3");
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if (segments < 2)
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throw new ArgumentOutOfRangeException(nameof(segments), "Segments must be greater than 2");
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if (vertices.Length != vertexCount)
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throw new ArgumentOutOfRangeException($"Vertex array is incorrect size. Expected {vertexCount}, but received {vertices.Length}.");
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if (indices.Length != indexCount)
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throw new ArgumentOutOfRangeException($"Index array is incorrect size. Expected {indexCount}, but received {indices.Length}.");
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if (typeof(TIndexType) == typeof(UInt16))
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{
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var ushortIndices = indices.Reinterpret<UInt16>();
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WindTris(ushortIndices, settings);
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}
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else if (typeof(TIndexType) == typeof(UInt32))
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{
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var ulongIndices = indices.Reinterpret<UInt32>();
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WindTris(ulongIndices, settings);
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}
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else
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{
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throw new ArgumentException("Indices must be UInt16 or UInt32", nameof(indices));
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}
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for (int i = 0; i < segments; ++i)
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ExtrudeRing(spline, math.lerp(range.x, range.y, i / (segments - 1f)), vertices, i * sides, sides, radius);
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if (capped)
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{
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var capVertexStart = segments * sides;
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var endCapVertexStart = (segments + 1) * sides;
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var rng = spline.Closed ? math.frac(range) : math.clamp(range, 0f, 1f);
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ExtrudeRing(spline, rng.x, vertices, capVertexStart, sides, radius);
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ExtrudeRing(spline, rng.y, vertices, endCapVertexStart, sides, radius);
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var beginAccel = math.normalize(spline.EvaluateTangent(rng.x));
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var accelLen = math.lengthsq(beginAccel);
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if (accelLen == 0f || float.IsNaN(accelLen))
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beginAccel = math.normalize(spline.EvaluateTangent(rng.x + 0.0001f));
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var endAccel = math.normalize(spline.EvaluateTangent(rng.y));
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accelLen = math.lengthsq(endAccel);
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if (accelLen == 0f || float.IsNaN(accelLen))
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endAccel = math.normalize(spline.EvaluateTangent(rng.y - 0.0001f));
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var rad = math.radians(360f / sides);
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var off = new float2(.5f, .5f);
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for (int i = 0; i < sides; ++i)
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{
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var v0 = vertices[capVertexStart + i];
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var v1 = vertices[endCapVertexStart + i];
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v0.normal = -beginAccel;
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v0.texture = off + new float2(math.cos(i * rad), math.sin(i * rad)) * .5f;
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v1.normal = endAccel;
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v1.texture = off + new float2(-math.cos(i * rad), math.sin(i * rad)) * .5f;
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vertices[capVertexStart + i] = v0;
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vertices[endCapVertexStart + i] = v1;
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}
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}
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}
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// Two overloads for winding triangles because there is no generic constraint for UInt{16, 32}
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static void WindTris(NativeArray<UInt16> indices, Settings settings)
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{
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var closed = settings.closed;
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var segments = settings.segments;
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var sides = settings.sides;
|
||
|
|
var capped = settings.capped;
|
||
|
|
|
||
|
|
for (int i = 0; i < (closed ? segments : segments - 1); ++i)
|
||
|
|
{
|
||
|
|
for (int n = 0; n < sides; ++n)
|
||
|
|
{
|
||
|
|
var index0 = i * sides + n;
|
||
|
|
var index1 = i * sides + ((n + 1) % sides);
|
||
|
|
var index2 = ((i+1) % segments) * sides + n;
|
||
|
|
var index3 = ((i+1) % segments) * sides + ((n + 1) % sides);
|
||
|
|
|
||
|
|
indices[i * sides * 6 + n * 6 + 0] = (UInt16) index0;
|
||
|
|
indices[i * sides * 6 + n * 6 + 1] = (UInt16) index1;
|
||
|
|
indices[i * sides * 6 + n * 6 + 2] = (UInt16) index2;
|
||
|
|
indices[i * sides * 6 + n * 6 + 3] = (UInt16) index1;
|
||
|
|
indices[i * sides * 6 + n * 6 + 4] = (UInt16) index3;
|
||
|
|
indices[i * sides * 6 + n * 6 + 5] = (UInt16) index2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (capped)
|
||
|
|
{
|
||
|
|
var capVertexStart = segments * sides;
|
||
|
|
var capIndexStart = sides * 6 * (segments-1);
|
||
|
|
var endCapVertexStart = (segments + 1) * sides;
|
||
|
|
var endCapIndexStart = (segments-1) * 6 * sides + (sides-2) * 3;
|
||
|
|
|
||
|
|
for(ushort i = 0; i < sides - 2; ++i)
|
||
|
|
{
|
||
|
|
indices[capIndexStart + i * 3 + 0] = (UInt16)(capVertexStart);
|
||
|
|
indices[capIndexStart + i * 3 + 1] = (UInt16)(capVertexStart + i + 2);
|
||
|
|
indices[capIndexStart + i * 3 + 2] = (UInt16)(capVertexStart + i + 1);
|
||
|
|
|
||
|
|
indices[endCapIndexStart + i * 3 + 0] = (UInt16) (endCapVertexStart);
|
||
|
|
indices[endCapIndexStart + i * 3 + 1] = (UInt16) (endCapVertexStart + i + 1);
|
||
|
|
indices[endCapIndexStart + i * 3 + 2] = (UInt16) (endCapVertexStart + i + 2);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Two overloads for winding triangles because there is no generic constraint for UInt{16, 32}
|
||
|
|
static void WindTris(NativeArray<UInt32> indices, Settings settings)
|
||
|
|
{
|
||
|
|
var closed = settings.closed;
|
||
|
|
var segments = settings.segments;
|
||
|
|
var sides = settings.sides;
|
||
|
|
var capped = settings.capped;
|
||
|
|
|
||
|
|
for (int i = 0; i < (closed ? segments : segments - 1); ++i)
|
||
|
|
{
|
||
|
|
for (int n = 0; n < sides; ++n)
|
||
|
|
{
|
||
|
|
var index0 = i * sides + n;
|
||
|
|
var index1 = i * sides + ((n + 1) % sides);
|
||
|
|
var index2 = ((i+1) % segments) * sides + n;
|
||
|
|
var index3 = ((i+1) % segments) * sides + ((n + 1) % sides);
|
||
|
|
|
||
|
|
indices[i * sides * 6 + n * 6 + 0] = (UInt32) index0;
|
||
|
|
indices[i * sides * 6 + n * 6 + 1] = (UInt32) index1;
|
||
|
|
indices[i * sides * 6 + n * 6 + 2] = (UInt32) index2;
|
||
|
|
indices[i * sides * 6 + n * 6 + 3] = (UInt32) index1;
|
||
|
|
indices[i * sides * 6 + n * 6 + 4] = (UInt32) index3;
|
||
|
|
indices[i * sides * 6 + n * 6 + 5] = (UInt32) index2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (capped)
|
||
|
|
{
|
||
|
|
var capVertexStart = segments * sides;
|
||
|
|
var capIndexStart = sides * 6 * (segments-1);
|
||
|
|
var endCapVertexStart = (segments + 1) * sides;
|
||
|
|
var endCapIndexStart = (segments-1) * 6 * sides + (sides-2) * 3;
|
||
|
|
|
||
|
|
for(ushort i = 0; i < sides - 2; ++i)
|
||
|
|
{
|
||
|
|
indices[capIndexStart + i * 3 + 0] = (UInt32)(capVertexStart);
|
||
|
|
indices[capIndexStart + i * 3 + 1] = (UInt32)(capVertexStart + i + 2);
|
||
|
|
indices[capIndexStart + i * 3 + 2] = (UInt32)(capVertexStart + i + 1);
|
||
|
|
|
||
|
|
indices[endCapIndexStart + i * 3 + 0] = (UInt32) (endCapVertexStart);
|
||
|
|
indices[endCapIndexStart + i * 3 + 1] = (UInt32) (endCapVertexStart + i + 1);
|
||
|
|
indices[endCapIndexStart + i * 3 + 2] = (UInt32) (endCapVertexStart + i + 2);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|