Get multi-projection to work

Source/ConformalDecals/IProjectionTarget.cs

@@ -0,0 +1,9 @@
+using UnityEngine;
+
+namespace ConformalDecals {
+    public interface IProjectionTarget {
+        void Project(Matrix4x4 orthoMatrix, Transform projector, Bounds projectionBounds);
+        void Render(Material decalMaterial, MaterialPropertyBlock partMPB, Camera camera);
+        ConfigNode Save();
+    }
+}

Source/ConformalDecals/ModuleConformalDecal.cs

@@ -99,7 +99,7 @@ namespace ConformalDecals {
         private const  int DecalQueueMax      = 2400;
         private static int _decalQueueCounter = -1;
 
-        private List<ProjectionTarget> _targets;
+        private Dictionary<Part, ProjectionPartTarget> _targets;
 
         private bool      _isAttached;
         private Matrix4x4 _orthoMatrix;
@@ -155,7 +155,7 @@ namespace ConformalDecals {
         /// <inheritdoc />
         public override void OnIconCreate() {
             UpdateTextures();
-            UpdateScale();
+            UpdateProjection();
         }
 
         /// <inheritdoc />
@@ -226,12 +226,12 @@ namespace ConformalDecals {
         protected void OnProjectionTweakEvent(BaseField field, object obj) {
             // scale or depth values have been changed, so update scale
             // and update projection matrices if attached
-            UpdateScale();
+            UpdateProjection();
             UpdateTargets();
 
             foreach (var counterpart in part.symmetryCounterparts) {
                 var decal = counterpart.GetComponent<ModuleConformalDecal>();
-                decal.UpdateScale();
+                decal.UpdateProjection();
                 decal.UpdateTargets();
             }
         }
@@ -256,38 +256,80 @@ namespace ConformalDecals {
 
         /// Called when a new variant is applied in the editor
         protected void OnVariantApplied(Part eventPart, PartVariant variant) {
-            if (_isAttached && eventPart != null) {
-                if (projectMultiple && eventPart != part.parent) return;
-                else if (!_targets.Select(o => o.targetPart).Contains(eventPart)) return;
-
+            if (_isAttached && eventPart != null && (!projectMultiple || eventPart == part.parent)) {
+                _targets.Remove(eventPart);
                 UpdateTargets();
             }
         }
 
         /// Called when an editor event occurs
         protected void OnEditorEvent(ConstructionEventType eventType, Part eventPart) {
-            if (this.part != eventPart && !part.symmetryCounterparts.Contains(eventPart)) return;
             switch (eventType) {
                 case ConstructionEventType.PartAttached:
-                    OnAttach();
+                    OnPartAttached(eventPart);
                     break;
                 case ConstructionEventType.PartDetached:
-                    OnDetach();
+                    OnPartDetached(eventPart);
                     break;
                 case ConstructionEventType.PartOffsetting:
                 case ConstructionEventType.PartRotating:
-                    UpdateScale();
-                    UpdateTargets();
+                    OnPartTransformed(eventPart);
                     break;
             }
         }
 
+        /// Called when a part is transformed in the editor
+        protected void OnPartTransformed(Part eventPart) {
+            if (this.part == eventPart) {
+                UpdateProjection();
+                UpdateTargets();
+            }
+            else {
+                UpdatePartTarget(eventPart, _boundsRenderer.bounds);
+                // recursively call for child parts
+                foreach (var child in eventPart.children) {
+                    OnPartTransformed(child);
+                }
+            }
+        }
+
+        /// Called when a part is attached in the editor
+        protected void OnPartAttached(Part eventPart) {
+            if (this.part == eventPart) {
+                OnAttach();
+            }
+            else {
+                UpdatePartTarget(eventPart, _boundsRenderer.bounds);
+                // recursively call for child parts
+                foreach (var child in eventPart.children) {
+                    OnPartAttached(child);
+                }
+            }
+        }
+
+        /// Called when a part is detached in the editor
+        protected void OnPartDetached(Part eventPart) {
+            if (this.part == eventPart) {
+                OnDetach();
+            }
+            else {
+                _targets.Remove(eventPart);
+                // recursively call for child parts
+                foreach (var child in eventPart.children) {
+                    OnPartDetached(child);
+                }
+            }
+        }
+
         /// Called when part `willDie` will be destroyed
         protected void OnPartWillDie(Part willDie) {
             if (willDie == part.parent) {
                 this.Log("Parent part about to be destroyed! Killing decal part.");
                 part.Die();
             }
+            else if (projectMultiple) {
+                _targets.Remove(willDie);
+            }
         }
 
         /// Called when decal is attached to a new part
@@ -310,7 +352,7 @@ namespace ConformalDecals {
             Camera.onPreCull += Render;
 
             UpdateMaterials();
-            UpdateScale();
+            UpdateProjection();
             UpdateTargets();
         }
 
@@ -328,11 +370,11 @@ namespace ConformalDecals {
             Camera.onPreCull -= Render;
 
             UpdateMaterials();
-            UpdateScale();
+            UpdateProjection();
         }
 
         // FUNCTIONS
-        
+
         /// Load any settings from the decal config
         protected virtual void LoadDecal(ConfigNode node) {
             // PARSE TRANSFORMS
@@ -498,10 +540,10 @@ namespace ConformalDecals {
         protected virtual void UpdateAll() {
             UpdateTextures();
             UpdateMaterials();
-            UpdateScale();
+            UpdateProjection();
             UpdateTargets();
         }
-        
+
         /// Update decal textures
         protected virtual void UpdateTextures() { }
 
@@ -521,7 +563,7 @@ namespace ConformalDecals {
         }
 
         /// Update decal scale and projection
-        protected void UpdateScale() {
+        protected void UpdateProjection() {
 
             // Update scale and depth
             scale = Mathf.Max(0.01f, scale);
@@ -559,7 +601,7 @@ namespace ConformalDecals {
             if (_isAttached) {
                 // Update projection targets
                 if (_targets == null) {
-                    _targets = new List<ProjectionTarget>();
+                    _targets = new Dictionary<Part, ProjectionPartTarget>();
                 }
                 else {
                     _targets.Clear();
@@ -587,6 +629,9 @@ namespace ConformalDecals {
         protected void UpdateTargets() {
             if (!_isAttached) return;
 
+            var projectionBounds = _boundsRenderer.bounds;
+
+            // collect list of potential targets
             IEnumerable<Part> targetParts;
             if (projectMultiple) {
                 targetParts = HighLogic.LoadedSceneIsFlight ? part.vessel.parts : EditorLogic.fetch.ship.parts;
@@ -596,25 +641,30 @@ namespace ConformalDecals {
             }
 
             foreach (var targetPart in targetParts) {
-                if (targetPart.GetComponent<ModuleConformalDecal>() != null) continue; // skip other decals
+                UpdatePartTarget(targetPart, projectionBounds);
+            }
+        }
 
-                foreach (var renderer in targetPart.FindModelComponents<MeshRenderer>()) {
-                    var target = renderer.transform;
-                    var filter = target.GetComponent<MeshFilter>();
+        protected void UpdatePartTarget(Part targetPart, Bounds projectionBounds) {
+            if (targetPart.GetComponent<ModuleConformalDecal>() != null) return; // skip other decals
 
-                    // check if the target has any missing data
-                    if (!ProjectionTarget.ValidateTarget(target, renderer, filter)) continue;
+            this.Log($"Updating projection onto part {targetPart.name}");
 
-                    // check bounds for intersection
-                    if (_boundsRenderer.bounds.Intersects(renderer.bounds)) {
-                        // create new ProjectionTarget to represent the renderer
-                        var projectionTarget = new ProjectionTarget(targetPart, target, renderer, filter, _orthoMatrix, decalProjectorTransform, useBaseNormal);
+            if (!_targets.TryGetValue(targetPart, out var target)) {
+                var rendererList = targetPart.FindModelComponents<MeshRenderer>();
 
-                        // add the target to the list
-                        _targets.Add(projectionTarget);
-                    }
+                if (rendererList.Any(o => projectionBounds.Intersects(o.bounds))) {
+                    target = new ProjectionPartTarget(targetPart, useBaseNormal);
+                    _targets.Add(targetPart, target);
+                }
+                else {
+                    return;
                 }
             }
+
+            this.Log($"valid target: {targetPart.name}");
+
+            target.Project(_orthoMatrix, decalProjectorTransform, projectionBounds);
         }
 
         /// Render the decal
@@ -622,7 +672,7 @@ namespace ConformalDecals {
             if (!_isAttached) return;
 
             // render on each target object
-            foreach (var target in _targets) {
+            foreach (var target in _targets.Values) {
                 target.Render(_decalMaterial, part.mpb, camera);
             }
         }

Source/ConformalDecals/ModuleConformalText.cs

@@ -264,7 +264,7 @@ namespace ConformalDecals {
 
                 UpdateTextures();
                 UpdateMaterials();
-                UpdateScale();
+                UpdateProjection();
 
                 // QUEUE PART FOR ICON FIXING IN VAB
                 DecalIconFixer.QueuePart(part.name);

Source/ConformalDecals/ProjectionMeshTarget.cs

@@ -6,69 +6,65 @@ using UnityEngine;
 using UnityEngine.Rendering;
 
 namespace ConformalDecals {
-    public class ProjectionTarget {
+    public class ProjectionMeshTarget : IProjectionTarget {
+        // enabled flag
+        public bool enabled = true;
+
         // Target object data
-        public readonly  Transform target;
-        public readonly  Part      targetPart;
-        private readonly Mesh      _targetMesh;
-        private readonly Matrix4x4 _decalMatrix;
-        private readonly Vector3   _decalNormal;
-        private readonly Vector3   _decalTangent;
-        private readonly bool      _useBaseNormal;
+        public readonly Transform    target;
+        public readonly Transform    root;
+        public readonly Mesh         mesh;
+        public readonly MeshRenderer renderer;
+
+        // Projection data
+        private Matrix4x4 _decalMatrix;
+        private Vector3   _decalNormal;
+        private Vector3   _decalTangent;
 
         // property block
         private readonly MaterialPropertyBlock _decalMPB;
 
-        public ProjectionTarget(Part targetPart, Transform target, MeshRenderer renderer, MeshFilter filter,
-            Matrix4x4 orthoMatrix, Transform projector, bool useBaseNormal) {
-
-            this.targetPart = targetPart;
+        public ProjectionMeshTarget(Transform target, Transform root, MeshRenderer renderer, Mesh mesh, bool useBaseNormal) {
+            this.root = root;
             this.target = target;
-            _targetMesh = filter.sharedMesh;
-            _useBaseNormal = useBaseNormal;
+            this.renderer = renderer;
+            this.mesh = mesh;
             _decalMPB = new MaterialPropertyBlock();
 
-            var projectorToTargetMatrix = target.worldToLocalMatrix * projector.localToWorldMatrix;
-
-            _decalMatrix = orthoMatrix * projectorToTargetMatrix.inverse;
-            _decalNormal = projectorToTargetMatrix.MultiplyVector(Vector3.back).normalized;
-            _decalTangent = projectorToTargetMatrix.MultiplyVector(Vector3.right).normalized;
-
-            SetupMPB(renderer.sharedMaterial);
+            SetNormalMap(renderer.sharedMaterial, useBaseNormal);
         }
 
-        public ProjectionTarget(ConfigNode node, Vessel vessel, bool useBaseNormal) {
-            var flightID = (uint) ParseUtil.ParseInt(node, "part");
+        public ProjectionMeshTarget(ConfigNode node, Transform root, bool useBaseNormal) {
+            if (node == null) throw new ArgumentNullException(nameof(node));
+            if (root == null) throw new ArgumentNullException(nameof(root));
+
             var targetPath = ParseUtil.ParseString(node, "targetPath");
             var targetName = ParseUtil.ParseString(node, "targetName");
 
             _decalMatrix = ParseUtil.ParseMatrix4x4(node, "decalMatrix");
             _decalNormal = ParseUtil.ParseVector3(node, "decalNormal");
             _decalTangent = ParseUtil.ParseVector3(node, "decalTangent");
-            _useBaseNormal = useBaseNormal;
             _decalMPB = new MaterialPropertyBlock();
 
-            targetPart = vessel[flightID];
-            if (targetPart == null) throw new IndexOutOfRangeException("Vessel returned null part");
-            target = LoadTransformPath(targetPath, targetPart.transform);
+            target = LoadTransformPath(targetPath, root);
             if (target.name != targetName) throw new FormatException("Target name does not match");
 
-            var renderer = target.GetComponent<MeshRenderer>();
+            renderer = target.GetComponent<MeshRenderer>();
             var filter = target.GetComponent<MeshFilter>();
 
             if (!ValidateTarget(target, renderer, filter)) throw new FormatException("Invalid target");
 
-            _targetMesh = filter.sharedMesh;
-
-            SetupMPB(renderer.sharedMaterial);
-        }
+            mesh = filter.sharedMesh;
 
-        private void SetupMPB(Material targetMaterial) {
+            SetNormalMap(renderer.sharedMaterial, useBaseNormal);
+            
             _decalMPB.SetMatrix(DecalPropertyIDs._ProjectionMatrix, _decalMatrix);
             _decalMPB.SetVector(DecalPropertyIDs._DecalNormal, _decalNormal);
-            _decalMPB.SetVector(DecalPropertyIDs._DecalTangent, _decalTangent);
+            _decalMPB.SetVector(DecalPropertyIDs._DecalTangent, _decalTangent); 
+        }
 
-            if (_useBaseNormal && targetMaterial.HasProperty(DecalPropertyIDs._BumpMap)) {
+        private void SetNormalMap(Material targetMaterial, bool useBaseNormal) {
+            if (useBaseNormal && targetMaterial.HasProperty(DecalPropertyIDs._BumpMap)) {
                 _decalMPB.SetTexture(DecalPropertyIDs._BumpMap, targetMaterial.GetTexture(DecalPropertyIDs._BumpMap));
 
                 var normalScale = targetMaterial.GetTextureScale(DecalPropertyIDs._BumpMap);
@@ -81,20 +77,40 @@ namespace ConformalDecals {
             }
         }
 
+        public void Project(Matrix4x4 orthoMatrix, Transform projector, Bounds projectionBounds) {
+            if (projectionBounds.Intersects(renderer.bounds)) {
+                enabled = true;
+                
+                var projectorToTargetMatrix = target.worldToLocalMatrix * projector.localToWorldMatrix;
+
+                _decalMatrix = orthoMatrix * projectorToTargetMatrix.inverse;
+                _decalNormal = projectorToTargetMatrix.MultiplyVector(Vector3.back).normalized;
+                _decalTangent = projectorToTargetMatrix.MultiplyVector(Vector3.right).normalized;
+
+                _decalMPB.SetMatrix(DecalPropertyIDs._ProjectionMatrix, _decalMatrix);
+                _decalMPB.SetVector(DecalPropertyIDs._DecalNormal, _decalNormal);
+                _decalMPB.SetVector(DecalPropertyIDs._DecalTangent, _decalTangent);
+            }
+            else {
+                enabled = false;
+            }
+        }
+
         public void Render(Material decalMaterial, MaterialPropertyBlock partMPB, Camera camera) {
+            if (!enabled) return;
+
             _decalMPB.SetFloat(PropertyIDs._RimFalloff, partMPB.GetFloat(PropertyIDs._RimFalloff));
             _decalMPB.SetColor(PropertyIDs._RimColor, partMPB.GetColor(PropertyIDs._RimColor));
 
-            Graphics.DrawMesh(_targetMesh, target.localToWorldMatrix, decalMaterial, 0, camera, 0, _decalMPB, ShadowCastingMode.Off, true);
+            Graphics.DrawMesh(mesh, target.localToWorldMatrix, decalMaterial, 0, camera, 0, _decalMPB, ShadowCastingMode.Off, true);
         }
 
         public ConfigNode Save() {
-            var node = new ConfigNode("TARGET");
-            node.AddValue("part", targetPart.flightID);
+            var node = new ConfigNode("MESH_TARGET");
             node.AddValue("decalMatrix", _decalMatrix);
             node.AddValue("decalNormal", _decalNormal);
             node.AddValue("decalTangent", _decalTangent);
-            node.AddValue("targetPath", SaveTransformPath(target, targetPart.transform)); // used to find the target transform
+            node.AddValue("targetPath", SaveTransformPath(target, root)); // used to find the target transform
             node.AddValue("targetName", target.name); // used to validate the mesh has not changed since last load
 
             return node;
@@ -116,7 +132,7 @@ namespace ConformalDecals {
         }
 
         private static string SaveTransformPath(Transform leaf, Transform root) {
-            var builder = new StringBuilder(leaf.name);
+            var builder = new StringBuilder($"{leaf.GetSiblingIndex()}");
             var current = leaf.parent;
 
             while (current != root) {

Source/ConformalDecals/ProjectionPartTarget.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace ConformalDecals {
+    public class ProjectionPartTarget : IProjectionTarget {
+        public readonly Part                       part;
+        public readonly List<ProjectionMeshTarget> meshTargets;
+
+        public ProjectionPartTarget(Part part, bool useBaseNormal) {
+            this.part = part;
+            meshTargets = new List<ProjectionMeshTarget>();
+
+            foreach (var renderer in part.FindModelComponents<MeshRenderer>()) {
+                var target = renderer.transform;
+                var filter = target.GetComponent<MeshFilter>();
+
+                // check if the target has any missing data
+                if (!ProjectionMeshTarget.ValidateTarget(target, renderer, filter)) continue;
+
+                // create new ProjectionTarget to represent the renderer
+                var projectionTarget = new ProjectionMeshTarget(target, part.transform, renderer, filter.sharedMesh, useBaseNormal);
+
+                // add the target to the list
+                meshTargets.Add(projectionTarget);
+            }
+        }
+
+        public void Project(Matrix4x4 orthoMatrix, Transform projector, Bounds projectionBounds) {
+            foreach (var meshTarget in meshTargets) {
+                meshTarget.Project(orthoMatrix, projector, projectionBounds);
+            }
+        }
+
+        public void Render(Material decalMaterial, MaterialPropertyBlock partMPB, Camera camera) {
+            foreach (var target in meshTargets) {
+                target.Render(decalMaterial, partMPB, camera);
+            }
+        }
+
+        public ConfigNode Save() {
+            var node = new ConfigNode("PART_TARGET");
+            node.AddValue("part", part.flightID);
+            foreach (var meshTarget in meshTargets) {
+                node.AddNode(meshTarget.Save());
+            }
+
+            return node;
+        }
+    }
+}