75 lines
2.5 KiB
C#
75 lines
2.5 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Numerics;
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namespace Csharp_3d_viewer
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{
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public class CylinderRenderer : TriangleRenderer
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{
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private const float baseRadius = 1.0f;
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private const float height = 1.0f;
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private const float baseScale = 0.01f;
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private const int MinSectorCount = 3;
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public CylinderRenderer(int sectorCount = 36)
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{
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sectorCount = Math.Max(sectorCount, MinSectorCount);
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BuildVertices(sectorCount, out var vertices, out var indices);
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UpdateTriangles(vertices, indices);
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}
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public void Render(Vector3 start, Vector3 end, Vector4 color)
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{
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var centralAxis = start - end;
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var length = centralAxis.Length();
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var centerPosition = (start + end) / 2;
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var model = Matrix4x4.CreateScale(baseScale, baseScale, length) * Matrix4x4.CreateWorld(centerPosition, -centralAxis, Vector3.UnitZ);
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Render(model, color);
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}
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private void BuildVertices(int sectorCount, out Vertex[] vertices, out int[] indices)
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{
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var radiusInv = 1.0f / baseRadius;
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var sectorStep = (float)(2 * Math.PI / sectorCount);
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var verticesList = new List<Vertex>();
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for (int circleIndex = 0; circleIndex < 2; ++circleIndex)
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{
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Vector3 position = new Vector3();
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position.Z = height / 2 * (1 - 2 * circleIndex);
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for (int j = 0; j <= sectorCount; ++j)
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{
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var sectorAngle = j * sectorStep;
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position.X = (float)(baseRadius * Math.Cos(sectorAngle));
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position.Y = (float)(baseRadius * Math.Sin(sectorAngle));
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Vector3 normal = new Vector3(position.X, position.Y, 0.0f) * radiusInv;
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verticesList.Add(new Vertex { Position = position, Normal = normal });
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}
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}
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vertices = verticesList.ToArray();
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var indicesList = new List<int>();
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var k1 = 0;
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var k2 = k1 + sectorCount + 1;
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for (int j = 0; j < sectorCount; ++j, ++k1, ++k2)
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{
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indicesList.Add(k1);
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indicesList.Add(k2);
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indicesList.Add(k1 + 1);
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indicesList.Add(k1 + 1);
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indicesList.Add(k2);
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indicesList.Add(k2 + 1);
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}
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indices = indicesList.ToArray();
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}
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}
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}
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