void vHavokStaticMesh::Init(VisStaticMeshInstCollection &meshInstances)
{
// Init may only be called once
VVERIFY_OR_RET(m_bInitialized == false);
// Add the static mesh instances
int iCount = meshInstances.GetLength();
for (int i = 0; i < iCount; i++)
{
m_staticMeshes.Append(meshInstances[i]);
meshInstances[i]->SetPhysicsObject(this);
m_iNumValidStaticMeshes++;
}
m_bInitialized = true;
CreateHkRigidBody();
}
hkRefNew<hkpShape> vHavokShapeFactory::CreateShapeFromStaticMeshInstances(const VisStaticMeshInstCollection &meshInstances, int iCreationFlags, const char **szShapeCacheId)
{
int iCount = meshInstances.GetLength();
VVERIFY_OR_RET_VAL(iCount>0 && szShapeCacheId!=NULL, NULL);
// Actual mesh scale, which is only used for caching.
hkvVec3 vScale(hkvNoInitialization);
ExtractScaling(meshInstances[0]->GetTransform(), vScale);
char szShapeId[512];
const bool bAllowStaticMeshCaching = vHavokPhysicsModule_GetDefaultWorldRuntimeSettings().m_bEnableShapeCaching==TRUE;
const vHavokPhysicsModule *pModule = vHavokPhysicsModule::GetInstance();
VASSERT(pModule != NULL);
const bool bForceHktShapeCaching = pModule->IsHktShapeCachingEnforced();
// For single mesh instances the per instance welding type is used. For merged mesh instances the global merged welding type is used.
VisWeldingType_e eWeldingType = (iCount==1) ? meshInstances[0]->GetWeldingType() : (VisWeldingType_e)vHavokPhysicsModule_GetWorldSetupSettings().m_iMergedStaticWeldingType;
const bool bAllowPerTriCollisionInfo = iCreationFlags & VShapeCreationFlags_ALLOW_PERTRICOLINFO;
const bool bShrinkByCvxRadius = iCreationFlags & VShapeCreationFlags_SHRINK;
// Check whether shape has been already cached for this mesh with the respective scaling.
// We are just caching single static mesh instances and no static mesh collections.
hkpShape *pCachedShape = HK_NULL;
if (iCount == 1)
{
// first, find the convex version
GetIDStringForConvexShape(szShapeId, meshInstances[0]->GetMesh()->GetFilename(), vScale, bShrinkByCvxRadius);
pCachedShape = FindShape(szShapeId, szShapeCacheId);
if (!pCachedShape)
{
// then find the mesh version
GetIDStringForMeshShape(szShapeId, meshInstances[0]->GetMesh()->GetFilename(), vScale, meshInstances[0]->GetCollisionBehavior(), eWeldingType);
pCachedShape = FindShape(szShapeId, szShapeCacheId);
}
if (pCachedShape)
{
pCachedShape->addReference();
return pCachedShape;
}
if (bAllowStaticMeshCaching)
{
// first, find the convex version
pCachedShape = vHavokCachedShape::LoadConvexShape(meshInstances[0]->GetMesh(), vScale, bShrinkByCvxRadius);
if (pCachedShape)
{
*szShapeCacheId = AddShape(szShapeId, pCachedShape);
#ifdef HK_DEBUG_SLOW
const hkClass* loadedClassType = hkVtableClassRegistry::getInstance().getClassFromVirtualInstance(pCachedShape);
HK_ASSERT2(0x5432c902, loadedClassType && (hkString::strCmp( loadedClassType->getName(), "hkvConvexVerticesShape" ) == 0), "Serialized in a unexpected cached Havok shape type!");
#endif
return pCachedShape;
}
else
{
// then find the mesh version
pCachedShape = vHavokCachedShape::LoadMeshShape(meshInstances[0]->GetMesh(), vScale, meshInstances[0]->GetCollisionBehavior(), eWeldingType);
}
if (pCachedShape )
{
*szShapeCacheId = AddShape(szShapeId, pCachedShape);
#ifdef HK_DEBUG_SLOW
const hkClass* loadedClassType = hkVtableClassRegistry::getInstance().getClassFromVirtualInstance(pCachedShape);
HK_ASSERT2(0x5432c902, loadedClassType && (hkString::strCmp( loadedClassType->getName(), "hkvBvCompressedMeshShape" ) == 0), "Serialized in a unexpected cached Havok shape type!");
#endif
hkvBvCompressedMeshShape *pCompressedMeshShape = reinterpret_cast<hkvBvCompressedMeshShape*>(pCachedShape);
pCompressedMeshShape->SetupMaterials();
return pCachedShape;
}
else if(!Vision::Editor.IsInEditor() && !bForceHktShapeCaching)
{
Vision::Error.Warning("Cached HKT file for %s is missing. Please generate HKT file (see documentation for details).", meshInstances[0]->GetMesh()->GetFilename());
}
}
}
// Get the reference transformation. We use the first static mesh as reference
// transformation, and thus as the position of the corresponding rigid body.
hkvMat4 referenceTransform = meshInstances[0]->GetTransform();
// Remove any scaling from the reference matrix. This one has to be applied to
// the Havok shapes, and thus needs to be part of the mesh transforms.
referenceTransform.setScalingFactors(hkvVec3 (1));
// We need the inverse referenceTransform to transform each instance into reference space
referenceTransform.invert();
referenceTransform.setRow (3, hkvVec4 (0, 0, 0, 1));
// Determine collision type from first static mesh instance.
const VisStaticMeshInstance_cl *pMeshInstance = meshInstances[0];
VisStaticMesh_cl *pMesh = pMeshInstance->GetMesh();
IVCollisionMesh *pColMesh = pMesh->GetCollisionMesh(true, true);
const bool bIsConvex = pColMesh->GetType()==VIS_COLMESH_GEOTYPE_CONVEXHULL;
// Only create a convex shape if a single mesh instance is used, since otherwise merging multiple mesh instances in one single convex hull
// will provide in most cases not the desired behavior. Moreover we can only create either a convex hull or a concave mesh shape, therefore
// mesh instances with different collision type can't be merged into one shape.
hkpShape *pShape = (bIsConvex && iCount==1) ?
CreateConvexShapeFromStaticMeshInstances(meshInstances, referenceTransform, bShrinkByCvxRadius) :
CreateMeshShapeFromStaticMeshInstances(meshInstances, referenceTransform, bAllowPerTriCollisionInfo, eWeldingType);
// We are just caching single static mesh instances and no static mesh collections.
if (iCount == 1)
{
*szShapeCacheId = AddShape(szShapeId, pShape);
// Only cache shape to HKT file when inside vForge or when enforced.
if ((Vision::Editor.IsInEditor() && bAllowStaticMeshCaching) || bForceHktShapeCaching)
{
if (bIsConvex)
vHavokCachedShape::SaveConvexShape(meshInstances[0]->GetMesh(), vScale, bShrinkByCvxRadius, (hkvConvexVerticesShape*)pShape);
else
vHavokCachedShape::SaveMeshShape(meshInstances[0]->GetMesh(), vScale, meshInstances[0]->GetCollisionBehavior(), eWeldingType, (hkvBvCompressedMeshShape*)pShape);
}
}
return pShape;
}