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- Further work at the BVH loader. Still work in progress.

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- Added a helper class to build a mesh for a meshless node hierarchy

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@189 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
This commit is contained in:
ulfjorensen
2008-10-19 21:44:12 +00:00
parent a34378934d
commit 8271164d74
7 changed files with 610 additions and 42 deletions
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252
code/BVHLoader.cpp
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@@ -13,18 +13,18 @@ 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.
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.
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 the ASSIMP team, nor the names of its
contributors may be used to endorse or promote products
derived from this software without specific prior
written permission of the ASSIMP Development Team.
contributors may be used to endorse or promote products
derived from this software without specific prior
written permission of the ASSIMP Development Team.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
@@ -41,8 +41,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "AssimpPCH.h"
#include "../include/aiAnim.h"
#include "BVHLoader.h"
#include "fast_atof.h"
#include "SkeletonMeshBuilder.h"
using namespace Assimp;
@@ -99,6 +101,12 @@ void BVHLoader::InternReadFile( const std::string& pFile, aiScene* pScene, IOSys
mReader = mBuffer.begin();
mLine = 1;
ReadStructure( pScene);
// build a dummy mesh for the skeleton so that we see something at least
SkeletonMeshBuilder meshBuilder( pScene);
// construct an animation from all the motion data we read
CreateAnimation( pScene);
}
// ------------------------------------------------------------------------------------------------
@@ -139,10 +147,6 @@ aiNode* BVHLoader::ReadNode()
if( nodeName.empty() || nodeName == "{")
ThrowException( boost::str( boost::format( "Expected node name, but found \"%s\".") % nodeName));
// HACK: (thom) end nodes are called "End Site". If the name of the node is "Site", we know it's going to be an end node
if( nodeName == "Site")
nodeName = "End Site";
// then an opening brace should follow
std::string openBrace = GetNextToken();
if( openBrace != "{")
@@ -152,30 +156,39 @@ aiNode* BVHLoader::ReadNode()
aiNode* node = new aiNode( nodeName);
std::vector<aiNode*> childNodes;
// and create an bone entry for it
mNodes.push_back( Node( node));
Node& internNode = mNodes.back();
// now read the node's contents
while( 1)
{
std::string token = GetNextToken();
// node offset to parent node
if( token == "OFFSET")
ReadNodeOffset( node);
else if( token == "CHANNELS")
ReadNodeChannels( node);
ReadNodeChannels( internNode);
else if( token == "JOINT")
{
// child node follows
aiNode* child = ReadNode();
child->mParent = node;
childNodes.push_back( child);
} else
if( token == "End")
}
else if( token == "End")
{
// HACK: (thom) end child node follows. Full token is "End Site", then no name, then a node.
// But I don't want to write another function for this, so I simply leave the "Site" for ReadNode() as a node name
aiNode* child = ReadNode();
// The real symbol is "End Site". Second part comes in a separate token
std::string siteToken = GetNextToken();
if( siteToken != "Site")
ThrowException( boost::str( boost::format( "Expected \"End Site\" keyword, but found \"%s %s\".") % token % siteToken));
aiNode* child = ReadEndSite( nodeName);
child->mParent = node;
childNodes.push_back( child);
} else
if( token == "}")
}
else if( token == "}")
{
// we're done with that part of the hierarchy
break;
@@ -198,6 +211,42 @@ aiNode* BVHLoader::ReadNode()
return node;
}
// ------------------------------------------------------------------------------------------------
// Reads an end node and returns the created node.
aiNode* BVHLoader::ReadEndSite( const std::string& pParentName)
{
// check opening brace
std::string openBrace = GetNextToken();
if( openBrace != "{")
ThrowException( boost::str( boost::format( "Expected opening brace \"{\", but found \"%s\".") % openBrace));
// Create a node
aiNode* node = new aiNode( "EndSite_" + pParentName);
// now read the node's contents. Only possible entry is "OFFSET"
while( 1)
{
std::string token = GetNextToken();
// end node's offset
if( token == "OFFSET")
{
ReadNodeOffset( node);
}
else if( token == "}")
{
// we're done with the end node
break;
} else
{
// everything else is a parse error
ThrowException( boost::str( boost::format( "Unknown keyword \"%s\".") % token));
}
}
// and return the sub-hierarchy we built here
return node;
}
// ------------------------------------------------------------------------------------------------
// Reads a node offset for the given node
void BVHLoader::ReadNodeOffset( aiNode* pNode)
@@ -215,15 +264,31 @@ void BVHLoader::ReadNodeOffset( aiNode* pNode)
// ------------------------------------------------------------------------------------------------
// Reads the animation channels for the given node
void BVHLoader::ReadNodeChannels( aiNode* pNode)
void BVHLoader::ReadNodeChannels( BVHLoader::Node& pNode)
{
// number of channels. Use the float reader because we're lazy
float numChannelsFloat = GetNextTokenAsFloat();
unsigned int numChannels = (unsigned int) numChannelsFloat;
// TODO: (thom) proper channel parsing. For the moment I just skip the number of tokens
for( unsigned int a = 0; a < numChannels; a++)
GetNextToken();
{
std::string channelToken = GetNextToken();
if( channelToken == "Xposition")
pNode.mChannels.push_back( Channel_PositionX);
else if( channelToken == "Yposition")
pNode.mChannels.push_back( Channel_PositionY);
else if( channelToken == "Zposition")
pNode.mChannels.push_back( Channel_PositionZ);
else if( channelToken == "Xrotation")
pNode.mChannels.push_back( Channel_RotationX);
else if( channelToken == "Yrotation")
pNode.mChannels.push_back( Channel_RotationY);
else if( channelToken == "Zrotation")
pNode.mChannels.push_back( Channel_RotationZ);
else
ThrowException( boost::str( boost::format( "Invalid channel specifier \"%s\".") % channelToken));
}
}
// ------------------------------------------------------------------------------------------------
@@ -236,7 +301,7 @@ void BVHLoader::ReadMotion( aiScene* pScene)
ThrowException( boost::str( boost::format( "Expected frame count \"Frames:\", but found \"%s\".") % tokenFrames));
float numFramesFloat = GetNextTokenAsFloat();
unsigned int numFrames = (unsigned int) numFramesFloat;
mAnimNumFrames = (unsigned int) numFramesFloat;
// Read frame duration
std::string tokenDuration1 = GetNextToken();
@@ -244,11 +309,25 @@ void BVHLoader::ReadMotion( aiScene* pScene)
if( tokenDuration1 != "Frame" || tokenDuration2 != "Time:")
ThrowException( boost::str( boost::format( "Expected frame duration \"Frame Time:\", but found \"%s %s\".") % tokenDuration1 % tokenDuration2));
float frameDuration = GetNextTokenAsFloat();
mAnimTickDuration = GetNextTokenAsFloat();
// resize value array accordingly
// ************* Continue here ********
//mMotionValues.resize( boost::extents[numFrames][numChannels]);
// resize value vectors for each node
for( std::vector<Node>::iterator it = mNodes.begin(); it != mNodes.end(); ++it)
it->mChannelValues.reserve( it->mChannels.size() * mAnimNumFrames);
// now read all the data and store it in the corresponding node's value vector
for( unsigned int frame = 0; frame < mAnimNumFrames; ++frame)
{
// on each line read the values for all nodes
for( std::vector<Node>::iterator it = mNodes.begin(); it != mNodes.end(); ++it)
{
// get as many values as the node has channels
for( unsigned int c = 0; c < it->mChannels.size(); ++c)
it->mChannelValues.push_back( GetNextTokenAsFloat());
}
// after one frame worth of values for all nodes there should be a newline, but we better don't rely on it
}
}
// ------------------------------------------------------------------------------------------------
@@ -312,3 +391,118 @@ void BVHLoader::ThrowException( const std::string& pError)
{
throw new ImportErrorException( boost::str( boost::format( "%s:%d - %s") % mFileName % mLine % pError));
}
// ------------------------------------------------------------------------------------------------
// Constructs an animation for the motion data and stores it in the given scene
void BVHLoader::CreateAnimation( aiScene* pScene)
{
// create the animation
pScene->mNumAnimations = 1;
pScene->mAnimations = new aiAnimation*[1];
aiAnimation* anim = new aiAnimation;
pScene->mAnimations[0] = anim;
// put down the basic parameters
anim->mName.Set( "Motion");
anim->mTicksPerSecond = 1.0 / double( mAnimTickDuration);
anim->mDuration = double( mAnimNumFrames - 1);
// now generate the tracks for all nodes
anim->mNumChannels = mNodes.size();
anim->mChannels = new aiNodeAnim*[anim->mNumChannels];
for( unsigned int a = 0; a < anim->mNumChannels; a++)
{
const Node& node = mNodes[a];
const char* nodeName = node.mNode->mName.data;
aiNodeAnim* nodeAnim = new aiNodeAnim;
anim->mChannels[a] = nodeAnim;
nodeAnim->mNodeName.Set( std::string( nodeName));
// translational part, if given
if( node.mChannels.size() == 6)
{
if( node.mChannels[0] != Channel_PositionX || node.mChannels[1] != Channel_PositionY
|| node.mChannels[2] != Channel_PositionZ)
{
throw new ImportErrorException( boost::str( boost::format( "Unexpected animation "
"channel setup at node \"%s\".") % nodeName));
}
nodeAnim->mNumPositionKeys = mAnimNumFrames;
nodeAnim->mPositionKeys = new aiVectorKey[mAnimNumFrames];
aiVectorKey* poskey = nodeAnim->mPositionKeys;
for( unsigned int fr = 0; fr < mAnimNumFrames; ++fr)
{
poskey->mTime = double( fr);
poskey->mValue.x = node.mChannelValues[fr * node.mChannels.size() + 0];
poskey->mValue.y = node.mChannelValues[fr * node.mChannels.size() + 1];
poskey->mValue.z = node.mChannelValues[fr * node.mChannels.size() + 2];
++poskey;
}
} else
{
// if no translation part is given, put a default sequence
aiVector3D nodePos( node.mNode->mTransformation.a4, node.mNode->mTransformation.b4, node.mNode->mTransformation.c4);
nodeAnim->mNumPositionKeys = 2;
nodeAnim->mPositionKeys = new aiVectorKey[2];
nodeAnim->mPositionKeys[0].mTime = 0.0;
nodeAnim->mPositionKeys[0].mValue = nodePos;
nodeAnim->mPositionKeys[1].mTime = anim->mDuration;
nodeAnim->mPositionKeys[1].mValue = nodePos;
}
// rotation part. Always present. First find value offsets
{
unsigned int rotOffset = 0;
if( node.mChannels.size() == 6)
{
if( node.mChannels[3] != Channel_RotationZ || node.mChannels[4] != Channel_RotationX
|| node.mChannels[5] != Channel_RotationY)
{
throw new ImportErrorException( boost::str( boost::format( "Unexpected animation "
"channel setup at node \"%s\".") % nodeName));
}
rotOffset = 3;
} else
{
if( node.mChannels[0] != Channel_RotationZ || node.mChannels[1] != Channel_RotationX
|| node.mChannels[2] != Channel_RotationY || node.mChannels.size() != 3)
{
throw new ImportErrorException( boost::str( boost::format( "Unexpected animation "
"channel setup at node \"%s\".") % nodeName));
}
}
// Then create the number of rotation keys
nodeAnim->mNumRotationKeys = mAnimNumFrames;
nodeAnim->mRotationKeys = new aiQuatKey[mAnimNumFrames];
aiQuatKey* rotkey = nodeAnim->mRotationKeys;
for( unsigned int fr = 0; fr < mAnimNumFrames; ++fr)
{
// translate ZXY euler angels into a quaternion
float angleZ = node.mChannelValues[fr * node.mChannels.size() + rotOffset + 0] * float( AI_MATH_PI) / 180.0f;
float angleX = node.mChannelValues[fr * node.mChannels.size() + rotOffset + 1] * float( AI_MATH_PI) / 180.0f;
float angleY = node.mChannelValues[fr * node.mChannels.size() + rotOffset + 2] * float( AI_MATH_PI) / 180.0f;
aiMatrix4x4 temp;
aiMatrix3x3 rotMatrix;
aiMatrix4x4::RotationX( angleX, temp); rotMatrix *= aiMatrix3x3( temp);
aiMatrix4x4::RotationY( angleY, temp); rotMatrix *= aiMatrix3x3( temp);
aiMatrix4x4::RotationZ( angleZ, temp); rotMatrix *= aiMatrix3x3( temp);
rotkey->mTime = double( fr);
rotkey->mValue = aiQuaternion( rotMatrix);
++rotkey;
}
}
// scaling part. Always just a default track
{
nodeAnim->mNumScalingKeys = 2;
nodeAnim->mScalingKeys = new aiVectorKey[2];
nodeAnim->mScalingKeys[0].mTime = 0.0;
nodeAnim->mScalingKeys[0].mValue.Set( 1.0f, 1.0f, 1.0f);
nodeAnim->mScalingKeys[1].mTime = anim->mDuration;
nodeAnim->mScalingKeys[1].mValue.Set( 1.0f, 1.0f, 1.0f);
}
}
}