Use bounds to choose projection targets

Distribution/GameData/ConformalDecals/Plugins/ConformalDecals.dll

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:f7fcc42c1ba59a7694df18c60f827f5fd98113ce3471dc01dab37bb67b2d63e5
+oid sha256:81553ade6fce5028845f7a6753471e5106dc4768f79a2d482fa03dd0cc8f5d42
 size 38400

Source/ConformalDecals/ModuleConformalDecal.cs

@@ -142,6 +142,7 @@ namespace ConformalDecals {
 
         private Material _decalMaterial;
         private Material _previewMaterial;
+        private BoxCollider _boundsCollider;
         
         internal bool _shouldRender;
 
@@ -320,6 +321,8 @@ namespace ConformalDecals {
             var boundsBehaviour = decalBoundsTransform.gameObject.AddComponent<DecalBoundsBehaviour>();
             boundsBehaviour.decalRenderer = this;
 
+            _boundsCollider = decalBoundsTransform.GetComponent<BoxCollider>();
+
             UpdateMaterials();
 
             if (HighLogic.LoadedSceneIsGame) {
@@ -481,7 +484,7 @@ namespace ConformalDecals {
 
                 // update projection
                 foreach (var target in _targets) {
-                    target.Project(_orthoMatrix, decalProjectorTransform, useBaseNormal);
+                    target.Project(_orthoMatrix, decalProjectorTransform, _boundsCollider.bounds, useBaseNormal);
                 }
             }
             else {

Source/ConformalDecals/ProjectionTarget.cs

@@ -20,30 +20,35 @@ namespace ConformalDecals {
             _decalMPB = new MaterialPropertyBlock();
         }
 
-        public void Project(Matrix4x4 orthoMatrix, Transform projector, bool useBaseNormal) {
-            _projectionEnabled = true;
+        public void Project(Matrix4x4 orthoMatrix, Transform projector, Bounds projectorBounds, bool useBaseNormal) {
 
-            var targetMaterial = _targetRenderer.sharedMaterial;
-            var projectorToTargetMatrix = target.worldToLocalMatrix * projector.localToWorldMatrix;
+            if (projectorBounds.Intersects(_targetRenderer.bounds)) {
+                _projectionEnabled = true;
+                var targetMaterial = _targetRenderer.sharedMaterial;
+                var projectorToTargetMatrix = target.worldToLocalMatrix * projector.localToWorldMatrix;
 
-            var projectionMatrix = orthoMatrix * projectorToTargetMatrix.inverse;
-            var decalNormal = projectorToTargetMatrix.MultiplyVector(Vector3.back).normalized;
-            var decalTangent = projectorToTargetMatrix.MultiplyVector(Vector3.right).normalized;
+                var projectionMatrix = orthoMatrix * projectorToTargetMatrix.inverse;
+                var decalNormal = projectorToTargetMatrix.MultiplyVector(Vector3.back).normalized;
+                var decalTangent = projectorToTargetMatrix.MultiplyVector(Vector3.right).normalized;
 
-            _decalMPB.SetMatrix(DecalPropertyIDs._ProjectionMatrix, projectionMatrix);
-            _decalMPB.SetVector(DecalPropertyIDs._DecalNormal, decalNormal);
-            _decalMPB.SetVector(DecalPropertyIDs._DecalTangent, decalTangent);
+                _decalMPB.SetMatrix(DecalPropertyIDs._ProjectionMatrix, projectionMatrix);
+                _decalMPB.SetVector(DecalPropertyIDs._DecalNormal, decalNormal);
+                _decalMPB.SetVector(DecalPropertyIDs._DecalTangent, decalTangent);
 
-            if (useBaseNormal && targetMaterial.HasProperty(DecalPropertyIDs._BumpMap)) {
-                _decalMPB.SetTexture(DecalPropertyIDs._BumpMap, targetMaterial.GetTexture(DecalPropertyIDs._BumpMap));
+                if (useBaseNormal && targetMaterial.HasProperty(DecalPropertyIDs._BumpMap)) {
+                    _decalMPB.SetTexture(DecalPropertyIDs._BumpMap, targetMaterial.GetTexture(DecalPropertyIDs._BumpMap));
 
-                var normalScale = targetMaterial.GetTextureScale(DecalPropertyIDs._BumpMap);
-                var normalOffset = targetMaterial.GetTextureOffset(DecalPropertyIDs._BumpMap);
+                    var normalScale = targetMaterial.GetTextureScale(DecalPropertyIDs._BumpMap);
+                    var normalOffset = targetMaterial.GetTextureOffset(DecalPropertyIDs._BumpMap);
 
-                _decalMPB.SetVector(DecalPropertyIDs._BumpMap_ST, new Vector4(normalScale.x, normalScale.y, normalOffset.x, normalOffset.y));
+                    _decalMPB.SetVector(DecalPropertyIDs._BumpMap_ST, new Vector4(normalScale.x, normalScale.y, normalOffset.x, normalOffset.y));
+                }
+                else {
+                    _decalMPB.SetTexture(DecalPropertyIDs._BumpMap, DecalConfig.BlankNormal);
+                }
             }
             else {
-                _decalMPB.SetTexture(DecalPropertyIDs._BumpMap, DecalConfig.BlankNormal);
+                _projectionEnabled = false;
             }
         }