Add projection and loading functionality

ModuleConformalDecal is now, theoretically, sorta working

Source/ConformalDecals/ConformalDecals.csproj

@@ -38,7 +38,6 @@
             <HintPath>dlls/Shabby.dll</HintPath>
         </Reference>
         <Reference Include="System" />
-        <Reference Include="System.Core" />
         <Reference Include="UnityEngine.CoreModule, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null">
           <HintPath>dlls\UnityEngine.CoreModule.dll</HintPath>
         </Reference>

Source/ConformalDecals/ModuleConformalDecal.cs

@@ -1,19 +1,89 @@
 using System;
+using System.Collections.Generic;
+using ConformalDecals.MaterialModifiers;
+using UniLinq;
 using UnityEngine;
 
 namespace ConformalDecals {
     public class ModuleConformalDecal : PartModule {
         [KSPField] public string decalPreviewTransform = "";
+        [KSPField] public string decalModelTransform   = "";
+
+        [KSPField(guiName = "Scale", guiActive = false, guiActiveEditor = true, isPersistant = true, guiFormat = "F2", guiUnits = "m"),
+         UI_FloatRange(minValue = 0.05f, maxValue = 4f, stepIncrement = 0.05f)]
+        public float scale = 1.0f;
+
+        [KSPField(guiName = "Depth", guiActive = false, guiActiveEditor = true, isPersistant = true, guiFormat = "F2", guiUnits = "m"),
+         UI_FloatRange(minValue = 0.05f, maxValue = 4f, stepIncrement = 0.05f)]
+        public float depth = 1.0f;
+
+        [KSPField(guiActive = true, guiFormat = "F2", guiName = "Aspect Ratio")]
+        public float aspectRatio = 1.0f;
+
+        private List<ProjectionTarget>     _targets;
+        private MaterialPropertyCollection _materialProperties;
+        private Material                   _material;
+
+        private Matrix4x4 _orthoMatrix;
+        private Bounds    _decalBounds;
+
+        private Transform _decalPreviewTransform;
+        private Transform _decalModelTransform;
+
+        private bool IsAttached => part.parent != null;
+
+        public override void OnLoad(ConfigNode node) {
+            if (HighLogic.LoadedSceneIsGame) {
+                try {
+                    var materialNode = node.GetNode("MATERIAL") ?? throw new FormatException("Missing MATERIAL node in module");
+                    _materialProperties = new MaterialPropertyCollection(materialNode, this);
+                    _material = _materialProperties.ParsedMaterial;
+
+                    var mainTexture = _materialProperties.MainTextureProperty;
+                    if (mainTexture != null) {
+                        aspectRatio = mainTexture.AspectRatio;
+                    }
+                    else {
+                        aspectRatio = 1;
+                    }
+
+                    _decalPreviewTransform = part.FindModelTransform(decalPreviewTransform);
+                    if (_decalPreviewTransform == null) throw new FormatException("Missing decal preview reference");
+
+                    _decalModelTransform = part.FindModelTransform(decalModelTransform);
+                    if (_decalModelTransform == null) throw new FormatException("Missing decal mesh reference");
+                }
+                catch (Exception e) {
+                    this.LogException("Exception parsing partmodule", e);
+                }
+            }
+        }
+
+        public override void OnStart(StartState state) {
+            _orthoMatrix = Matrix4x4.identity;
+            _orthoMatrix[0, 3] = 0.5f;
+            _orthoMatrix[1, 3] = 0.5f;
 
-        public void OnStart(StartState state) {
             if ((state & StartState.Editor) != 0) {
                 GameEvents.onEditorPartEvent.Add(OnEditorEvent);
+                Fields[nameof(scale)].uiControlEditor.onFieldChanged = OnTweakEvent;
+                Fields[nameof(depth)].uiControlEditor.onFieldChanged = OnTweakEvent;
             }
             else {
-                Attach();
+                if (IsAttached) Attach();
             }
         }
 
+        public void OnDisable() {
+            // remove from preCull delegate
+            Camera.onPreCull -= Render;
+        }
+
+        public void OnTweakEvent(BaseField field, object obj) {
+            // scale or depth values have been changed, so update the projection matrix for each target
+            Project();
+        }
+
         public void OnEditorEvent(ConstructionEventType eventType, Part eventPart) {
             if (eventPart != this.part) return;
             switch (eventType) {
@@ -29,33 +99,65 @@ namespace ConformalDecals {
                     Project();
                     break;
             }
-
         }
 
         public void Attach() {
-            if (part.parent == null) {
+            if (!IsAttached) {
                 this.LogError("Attach function called but part has no parent!");
                 return;
             }
 
+            // find all valid renderers
+            var renderers = part.parent.transform.GetComponentsInChildren<MeshRenderer>(false).Where(o => o.GetComponent<MeshFilter>() != null);
+            // generate ProjectionTarget objects for each valid meshrenderer
+            _targets = renderers.Select(o => new ProjectionTarget(o, o.GetComponent<MeshFilter>().mesh, _materialProperties)).ToList();
+
+            // hide preview model
+            _decalModelTransform.gameObject.SetActive(false);
+
+            // add to preCull delegate
             Camera.onPreCull += Render;
         }
 
         public void Detach() {
-            if (part.parent != null) {
+            if (IsAttached) {
                 this.LogError("Detach function called but part still has parent!");
                 return;
             }
 
+            // unhide preview model
+            _decalModelTransform.gameObject.SetActive(true);
+
+            // remove from preCull delegate
             Camera.onPreCull -= Render;
         }
 
-        public void OnDisable() {
+        [KSPEvent(guiActive = false, guiName = "Project", guiActiveEditor =true, active = true)]
-            Camera.onPreCull -= Render;
+        public void Project() {
+            if (!IsAttached) return;
+
+            // generate orthogonal matrix scale values
+            _orthoMatrix[0, 0] = 1 / scale;
+            _orthoMatrix[1, 1] = 1 / (aspectRatio * scale);
+            _orthoMatrix[2, 2] = 1 / depth;
+
+            // generate bounding box for decal for culling purposes
+            _decalBounds.center = Vector3.forward * (depth / 2);
+            _decalBounds.extents = new Vector3(scale / 2, aspectRatio * scale / 2, depth / 2);
+
+            // project to each target object
+            foreach (var target in _targets) {
+                target.Project(_orthoMatrix, _decalBounds);
+            }
         }
 
-        public void Project() { }
+        public void Render(Camera camera) {
+            if (!IsAttached) return;
 
-        public void Render(Camera camera) { }
+            // render on each target object
+            foreach (var target in _targets) {
+                target.Render(_material, part.mpb, camera);
+            }
+        }
     }
 }

Source/ConformalDecals/ProjectionTarget.cs

@@ -48,7 +48,7 @@ namespace ConformalDecals {
             }
         }
 
-        public void Project(Matrix4x4 orthoMatrix, OrientedBounds projectorBounds) {
+        public void Project(Matrix4x4 orthoMatrix, Bounds projectorBounds) {
             var projectorToTargetMatrix = Target.worldToLocalMatrix * Projector.localToWorldMatrix;
 
             var projectionMatrix = orthoMatrix * projectorToTargetMatrix.inverse;
@@ -60,7 +60,7 @@ namespace ConformalDecals {
             DecalMPB.SetVector(_decalTangentID, decalTangent);
 
             var targetBounds = new OrientedBounds(Target.localToWorldMatrix, _targetRenderer.bounds);
-            _projectionEnabled = projectorBounds.Intersects(targetBounds);
+            _projectionEnabled = targetBounds.Intersects(projectorBounds);
         }
 
         public bool Render(Material decalMaterial, MaterialPropertyBlock partMPB, Camera camera) {