源码 / Ch05/Editor/Ch05Shots.cs
Ch05/Editor/Ch05Shots.cs
// 第 5 章配图：经典光照模型的参数扫描与对比 using Cookbook.Core; using UnityEngine; namespace Cookbook.Ch05 { static class Ch05Shots { static readonly Color Orange = new Color(0.85f, 0.5f, 0.25f); static readonly Color DarkBg = new Color(0.10f, 0.11f, 0.13f); // KeywordEnum：Unity 2022 新建材质时会按属性默认值自动打开一个关键字， // 所以切换时要同时设属性值、打开目标关键字、关掉同组其它关键字 static void SetKeywordEnum(Material m, string prop, string[] options, int index) { m.SetFloat(prop, index); for (int i = 0; i < options.Length; i++) { string kw = (prop + "_" + options[i]).ToUpperInvariant(); if (i == index) m.EnableKeyword(kw); else m.DisableKeyword(kw); } } // 低多边形 UV 球：用来放大逐顶点光照的问题 static Mesh UvSphere(int lon, int lat) { var verts = new System.Collections.Generic.List<Vector3>(); var tris = new System.Collections.Generic.List<int>(); for (int y = 0; y <= lat; y++) { float v = (float)y / lat * Mathf.PI; for (int x = 0; x <= lon; x++) { float u = (float)x / lon * Mathf.PI * 2f; verts.Add(new Vector3(Mathf.Sin(v) * Mathf.Cos(u), Mathf.Cos(v), Mathf.Sin(v) * Mathf.Sin(u)) * 0.5f); } } for (int y = 0; y < lat; y++) for (int x = 0; x < lon; x++) { int a = y * (lon + 1) + x, b = a + lon + 1; tris.Add(a); tris.Add(a + 1); tris.Add(b); tris.Add(b); tris.Add(a + 1); tris.Add(b + 1); } var m = new Mesh(); m.SetVertices(verts); m.SetTriangles(tris, 0); var n = new Vector3[verts.Count]; for (int i = 0; i < n.Length; i++) n[i] = verts[i].normalized; // 光滑法线 m.normals = n; m.RecalculateBounds(); return m; } // 一排球用正交相机拍：每个球的观察角度完全相同，对比才公平 static void RowCamera(Shot s, float y = 0.5f, float halfHeight = 0.97f) { s.Background(DarkBg); s.LookAt(new Vector3(0, y, -8f), new Vector3(0, y, 0)); s.Cam.orthographic = true; s.Cam.orthographicSize = halfHeight; } [BookShot("ch05-lambert", W = 640, H = 480, Panels = 3)] static void Lambert(Shot s) { s.Floor(); var m = s.Mat("Cookbook/Ch05/Lambert"); m.SetColor("_BaseColor", s.Panel == 0 ? Color.white * 0.8f : Orange); m.SetFloat("_AmbientStrength", s.Panel == 2 ? 1f : 0f); s.Sphere(m, new Vector3(0, 0.8f, 0), 1.5f); s.SunDir(30, -95); s.LookAt(new Vector3(0, 1.4f, -4.2f), new Vector3(0, 0.75f, 0), 32); } [BookShot("ch05-lightcolor", W = 640, H = 480, Panels = 3)] static void LightColor(Shot s) { s.Floor(); var m = s.Mat("Cookbook/Ch05/Lambert"); m.SetColor("_BaseColor", new Color(0.8f, 0.8f, 0.8f)); m.SetFloat("_AmbientStrength", 0.15f); s.Sphere(m, new Vector3(0, 0.8f, 0), 1.5f); s.SunDir(40, -60, 1f); if (s.Panel == 1) s.Sun.color = new Color(1f, 0.55f, 0.25f); if (s.Panel == 2) s.Sun.intensity = 3f; s.LookAt(new Vector3(0, 1.4f, -4.2f), new Vector3(0, 0.75f, 0), 32); } [BookShot("ch05-halflambert", W = 640, H = 480, Panels = 3)] static void HalfLambert(Shot s) { s.Floor(); Material m; if (s.Panel == 0) m = s.Mat("Cookbook/Ch05/Lambert"); else { m = s.Mat("Cookbook/Ch05/HalfLambert"); m.SetFloat("_Power", s.Panel == 1 ? 1f : 2f); } m.SetColor("_BaseColor", Orange); m.SetFloat("_AmbientStrength", 0f); s.Sphere(m, new Vector3(0, 0.8f, 0), 1.5f); s.SunDir(30, -95); s.LookAt(new Vector3(0, 1.4f, -4.2f), new Vector3(0, 0.75f, 0), 32); } [BookShot("ch05-wrap", W = 960, H = 420)] static void Wrap(Shot s) { RowCamera(s, 1.1f, 1.36f); float[] w = { 0f, 0.25f, 0.5f, 0.75f, 1f }; for (int row = 0; row < 2; row++) { int r = row; s.SphereRow(5, i => { var m = s.Mat("Cookbook/Ch05/WrapLighting"); m.SetColor("_BaseColor", Orange); m.SetFloat("_Wrap", w[i]); m.SetFloat("_AmbientStrength", 0.15f); if (r == 0) m.EnableKeyword("_WRAP_ENERGY_CONSERVING"); return m; }, y: row == 0 ? 0.5f : 1.7f, step: 1.15f); } s.SunDir(10, -90); } [BookShot("ch05-wrap-tint", W = 640, H = 480, Panels = 2)] static void WrapTint(Shot s) { s.Floor(); var m = s.Mat("Cookbook/Ch05/WrapLighting"); m.SetColor("_BaseColor", new Color(0.8f, 0.6f, 0.5f)); m.SetFloat("_Wrap", s.Panel == 0 ? 0f : 0.5f); m.EnableKeyword("_WRAP_ENERGY_CONSERVING"); m.SetColor("_TerminatorTint", s.Panel == 0 ? Color.black : new Color(0.7f, 0.12f, 0.05f)); m.SetFloat("_AmbientStrength", 0.3f); s.Sphere(m, new Vector3(0, 0.8f, 0), 1.5f); s.SunDir(25, -95); s.LookAt(new Vector3(0, 1.4f, -4.2f), new Vector3(0, 0.75f, 0), 32); } [BookShot("ch05-phong-shininess", W = 960, H = 300)] static void PhongShininess(Shot s) { RowCamera(s); float[] n = { 2f, 8f, 32f, 128f, 512f }; s.SphereRow(5, i => { var m = s.Mat("Cookbook/Ch05/Phong"); m.SetFloat("_Shininess", n[i]); m.SetFloat("_AmbientStrength", 0.4f); return m; }, step: 1.15f); s.SunDir(35, 25); } [BookShot("ch05-phong-vs-blinn", W = 640, H = 480, Panels = 3)] static void PhongVsBlinn(Shot s) { s.Background(DarkBg); Material m = s.Mat(s.Panel == 0 ? "Cookbook/Ch05/Phong" : "Cookbook/Ch05/BlinnPhong"); m.SetColor("_BaseColor", new Color(0.12f, 0.16f, 0.22f)); m.SetColor("_SpecColor", new Color(0.8f, 0.8f, 0.8f)); m.SetFloat("_Shininess", s.Panel == 2 ? 128f : 32f); m.SetFloat("_AmbientStrength", 0.3f); s.Grid(m, new Vector3(0, 0, 15f), 40f, 16); // 逆光、低角度：光从远处贴着平面照向相机，这是两种模型差异最大的情形 s.SunDir(12, 180, 1.2f); s.LookAt(new Vector3(0, 1.3f, -3f), new Vector3(0, 0f, 2.5f), 45); } [BookShot("ch05-normalized", W = 960, H = 420)] static void Normalized(Shot s) { RowCamera(s, 1.1f, 1.36f); float[] n = { 8f, 32f, 128f, 512f, 2048f }; for (int row = 0; row < 2; row++) { int r = row; s.SphereRow(5, i => { var m = s.Mat("Cookbook/Ch05/SpecularNormalized"); m.SetFloat("_Shininess", n[i]); SetKeywordEnum(m, "_Model", new[] { "BlinnPhong", "Phong" }, 0); if (r == 0) m.EnableKeyword("_NORMALIZE_SPECULAR"); else m.DisableKeyword("_NORMALIZE_SPECULAR"); m.SetFloat("_AmbientStrength", 0.5f); return m; }, y: row == 0 ? 0.5f : 1.7f, step: 1.15f); } s.SunDir(35, 25, 1.2f); } static void RoughRow(Shot s) { RowCamera(s); s.SphereRow(5, i => { var m = s.Mat("Cookbook/Ch05/RoughDiffuse"); SetKeywordEnum(m, "_Model", new[] { "Lambert", "OrenNayar", "Minnaert" }, i == 0 ? 0 : i == 4 ? 2 : 1); m.SetFloat("_Roughness", i == 1 ? 0.25f : i == 2 ? 0.5f : 1.0f); m.SetFloat("_MinnaertK", 0.7f); m.SetFloat("_AmbientStrength", 0.15f); return m; }, step: 1.15f); } [BookShot("ch05-roughdiffuse-front", W = 960, H = 300)] static void RoughFront(Shot s) { RoughRow(s); s.SunDir(8, 3, 1.3f); } // 光源几乎在相机身后 [BookShot("ch05-roughdiffuse-side", W = 960, H = 300)] static void RoughSide(Shot s) { RoughRow(s); s.SunDir(15, -80, 1.3f); } // 侧光 [BookShot("ch05-gouraud", W = 640, H = 480, Panels = 3)] static void Gouraud(Shot s) { s.Floor(); var m = s.Mat("Cookbook/Ch05/Gouraud"); if (s.Panel == 1) m.DisableKeyword("_PER_VERTEX"); else m.EnableKeyword("_PER_VERTEX"); var pos = new Vector3(0, 0.8f, 0); if (s.Panel == 2) s.Sphere(m, pos, 1.5f); else s.MeshObj(UvSphere(14, 9), m, pos, 1.5f, "LowPolySphere"); s.SunDir(40, 25); s.LookAt(new Vector3(0, 1.4f, -4.2f), new Vector3(0, 0.75f, 0), 32); } [BookShot("ch05-classiclab", W = 480, H = 420, Panels = 4)] static void ClassicLab(Shot s) { s.Floor(); var m = s.Mat("Cookbook/Ch05/ClassicLab"); int[] spec = { 1, 2, 2, 0 }; // Phong, BlinnPhong, BlinnPhong, None Color[] col = { new Color(0.2f, 0.35f, 0.65f), Orange, new Color(0.8f, 0.55f, 0.45f), new Color(0.7f, 0.68f, 0.62f) }; SetKeywordEnum(m, "_Diffuse", new[] { "Lambert", "HalfLambert", "Wrap", "OrenNayar" }, s.Panel); SetKeywordEnum(m, "_Specular", new[] { "None", "Phong", "BlinnPhong" }, spec[s.Panel]); m.SetColor("_BaseColor", col[s.Panel]); m.SetFloat("_Smoothness", s.Panel == 2 ? 0.45f : 0.6f); m.SetFloat("_Wrap", 0.5f); m.SetFloat("_Roughness", 0.8f); m.SetFloat("_AmbientStrength", 0.6f); s.Knot(m, new Vector3(0, 1.0f, 0), 1.1f); s.SunDir(35, -60); s.LookAt(new Vector3(0, 1.7f, -4.3f), new Vector3(0, 0.9f, 0), 34); } } }