//////////////////////////////////////////////////////////////////////////
// GaBallComponent
//virtual
void GaBallComponent::update( BcReal Tick )
{
// Setup rotation.
BcQuat Rotation;
Rotation.fromEular( Rotation_, 0.0f, 0.0f );
Rotation_ += Tick;
//getParentEntity()->setRotation( Rotation );
// Move ball.
const BcVec3d& Position = getParentEntity()->getMatrix().translation();
BcVec3d NewPosition = Position + Velocity_ * Tick;
if( NewPosition.x() < -18.0f || NewPosition.x() > 18.0f )
{
NewPosition -= BcVec3d( Velocity_.x(), 0.0f, 0.0f ) * Tick;
Velocity_.x( -Velocity_.x() );
}
if( NewPosition.z() < -10.0f || NewPosition.z() > 10.0f )
{
NewPosition -= BcVec3d( 0.0f, 0.0f, Velocity_.z() ) * Tick;
Velocity_.z( -Velocity_.z() );
}
getParentEntity()->setPosition( NewPosition );
}
void BcMat4d::rotation( const BcVec3d& Angles )
{
BcReal sy, sp, sr;
BcReal cy, cp, cr;
sy = BcSin( Angles.y() );
sp = BcSin( Angles.x() );
sr = BcSin( Angles.z() );
cy = BcCos( Angles.y() );
cp = BcCos( Angles.x() );
cr = BcCos( Angles.z() );
Row0_.set( cy * cr + sy * sp * sr, -cy * sr + sy * sp * cr, sy * cp, 0.0f );
Row1_.set( sr * cp, cr * cp, -sp, 0.0f );
Row2_.set( -sy * cr + cy * sp * sr, sr * sy + cy * sp * cr, cy * cp, 0.0f );
}
//////////////////////////////////////////////////////////////////////////
// lookAt
void BcMat4d::lookAt( const BcVec3d& Position, const BcVec3d& LookAt, const BcVec3d& UpVec )
{
const BcVec3d Front = ( Position - LookAt ).normal();
const BcVec3d Side = Front.cross( UpVec ).normal();
const BcVec3d Up = Side.cross( Front ).normal();
BcMat4d RotMatrix( BcVec4d( Side.x(), Up.x(), -Front.x(), 0.0f ),
BcVec4d( Side.y(), Up.y(), -Front.y(), 0.0f ),
BcVec4d( Side.z(), Up.z(), -Front.z(), 0.0f ),
BcVec4d( 0.0f, 0.0f, 0.0f, 1.0f ) );
BcMat4d TransMatrix( BcVec4d( 1.0f, 0.0f, 0.0f, 0.0f ),
BcVec4d( 0.0f, 1.0f, 0.0f, 0.0f ),
BcVec4d( 0.0f, 0.0f, 1.0f, 0.0f ),
BcVec4d( -Position.x(), -Position.y(), -Position.z(), 1.0f ) );
(*this) = TransMatrix * RotMatrix;
}
void BcMat4d::scale( const BcVec3d& Scale )
{
scale( BcVec4d( Scale.x(), Scale.y(), Scale.z(), 1.0f ) );
}
void BcMat4d::translation( const BcVec3d& Translation )
{
translation( BcVec4d( Translation.x(), Translation.y(), Translation.z(), 1.0f ) );
}
//////////////////////////////////////////////////////////////////////////
// buildTangents
void MdlMesh::buildTangents()
{
BcVec3d* pTan1 = new BcVec3d[ aVertices_.size() * 2 ];
BcVec3d* pTan2 = pTan1 + aVertices_.size();
memset( pTan1, 0, sizeof( BcVec3d ) * aVertices_.size() * 2 );
for ( BcU32 i = 0; i < ( aIndices_.size() / 3 ); ++i )
{
BcU32 TA = aIndices_[ ( i * 3 ) + 0 ].iVertex_;
BcU32 TB = aIndices_[ ( i * 3 ) + 1 ].iVertex_;
BcU32 TC = aIndices_[ ( i * 3 ) + 2 ].iVertex_;
MdlVertex& VertA = aVertices_[ TA ];
MdlVertex& VertB = aVertices_[ TB ];
MdlVertex& VertC = aVertices_[ TC ];
BcVec3d VertPosA = VertA.Position_;
BcVec3d VertPosB = VertB.Position_;
BcVec3d VertPosC = VertC.Position_;
BcVec2d VertUVA = VertA.UV_;
BcVec2d VertUVB = VertB.UV_;
BcVec2d VertUVC = VertC.UV_;
BcReal X1 = VertPosB.x() - VertPosA.x();
BcReal X2 = VertPosC.x() - VertPosA.x();
BcReal Y1 = VertPosB.y() - VertPosA.y();
BcReal Y2 = VertPosC.y() - VertPosA.y();
BcReal Z1 = VertPosB.z() - VertPosA.z();
BcReal Z2 = VertPosC.z() - VertPosA.z();
BcReal S1 = VertUVB.x() - VertUVA.x();
BcReal S2 = VertUVC.x() - VertUVA.x();
BcReal T1 = VertUVB.y() - VertUVA.y();
BcReal T2 = VertUVC.y() - VertUVA.y();
BcReal InvR = ( S1 * T2 - S2 * T1 );
BcReal R = 1.0f / InvR;
// Validation so it doesn't break everything, just set to a dummy value.
if( BcAbs( InvR ) < 1e6f )
{
R = 0.0f;
}
BcVec3d SDir( ( T2 * X1 - T1 * X2 ) * R, ( T2 * Y1 - T1 * Y2 ) * R, ( T2 * Z1 - T1 * Z2 ) * R );
BcVec3d TDir( ( S1 * X2 - S2 * X1 ) * R, ( S1 * Y2 - S2 * Y1 ) * R, ( S1 * Z2 - S2 * Z1 ) * R );
pTan1[ TA ] += SDir;
pTan1[ TB ] += SDir;
pTan1[ TC ] += SDir;
pTan2[ TA ] += TDir;
pTan2[ TB ] += TDir;
pTan2[ TC ] += TDir;
}
for ( BcU32 i = 0; i < aVertices_.size(); ++i )
{
MdlVertex& Vert = aVertices_[ i ];
BcVec3d Tangent;
const BcVec3d N = Vert.Normal_;
const BcVec3d& T = pTan1[ i ];
Tangent = ( T - N * N.dot( T ) );
Tangent.normalise();
// Calculate handedness
BcReal W = ( N.cross( T ).dot( pTan2[ i ] ) < 0.0f ) ? -1.0f : 1.0f;
if ( W < 0.0f )
{
Tangent = -Tangent;
}
Vert.bTangent_ = BcTrue;
Vert.Tangent_ = Tangent;
// Validate, and create a dummy value.
BcReal Mag = Tangent.magnitude();
if( BcAbs( Mag - 1.0f ) > 0.0001f )
{
Vert.Tangent_.set( 0.0f, 0.0f, 0.0f );
}
}
delete[] pTan1;
}
//////////////////////////////////////////////////////////////////////////
// buildBindPose
void MD5MeshLoader::buildBindPose( MdlNode* pNode, BcU32 iMesh )
{
// Skin the mesh.
MD5_Joint* pJoints = pJoint( 0 );
MD5_Mesh* pMeshes = pMesh( iMesh );
// This node is a mesh if we have 1 joint, skin if we have more.
MdlMesh* pMesh = NULL;
if( nJoints_ == 1 )
{
pNode->type( eNT_MESH );
pMesh = pNode->pMeshObject();
}
else
{
pNode->type( eNT_SKIN );
pMesh = pNode->pSkinObject();
}
// Add material.
MdlMaterial Material;
Material.default3d();
Material.Name_ = pMeshes->Shader_;
BcU32 iMaterial = pMesh->addMaterial( Material );
// Add indices.
for( BcU32 i = 0; i < pMeshes->nIndices_; ++i )
{
MdlIndex Index;
Index.iMaterial_ = iMaterial;
Index.iVertex_ = pMeshes->pIndices_[ i ];
pMesh->addIndex( Index );
}
BcVec3d WeightPos;
for ( BcU32 i = 0; i < pMeshes->nVerts_; ++i )
{
MD5_Vert* pMD5Vert = &pMeshes->pVerts_[ i ];
BcVec3d Position( 0.0f, 0.0f, 0.0f );
// Setup vertex.
MdlVertex Vert;
Vert.bUV_ = BcTrue;
Vert.UV_.x( pMD5Vert->U_ );
Vert.UV_.y( pMD5Vert->V_ );
for ( BcU32 j = 0; j < 4; ++j )
{
Vert.Weights_[ j ] = 0.0f;
Vert.iJoints_[ j ] = 0;
}
// Get bind pose vertex.
Vert.nWeights_ = 0;
for ( BcU32 j = 0; j < pMD5Vert->nWeights_; ++j )
{
if ( j > 4 )
{
break;
}
BcU32 WeightIndex = pMD5Vert->WeightIndex_ + j;
MD5_Weight* pMD5Weight = &pMeshes->pWeights_[ WeightIndex ];
// Fix up a joint.
MD5_Joint* pJoint = &pJoints[ pMD5Weight->JointID_ ];
BcVec3d JointTran( pJoint->TX_, pJoint->TY_, pJoint->TZ_ );
BcQuat JointRot( pJoint->QX_, pJoint->QY_, pJoint->QZ_, 0.0f );
JointRot.calcFromXYZ();
//
const BcReal WeightVal = pMD5Weight->Weight_;
WeightPos.set( pMD5Weight->X_, pMD5Weight->Y_, pMD5Weight->Z_ );
JointRot.rotateVector( WeightPos );
Position += ( WeightPos + JointTran ) * WeightVal;
// Setup vertex indices and weights:
Vert.iJoints_[ j ] = pMD5Weight->JointID_;
Vert.Weights_[ j ] = WeightVal;
Vert.nWeights_++;
}
// Correct weights.
BcReal WeightTotal = 0.0f;
for( BcU32 j = 0; j < Vert.nWeights_; ++j )
{
WeightTotal += Vert.Weights_[ j ];
}
for( BcU32 j = 0; j < Vert.nWeights_; ++j )
{
Vert.Weights_[ j ] = Vert.Weights_[ j ] / WeightTotal;
}
Vert.bPosition_ = BcTrue;
Vert.Position_ = Position;
pMesh->addVertex( Vert );
}
pMesh->sortIndicesByMaterial();
pMesh->buildNormals();
pMesh->buildTangents();
// Setup AABB to be larger than the skin to account for motion.
BcAABB AABB = pMesh->findAABB();
AABB.min( AABB.min() * 1.5f );
AABB.max( AABB.max() * 1.5f );
pNode->aabb( AABB );
// TODO: Refine into bone palettes properly.
}
