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Added support for rapid movement of the emitter, with particle now seeding between

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the position of the emitter in the previous frame and the new position in the new
frame, the number of particles added also scales up to compensate for this movement.
This commit is contained in:
Robert Osfield
2005-08-25 14:12:08 +00:00
parent 320d0f67e4
commit be285c62c0
14 changed files with 183 additions and 28 deletions
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22
include/osgParticle/Particle
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@@ -178,6 +178,9 @@ namespace osgParticle
/// Transform position and velocity vectors by a matrix.
inline void transformPositionVelocity(const osg::Matrix& xform);
/// Transform position and velocity vectors by a combination of two matrices
void Particle::transformPositionVelocity(const osg::Matrix& xform1, const osg::Matrix& xform2, float r);
/// Set the angle vector.
inline void setAngle(const osg::Vec3& a);
@@ -410,14 +413,19 @@ namespace osgParticle
inline void Particle::transformPositionVelocity(const osg::Matrix& xform)
{
// this should be optimized!
osg::Vec3 p1 = _position + _velocity;
_position = xform.preMult(_position);
p1 = xform.preMult(p1);
_velocity = p1 - _position;
_velocity = osg::Matrix::transform3x3(_velocity, xform);
}
inline void Particle::transformPositionVelocity(const osg::Matrix& xform1, const osg::Matrix& xform2, float r)
{
osg::Vec3 position1 = xform1.preMult(_position);
osg::Vec3 velocity1 = osg::Matrix::transform3x3(_velocity, xform1);
osg::Vec3 position2 = xform2.preMult(_position);
osg::Vec3 velocity2 = osg::Matrix::transform3x3(_velocity, xform2);
float one_minus_r = 1.0f-r;
_position = position1*r + position2*one_minus_r;
_velocity = velocity1*r + velocity2*one_minus_r;
}
inline void Particle::setAngle(const osg::Vec3& a)