280 lines
12 KiB
C#
280 lines
12 KiB
C#
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using System.Collections.Generic;
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namespace UnityEngine.Rendering.PostProcessing
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{
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//
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// Here's a quick look at the architecture of this framework and how it's integrated into Unity
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// (written between versions 5.6 and 2017.1):
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//
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// Users have to be able to plug in their own effects without having to modify the codebase and
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// these custom effects should work out-of-the-box with all the other features we provide
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// (volume blending etc). This relies on heavy use of polymorphism, but the only way to get
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// the serialization system to work well with polymorphism in Unity is to use ScriptableObjects.
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//
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// Users can push their custom effects at different (hardcoded) injection points.
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//
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// Each effect consists of at least two classes (+ shaders): a POD "Settings" class which only
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// stores parameters, and a "Renderer" class that holds the rendering logic. Settings are linked
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// to renderers using a PostProcessAttribute. These are automatically collected at init time
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// using reflection. Settings in this case are ScriptableObjects, we only need to serialize
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// these.
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//
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// We could store these settings object straight into each volume and call it a day, but
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// unfortunately there's one feature of Unity that doesn't work well with scene-stored assets:
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// prefabs. So we need to store all of these settings in a disk-asset and treat them as
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// sub-assets.
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//
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// Note: We have to use ScriptableObject for everything but these don't work with the Animator
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// tool. It's unfortunate but it's the only way to make it easily extensible. On the other
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// hand, users can animate post-processing effects using Volumes or straight up scripting.
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//
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// Volume blending leverages the physics system for distance checks to the nearest point on
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// volume colliders. Each volume can have several colliders or any type (cube, mesh...), making
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// it quite a powerful feature to use.
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//
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// Volumes & blending are handled by a singleton manager (see PostProcessManager).
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//
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// Rendering is handled by a PostProcessLayer component living on the camera, which mean you
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// can easily toggle post-processing on & off or change the anti-aliasing type per-camera,
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// which is very useful when doing multi-layered camera rendering or any other technique that
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// involves multiple-camera setups. This PostProcessLayer component can also filters volumes
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// by layers (as in Unity layers) so you can easily choose which volumes should affect the
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// camera.
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//
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// All post-processing shaders MUST use the custom Standard Shader Library bundled with the
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// framework. The reason for that is because the codebase is meant to work without any
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// modification on the Classic Render Pipelines (Forward, Deferred...) and the upcoming
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// Scriptable Render Pipelines (HDPipe, LDPipe...). But these don't have compatible shader
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// libraries so instead of writing two code paths we chose to provide a minimalist, generic
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// Standard Library geared toward post-processing use. An added bonus to that if users create
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// their own post-processing effects using this framework, then they'll work without any
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// modification on both Classic and Scriptable Render Pipelines.
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//
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/// <summary>
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/// A post-process volume component holding a post-process profile.
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/// </summary>
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/// <seealso cref="RuntimeUtilities.DestroyVolume"/>
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#if UNITY_2018_3_OR_NEWER
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[ExecuteAlways]
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#else
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[ExecuteInEditMode]
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#endif
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[AddComponentMenu("Rendering/Post-process Volume", 1001)]
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public sealed class PostProcessVolume : MonoBehaviour
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{
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/// <summary>
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/// The shared profile of this volume.
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/// Modifying <c>sharedProfile</c> will change all volumes using this profile, and change
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/// profile settings that are stored in the project too.
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/// </summary>
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/// <remarks>
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/// It is not recommended to modify profiles returned by <c>sharedProfile</c>. If you want
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/// to modify the profile of a volume use <see cref="profile"/> instead.
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/// </remarks>
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/// <seealso cref="profile"/>
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public PostProcessProfile sharedProfile;
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/// <summary>
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/// Should this volume be applied to the whole scene?
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/// </summary>
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[Tooltip("Check this box to mark this volume as global. This volume's Profile will be applied to the whole Scene.")]
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public bool isGlobal = false;
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/// <summary>
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/// The outer distance to start blending from. A value of 0 means no blending and the volume
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/// overrides will be applied immediatly upon entry.
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/// </summary>
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[Min(0f), Tooltip("The distance (from the attached Collider) to start blending from. A value of 0 means there will be no blending and the Volume overrides will be applied immediatly upon entry to the attached Collider.")]
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public float blendDistance = 0f;
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/// <summary>
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/// The total weight of this volume in the scene. 0 means it won't do anything, 1 means full
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/// effect.
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/// </summary>
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[Range(0f, 1f), Tooltip("The total weight of this Volume in the Scene. A value of 0 signifies that it will have no effect, 1 signifies full effect.")]
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public float weight = 1f;
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/// <summary>
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/// The volume priority in the stack. Higher number means higher priority. Negative values
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/// are supported.
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/// </summary>
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[Tooltip("The volume priority in the stack. A higher value means higher priority. Negative values are supported.")]
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public float priority = 0f;
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/// <summary>
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/// Returns the first instantiated <see cref="PostProcessProfile"/> assigned to the volume.
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/// Modifying <paramref name="profile"/> will change the profile for this volume only. If
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/// the profile is used by any other volume, this will clone the shared profile and start
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/// using it from now on.
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/// </summary>
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/// <remarks>
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/// This property automatically instantiates the profile and make it unique to this volume
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/// so you can safely edit it via scripting at runtime without changing the original asset
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/// in the project.
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/// Note that if you pass in your own profile, it is your responsibility to destroy it once
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/// it's not in use anymore.
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/// </remarks>
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/// <seealso cref="sharedProfile"/>
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/// <seealso cref="RuntimeUtilities.DestroyProfile"/>
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public PostProcessProfile profile
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{
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get
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{
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if (m_InternalProfile == null)
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{
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m_InternalProfile = ScriptableObject.CreateInstance<PostProcessProfile>();
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if (sharedProfile != null)
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{
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foreach (var item in sharedProfile.settings)
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{
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var itemCopy = Instantiate(item);
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m_InternalProfile.settings.Add(itemCopy);
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}
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}
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}
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return m_InternalProfile;
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}
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set
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{
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m_InternalProfile = value;
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}
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}
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internal PostProcessProfile profileRef
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{
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get
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{
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return m_InternalProfile == null
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? sharedProfile
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: m_InternalProfile;
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}
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}
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/// <summary>
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/// Checks if the volume has an intantiated profile or is using a shared profile.
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/// </summary>
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/// <returns><c>true</c> if the profile has been intantiated</returns>
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/// <seealso cref="profile"/>
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/// <seealso cref="sharedProfile"/>
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public bool HasInstantiatedProfile()
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{
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return m_InternalProfile != null;
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}
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internal int previousLayer => m_PreviousLayer;
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int m_PreviousLayer;
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float m_PreviousPriority;
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List<Collider> m_TempColliders;
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PostProcessProfile m_InternalProfile;
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void OnEnable()
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{
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PostProcessManager.instance.Register(this);
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m_PreviousLayer = gameObject.layer;
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m_TempColliders = new List<Collider>();
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}
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void OnDisable()
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{
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PostProcessManager.instance.Unregister(this);
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}
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void Update()
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{
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// Unfortunately we need to track the current layer to update the volume manager in
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// real-time as the user could change it at any time in the editor or at runtime.
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// Because no event is raised when the layer changes, we have to track it on every
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// frame :/
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int layer = gameObject.layer;
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if (layer != m_PreviousLayer)
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{
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PostProcessManager.instance.UpdateVolumeLayer(this, m_PreviousLayer, layer);
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m_PreviousLayer = layer;
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}
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// Same for `priority`. We could use a property instead, but it doesn't play nice with
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// the serialization system. Using a custom Attribute/PropertyDrawer for a property is
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// possible but it doesn't work with Undo/Redo in the editor, which makes it useless.
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if (priority != m_PreviousPriority)
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{
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PostProcessManager.instance.SetLayerDirty(layer);
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m_PreviousPriority = priority;
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}
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}
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// TODO: Look into a better volume previsualization system
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void OnDrawGizmos()
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{
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var colliders = m_TempColliders;
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GetComponents(colliders);
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if (isGlobal || colliders == null)
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return;
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#if UNITY_EDITOR
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// Can't access the UnityEditor.Rendering.PostProcessing namespace from here, so
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// we'll get the preferred color manually
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unchecked
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{
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int value = UnityEditor.EditorPrefs.GetInt("PostProcessing.Volume.GizmoColor", (int)0x8033cc1a);
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Gizmos.color = ColorUtilities.ToRGBA((uint)value);
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}
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#endif
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var scale = transform.lossyScale;
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var invScale = new Vector3(1f / scale.x, 1f / scale.y, 1f / scale.z);
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Gizmos.matrix = Matrix4x4.TRS(transform.position, transform.rotation, scale);
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// Draw a separate gizmo for each collider
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foreach (var collider in colliders)
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{
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if (!collider.enabled)
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continue;
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// We'll just use scaling as an approximation for volume skin. It's far from being
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// correct (and is completely wrong in some cases). Ultimately we'd use a distance
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// field or at least a tesselate + push modifier on the collider's mesh to get a
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// better approximation, but the current Gizmo system is a bit limited and because
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// everything is dynamic in Unity and can be changed at anytime, it's hard to keep
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// track of changes in an elegant way (which we'd need to implement a nice cache
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// system for generated volume meshes).
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var type = collider.GetType();
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if (type == typeof(BoxCollider))
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{
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var c = (BoxCollider)collider;
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Gizmos.DrawCube(c.center, c.size);
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Gizmos.DrawWireCube(c.center, c.size + invScale * blendDistance * 4f);
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}
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else if (type == typeof(SphereCollider))
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{
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var c = (SphereCollider)collider;
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Gizmos.DrawSphere(c.center, c.radius);
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Gizmos.DrawWireSphere(c.center, c.radius + invScale.x * blendDistance * 2f);
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}
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else if (type == typeof(MeshCollider))
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{
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var c = (MeshCollider)collider;
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// Only convex mesh colliders are allowed
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if (!c.convex)
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c.convex = true;
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// Mesh pivot should be centered or this won't work
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Gizmos.DrawMesh(c.sharedMesh);
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Gizmos.DrawWireMesh(c.sharedMesh, Vector3.zero, Quaternion.identity, Vector3.one + invScale * blendDistance * 4f);
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}
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// Nothing for capsule (DrawCapsule isn't exposed in Gizmo), terrain, wheel and
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// other colliders...
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}
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colliders.Clear();
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}
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}
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}
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