Init
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of NVIDIA CORPORATION nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2008-2021 NVIDIA Corporation. All rights reserved.
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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
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// ****************************************************************************
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// This snippet creates convex meshes with different cooking settings
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// and shows how these settings affect the convex mesh creation performance and
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// the size of the resulting cooked meshes.
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// ****************************************************************************
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#include <ctype.h>
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#include "PxPhysicsAPI.h"
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#include "../snippetutils/SnippetUtils.h"
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using namespace physx;
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PxDefaultAllocator gAllocator;
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PxDefaultErrorCallback gErrorCallback;
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PxFoundation* gFoundation = NULL;
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PxPhysics* gPhysics = NULL;
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PxCooking* gCooking = NULL;
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float rand(float loVal, float hiVal)
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{
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return loVal + (float(rand())/float(RAND_MAX))*(hiVal - loVal);
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}
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template<PxConvexMeshCookingType::Enum convexMeshCookingType, bool directInsertion, PxU32 gaussMapLimit>
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void createRandomConvex(PxU32 numVerts, const PxVec3* verts)
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{
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PxCookingParams params = gCooking->getParams();
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// Use the new (default) PxConvexMeshCookingType::eQUICKHULL
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params.convexMeshCookingType = convexMeshCookingType;
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// If the gaussMapLimit is chosen higher than the number of output vertices, no gauss map is added to the convex mesh data (here 256).
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// If the gaussMapLimit is chosen lower than the number of output vertices, a gauss map is added to the convex mesh data (here 16).
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params.gaussMapLimit = gaussMapLimit;
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gCooking->setParams(params);
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// Setup the convex mesh descriptor
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PxConvexMeshDesc desc;
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// We provide points only, therefore the PxConvexFlag::eCOMPUTE_CONVEX flag must be specified
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desc.points.data = verts;
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desc.points.count = numVerts;
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desc.points.stride = sizeof(PxVec3);
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desc.flags = PxConvexFlag::eCOMPUTE_CONVEX;
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PxU32 meshSize = 0;
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PxConvexMesh* convex = NULL;
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PxU64 startTime = SnippetUtils::getCurrentTimeCounterValue();
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if(directInsertion)
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{
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// Directly insert mesh into PhysX
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convex = gCooking->createConvexMesh(desc, gPhysics->getPhysicsInsertionCallback());
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PX_ASSERT(convex);
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}
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else
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{
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// Serialize the cooked mesh into a stream.
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PxDefaultMemoryOutputStream outStream;
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bool res = gCooking->cookConvexMesh(desc, outStream);
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PX_UNUSED(res);
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PX_ASSERT(res);
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meshSize = outStream.getSize();
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// Create the mesh from a stream.
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PxDefaultMemoryInputData inStream(outStream.getData(), outStream.getSize());
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convex = gPhysics->createConvexMesh(inStream);
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PX_ASSERT(convex);
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}
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// Print the elapsed time for comparison
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PxU64 stopTime = SnippetUtils::getCurrentTimeCounterValue();
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float elapsedTime = SnippetUtils::getElapsedTimeInMilliseconds(stopTime - startTime);
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printf("\t -----------------------------------------------\n");
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printf("\t Create convex mesh with %d triangles: \n", numVerts);
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directInsertion ? printf("\t\t Direct mesh insertion enabled\n") : printf("\t\t Direct mesh insertion disabled\n");
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printf("\t\t Gauss map limit: %d \n", gaussMapLimit);
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printf("\t\t Created hull number of vertices: %d \n", convex->getNbVertices());
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printf("\t\t Created hull number of polygons: %d \n", convex->getNbPolygons());
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printf("\t Elapsed time in ms: %f \n", double(elapsedTime));
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if (!directInsertion)
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{
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printf("\t Mesh size: %d \n", meshSize);
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}
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convex->release();
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}
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void createConvexMeshes()
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{
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const PxU32 numVerts = 64;
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PxVec3* vertices = new PxVec3[numVerts];
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// Prepare random verts
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for(PxU32 i = 0; i < numVerts; i++)
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{
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vertices[i] = PxVec3(rand(-20.0f, 20.0f), rand(-20.0f, 20.0f), rand(-20.0f, 20.0f));
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}
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// Create convex mesh using the quickhull algorithm with different settings
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printf("-----------------------------------------------\n");
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printf("Create convex mesh using the quickhull algorithm: \n\n");
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// The default convex mesh creation serializing to a stream, useful for offline cooking.
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createRandomConvex<PxConvexMeshCookingType::eQUICKHULL, false, 16>(numVerts, vertices);
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// The default convex mesh creation without the additional gauss map data.
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createRandomConvex<PxConvexMeshCookingType::eQUICKHULL, false, 256>(numVerts, vertices);
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// Convex mesh creation inserting the mesh directly into PhysX.
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// Useful for runtime cooking.
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createRandomConvex<PxConvexMeshCookingType::eQUICKHULL, true, 16>(numVerts, vertices);
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// Convex mesh creation inserting the mesh directly into PhysX, without gauss map data.
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// Useful for runtime cooking.
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createRandomConvex<PxConvexMeshCookingType::eQUICKHULL, true, 256>(numVerts, vertices);
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delete [] vertices;
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}
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void initPhysics()
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{
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gFoundation = PxCreateFoundation(PX_PHYSICS_VERSION, gAllocator, gErrorCallback);
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gPhysics = PxCreatePhysics(PX_PHYSICS_VERSION, *gFoundation, PxTolerancesScale(),true);
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gCooking = PxCreateCooking(PX_PHYSICS_VERSION, *gFoundation, PxCookingParams(PxTolerancesScale()));
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}
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void cleanupPhysics()
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{
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gPhysics->release();
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gCooking->release();
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gFoundation->release();
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printf("SnippetConvexMeshCreate done.\n");
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}
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int snippetMain(int, const char*const*)
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{
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initPhysics();
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createConvexMeshes();
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cleanupPhysics();
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return 0;
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}
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