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- //
- // Redistribution and use in source and binary forms, with or without
- // modification, are permitted provided that the following conditions
- // are met:
- // * Redistributions of source code must retain the above copyright
- // notice, this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above copyright
- // notice, this list of conditions and the following disclaimer in the
- // documentation and/or other materials provided with the distribution.
- // * Neither the name of NVIDIA CORPORATION nor the names of its
- // contributors may be used to endorse or promote products derived
- // from this software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
- // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- // OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- //
- // Copyright (c) 2008-2021 NVIDIA Corporation. All rights reserved.
- // Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
- // Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
-
- #include "MeshBuilder.h"
- #include "GuInternal.h"
-
- namespace physx
- {
- //#define PROFILE_BOUNDS
- #ifdef PROFILE_BOUNDS
- #include <windows.h>
- #pragma comment(lib, "winmm.lib")
- #endif
-
- void MeshBulider::computeLocalBounds(Gu::MeshDataBase& meshData)
- {
- #ifdef PROFILE_BOUNDS
- int time = timeGetTime();
- #endif
-
- PxBounds3& localBounds = meshData.mAABB;
- Gu::computeBoundsAroundVertices(localBounds, meshData.mNbVertices, meshData.mVertices);
-
- // Derive a good geometric epsilon from local bounds. We must do this before bounds extrusion for heightfields.
- //
- // From Charles Bloom:
- // "Epsilon must be big enough so that the consistency condition abs(D(Hit))
- // <= Epsilon is satisfied for all queries. You want the smallest epsilon
- // you can have that meets that constraint. Normal floats have a 24 bit
- // mantissa. When you do any float addition, you may have round-off error
- // that makes the result off by roughly 2^-24 * result. Our result is
- // scaled by the position values. If our world is strictly required to be
- // in a box of world size W (each coordinate in -W to W), then the maximum
- // error is 2^-24 * W. Thus Epsilon must be at least >= 2^-24 * W. If
- // you're doing coordinate transforms, that may scale your error up by some
- // amount, so you'll need a bigger epsilon. In general something like
- // 2^-22*W is reasonable. If you allow scaled transforms, it needs to be
- // something like 2^-22*W*MAX_SCALE."
- // PT: TODO: runtime checkings for this
- PxReal geomEpsilon = 0.0f;
- for (PxU32 i = 0; i < 3; i++)
- geomEpsilon = PxMax(geomEpsilon, PxMax(PxAbs(localBounds.maximum[i]), PxAbs(localBounds.minimum[i])));
- geomEpsilon *= powf(2.0f, -22.0f);
- meshData.mGeomEpsilon = geomEpsilon;
-
- #ifdef PROFILE_BOUNDS
- int deltaTime = timeGetTime() - time;
- printf("Bounds time: %f\n", float(deltaTime)*0.001f);
- #endif
- }
-
- }