1 /** Calculates a pose for a given time of an animation */ 2 /* 3 --------------------------------------------------------------------------- 4 Open Asset Import Library (assimp) 5 --------------------------------------------------------------------------- 6 7 Copyright (c) 2006-2012, assimp team 8 9 All rights reserved. 10 11 Redistribution and use of this software in source and binary forms, 12 with or without modification, are permitted provided that the following 13 conditions are met: 14 15 * Redistributions of source code must retain the above 16 copyright notice, this list of conditions and the 17 following disclaimer. 18 19 * Redistributions in binary form must reproduce the above 20 copyright notice, this list of conditions and the 21 following disclaimer in the documentation and/or other 22 materials provided with the distribution. 23 24 * Neither the name of the assimp team, nor the names of its 25 contributors may be used to endorse or promote products 26 derived from this software without specific prior 27 written permission of the assimp team. 28 29 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 --------------------------------------------------------------------------- 41 */ 42 43 #ifndef AV_ANIMEVALUATOR_H_INCLUDED 44 #define AV_ANIMEVALUATOR_H_INCLUDED 45 46 #include <tuple> 47 #include <vector> 48 49 namespace AssimpView 50 { 51 52 /** Calculates transformations for a given timestamp from a set of animation tracks. Not directly useful, 53 * better use the AnimPlayer class. 54 */ 55 class AnimEvaluator 56 { 57 public: 58 /** Constructor on a given animation. The animation is fixed throughout the lifetime of 59 * the object. 60 * @param pAnim The animation to calculate poses for. Ownership of the animation object stays 61 * at the caller, the evaluator just keeps a reference to it as long as it persists. 62 */ 63 AnimEvaluator( const aiAnimation* pAnim); 64 65 /** Evaluates the animation tracks for a given time stamp. The calculated pose can be retrieved as a 66 * array of transformation matrices afterwards by calling GetTransformations(). 67 * @param pTime The time for which you want to evaluate the animation, in seconds. Will be mapped into the animation cycle, so 68 * it can be an arbitrary value. Best use with ever-increasing time stamps. 69 */ 70 void Evaluate( double pTime); 71 72 /** Returns the transform matrices calculated at the last Evaluate() call. The array matches the mChannels array of 73 * the aiAnimation. */ GetTransformations()74 const std::vector<aiMatrix4x4>& GetTransformations() const { return mTransforms; } 75 76 protected: 77 /** The animation we're working on */ 78 const aiAnimation* mAnim; 79 80 /** At which frame the last evaluation happened for each channel. 81 * Useful to quickly find the corresponding frame for slightly increased time stamps 82 */ 83 double mLastTime; 84 std::vector<std::tuple<unsigned int, unsigned int, unsigned int> > mLastPositions; 85 86 /** The array to store the transformations results of the evaluation */ 87 std::vector<aiMatrix4x4> mTransforms; 88 }; 89 90 } // end of namespace AssimpView 91 92 #endif // AV_ANIMEVALUATOR_H_INCLUDED 93