//----------------------------------------------------------------//
void ZLPrism::GetAABB ( ZLBox& box ) const {
ZLVec3D walker = mLoc;
box.Init ( walker );
walker.Add ( mYAxis );
box.Grow ( walker );
walker.Add ( mZAxis );
box.Grow ( walker );
walker.Sub ( mYAxis );
box.Grow ( walker );
walker.Add ( mXAxis );
box.Grow ( walker );
walker.Sub ( mZAxis );
box.Grow ( walker );
walker.Add ( mYAxis );
box.Grow ( walker );
walker.Add ( mZAxis );
box.Grow ( walker );
}
//----------------------------------------------------------------//
void ZLPrism::GetCenter ( ZLVec3D& center ) const {
center = this->mXAxis;
center.Add ( this->mYAxis );
center.Add ( this->mZAxis );
center.Scale ( 0.5f );
center.Add ( this->mLoc );
}
//----------------------------------------------------------------//
void ZLQuaternion::Multiply ( const ZLQuaternion& rhs ) {
ZLVec3D cross;
cross.Cross ( mV, rhs.mV );
ZLVec3D resultVec;
resultVec.Init ( rhs.mV );
resultVec.Scale ( mS );
ZLVec3D scaledVec;
scaledVec.Init ( mV );
scaledVec.Scale ( rhs.mS );
resultVec.Add ( scaledVec );
resultVec.Sub ( cross );
mS = mS * rhs.mS - mV.Dot ( rhs.mV );
mV.Init ( resultVec );
}
//----------------------------------------------------------------//
void MOAIParticleForce::Eval ( const ZLVec3D& loc, float mass, ZLVec3D& acceleration, ZLVec3D& offset ) {
ZLVec3D force ( 0.0f, 0.0f, 0.0f );
ZLVec3D origin = this->mLocalToWorldMtx.GetTranslation ();
switch ( this->mShape ) {
case ATTRACTOR: {
ZLVec3D vec = origin;
vec.Sub ( loc );
float dist = vec.NormSafe () / this->mRadius;
if ( dist <= 1.0f ) {
dist = 1.0f - dist;
dist = dist * dist * this->mPull;
force.mX = vec.mX * dist;
force.mY = vec.mY * dist;
}
break;
}
case BASIN: {
ZLVec3D vec = origin;
vec.Sub ( loc );
float dist = vec.NormSafe () / this->mRadius;
dist = dist * dist * this->mPull;
force.mX = vec.mX * dist;
force.mY = vec.mY * dist;
break;
}
case LINEAR: {
force = this->mWorldVec;
break;
}
case RADIAL: {
force = origin;
force.Sub ( loc );
force.NormSafe ();
force.Scale ( this->mPull );
break;
}
}
switch ( this->mType ) {
case FORCE:
force.Scale ( 1.0f / mass );
acceleration.Add ( force );
break;
case GRAVITY:
acceleration.Add ( force );
break;
case OFFSET:
offset.Add ( force );
break;
}
}