creae collision Geometry from mesh

libraries/entities-renderer/CMakeLists.txt

@@ -1,7 +1,7 @@
 set(TARGET_NAME entities-renderer)
 AUTOSCRIBE_SHADER_LIB(gpu model procedural render render-utils)
 setup_hifi_library(Widgets Network Script)
-link_hifi_libraries(shared gpu procedural model model-networking script-engine render render-utils)
+link_hifi_libraries(shared gpu procedural model model-networking script-engine render render-utils physics)
 
 target_bullet()
 

libraries/entities-renderer/src/RenderableModelEntityItem.cpp

@@ -17,6 +17,7 @@
 #include <glm/gtx/transform.hpp>
 
 #include <AbstractViewStateInterface.h>
+#include <CollisionRenderMeshCache.h>
 #include <Model.h>
 #include <PerfStat.h>
 #include <render/Scene.h>
@@ -917,8 +918,22 @@ void RenderableModelEntityItem::computeShapeInfo(ShapeInfo& info) {
     }
 }
 
+static CollisionRenderMeshCache collisionMeshCache;
+
 void RenderableModelEntityItem::setCollisionShape(const btCollisionShape* shape) {
-    // TODO: generate collision mesh and update _model
+    const void* key = static_cast<const void*>(shape);
+    if (_collisionMeshKey != key) {
+        if (_collisionMeshKey) {
+            // releasing the shape is not strictly necessary, but
+            // we do it as hint to the cache's garbage collection system
+            collisionMeshCache.releaseMesh(_collisionMeshKey);
+        }
+        _collisionMeshKey = key;
+        model::MeshPointer mesh = collisionMeshCache.getMesh(_collisionMeshKey);
+        if (_model) {
+            _model->setCollisionMesh(mesh);
+        }
+    }
 }
 
 bool RenderableModelEntityItem::contains(const glm::vec3& point) const {

libraries/entities-renderer/src/RenderableModelEntityItem.h

@@ -119,6 +119,7 @@ private:
     bool getAnimationFrame();
 
     bool _needsJointSimulation { false };
+    const void* _collisionMeshKey { nullptr };
 };
 
 #endif // hifi_RenderableModelEntityItem_h

libraries/model-networking/src/model-networking/ModelCache.h

@@ -111,13 +111,12 @@ public:
 
     QUrl getURL() const { return (bool)_resource ? _resource->getURL() : QUrl(); }
 
-signals:
-    void finished(bool success);
-
-private:
     void startWatching();
     void stopWatching();
 
+signals:
+    void finished(bool success);
+
 private slots:
     void resourceFinished(bool success);
     void resourceRefreshed();

libraries/physics/src/CollisionRenderMeshCache.cpp

@@ -67,12 +67,16 @@ void copyShapeToMesh(const btTransform& transform, const btConvexShape* shape, m
     }
 }
 
-model::MeshPointer createMeshFromShape(const btCollisionShape* shape) {
+model::MeshPointer createMeshFromShape(const void* pointer) {
     model::MeshPointer mesh;
-    if (!shape) {
+    if (!pointer) {
         return mesh;
     }
 
+    // pointer must actually be a const btCollisionShape*, but it only
+    // needs to be valid here when its render mesh is created.
+    const btCollisionShape* shape = static_cast<const btCollisionShape*>(pointer);
+
     int32_t shapeType = shape->getShapeType();
     if (shapeType == (int32_t)COMPOUND_SHAPE_PROXYTYPE || shape->isConvex()) {
         // create the mesh and allocate buffers for it
@@ -84,7 +88,7 @@ model::MeshPointer createMeshFromShape(const btCollisionShape* shape) {
         if (shapeType == (int32_t)COMPOUND_SHAPE_PROXYTYPE) {
             const btCompoundShape* compoundShape = static_cast<const btCompoundShape*>(shape);
             int32_t numSubShapes = compoundShape->getNumChildShapes();
-            for (int i = 0; i < numSubShapes; ++i) {
+            for (int32_t i = 0; i < numSubShapes; ++i) {
                 const btCollisionShape* childShape = compoundShape->getChildShape(i);
                 if (childShape->isConvex()) {
                     const btConvexShape* convexShape = static_cast<const btConvexShape*>(childShape);
@@ -122,6 +126,10 @@ model::MeshPointer CollisionRenderMeshCache::getMesh(CollisionRenderMeshCache::K
             mesh = itr->second;
         }
     }
+    const uint32_t MAX_NUM_PENDING_GARBAGE = 20;
+    if (_pendingGarbage.size() > MAX_NUM_PENDING_GARBAGE) {
+        collectGarbage();
+    }
     return mesh;
 }
 
@@ -131,19 +139,19 @@ bool CollisionRenderMeshCache::releaseMesh(CollisionRenderMeshCache::Key key) {
     }
     CollisionMeshMap::const_iterator itr = _meshMap.find(key);
     if (itr != _meshMap.end()) {
+        // we hold at least one reference, and the outer scope also holds at least one
+        // so we assert that the reference count is not 1
         assert((*itr).second.use_count() != 1);
+
         _pendingGarbage.push_back(key);
-        if ((*itr).second.use_count() == 1) {
-            // we hold all of the references inside the cache so we'll try to delete later
-        }
         return true;
     }
     return false;
 }
 
 void CollisionRenderMeshCache::collectGarbage() {
-    int numShapes = _pendingGarbage.size();
-    for (int i = 0; i < numShapes; ++i) {
+    uint32_t numShapes = _pendingGarbage.size();
+    for (int32_t i = 0; i < numShapes; ++i) {
         CollisionRenderMeshCache::Key key = _pendingGarbage[i];
         CollisionMeshMap::const_iterator itr = _meshMap.find(key);
         if (itr != _meshMap.end()) {

libraries/physics/src/CollisionRenderMeshCache.h

@@ -18,6 +18,7 @@
 
 #include <model/Geometry.h>
 
+/*
 class btCollisionShape;
 
 namespace std {
@@ -28,10 +29,11 @@ namespace std {
         }
     };
 }
+*/
 
 class CollisionRenderMeshCache {
 public:
-	using Key = const btCollisionShape*;
+	using Key = const void*; // must actually be a const btCollisionShape*
 
     CollisionRenderMeshCache();
     ~CollisionRenderMeshCache();

libraries/render-utils/src/Model.cpp

@@ -1336,6 +1336,28 @@ bool Model::initWhenReady(render::ScenePointer scene) {
     return false;
 }
 
+class CollisionRenderGeometry : public Geometry {
+public:
+    CollisionRenderGeometry(model::MeshPointer mesh) {
+        _fbxGeometry = std::make_shared<FBXGeometry>();
+        std::shared_ptr<GeometryMeshes> meshes = std::make_shared<GeometryMeshes>();
+        meshes->push_back(mesh);
+        _meshes = meshes;
+        _meshParts = std::shared_ptr<const GeometryMeshParts>();
+    }
+};
+
+void Model::setCollisionMesh(model::MeshPointer mesh) {
+    _collisionWatcher.stopWatching();
+    _collisionGeometry = std::make_shared<CollisionRenderGeometry>(mesh);
+
+    if (_showCollisionHull) {
+        // TODO: need to trigger:
+        // (a) reconstruction of RenderItems
+        // (b) and reinsertion into scene if we are showing collision geometry
+    }
+}
+
 ModelBlender::ModelBlender() :
     _pendingBlenders(0) {
 }

libraries/render-utils/src/Model.h

@@ -249,6 +249,7 @@ public slots:
 signals:
     void setURLFinished(bool success);
     void setCollisionModelURLFinished(bool success);
+    void setCollisionMesh(model::MeshPointer mesh);
 
 protected:
 
@@ -282,7 +283,7 @@ protected:
     bool getJointPosition(int jointIndex, glm::vec3& position) const;
 
     Geometry::Pointer _renderGeometry; // only ever set by its watcher
-    Geometry::Pointer _collisionGeometry; // only ever set by its watcher
+    Geometry::Pointer _collisionGeometry;
 
     GeometryResourceWatcher _renderWatcher;
     GeometryResourceWatcher _collisionWatcher;