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66 lines
2.6 KiB
66 lines
2.6 KiB
4 years ago
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/*
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This file is part of Magnum.
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
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2020, 2021 Vladimír Vondruš <mosra@centrum.cz>
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <Corrade/Containers/Array.h>
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#include <Corrade/Containers/Pair.h>
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#include "Magnum/Math/Matrix4.h"
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#include "Magnum/SceneTools/OrderClusterParents.h"
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#include "Magnum/Trade/SceneData.h"
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#define DOXYGEN_ELLIPSIS(...) __VA_ARGS__
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using namespace Magnum;
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int main() {
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{
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/* [orderClusterParents-transformations] */
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Trade::SceneData scene = DOXYGEN_ELLIPSIS(Trade::SceneData{{}, 0, nullptr, {}});
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/* Put all transformations into an array indexed by object ID. Objects
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implicitly have an identity transformation, first element is reserved for
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the global transformation. */
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Containers::Array<Matrix4> transformations{std::size_t(scene.mappingBound() + 1)};
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for(const Containers::Pair<UnsignedInt, Matrix4>& transformation:
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scene.transformations3DAsArray())
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{
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transformations[transformation.first() + 1] = transformation.second();
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}
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/* Go through ordered parents and compose absolute transformations for all
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nodes in the hierarchy, objects in the root use transformations[0]. The
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function ensures that the parent transformation is already calculated when
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referenced by child nodes. */
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for(const Containers::Pair<UnsignedInt, Int>& parent:
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SceneTools::orderClusterParents(scene))
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{
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transformations[parent.first() + 1] =
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transformations[parent.second() + 1]*
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transformations[parent.first() + 1];
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}
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/* [orderClusterParents-transformations] */
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}
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}
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