void Vertex::Rotate(const Vector3& centre, Vector3 amount)
{
//Begining of Glorious Hack!
//Apply changes for rotation around Z
if (amount.z != 0.0f)
{
Vector2 rotVect(x - centre.x, y - centre.y);
rotVect.ToPolar();
rotVect.x += amount.z;
rotVect.ToCartesian();
x = centre.x + rotVect.x;
y = centre.y + rotVect.y;
}
//Apply changes for rotation around Y
if (amount.y != 0.0f)
{
Vector2 rotVect(x - centre.x, z - centre.z);
rotVect.ToPolar();
rotVect.x += amount.y;
rotVect.ToCartesian();
x = centre.x + rotVect.x;
z = centre.z + rotVect.y; //which is actually the vertex's Z coordinate
}
//Apply changes for rotation around X
if (amount.x != 0.0f)
{
Vector2 rotVect(z - centre.z, y - centre.y);
rotVect.ToPolar();
rotVect.x += amount.x;
rotVect.ToCartesian();
z = centre.z + rotVect.x;
y = centre.y + rotVect.y;
}
//End of Glorious Hack!
}
void ParticleEmitter3D::PrepareEmitterParameters(Particle * particle, float32 velocity, int32 emitIndex)
{
Vector3 tempPosition = Vector3();
Matrix4 * worldTransformPtr = GetWorldTransformPtr();
if(worldTransformPtr)
{
tempPosition = worldTransformPtr->GetTranslationVector();
}
//Vector3 tempPosition = particlesFollow ? Vector3() : position;
if (emitterType == EMITTER_POINT)
{
particle->position = tempPosition;
}
else if (emitterType == EMITTER_LINE)
{
// TODO: add emitter angle support
float32 rand05 = (float32)Random::Instance()->RandFloat() - 0.5f; // [-0.5f, 0.5f]
Vector3 lineDirection(0, 0, 0);
if(size)
lineDirection = size->GetValue(time)*rand05;
particle->position = tempPosition + lineDirection;
}
else if (emitterType == EMITTER_RECT)
{
// TODO: add emitter angle support
float32 rand05_x = (float32)Random::Instance()->RandFloat() - 0.5f; // [-0.5f, 0.5f]
float32 rand05_y = (float32)Random::Instance()->RandFloat() - 0.5f; // [-0.5f, 0.5f]
float32 rand05_z = (float32)Random::Instance()->RandFloat() - 0.5f; // [-0.5f, 0.5f]
Vector3 lineDirection(0, 0, 0);
if(size)
lineDirection = Vector3(size->GetValue(time).x * rand05_x, size->GetValue(time).y * rand05_y, size->GetValue(time).z * rand05_z);
particle->position = tempPosition + lineDirection;
}
else if (emitterType == EMITTER_ONCIRCLE)
{
// here just set particle position
particle->position = tempPosition;
}
Vector3 vel = Vector3(1.0f, 0.0f, 0.0f);
if(emissionVector)
{
vel = emissionVector->GetValue(0);
vel = vel*rotationMatrix;
}
Vector3 rotVect(0, 0, 1);
float32 phi = PI*2*(float32)Random::Instance()->RandFloat();
if(vel.x != 0)
{
rotVect.y = sinf(phi);
rotVect.z = cosf(phi);
rotVect.x = - rotVect.y*vel.y/vel.x - rotVect.z*vel.z/vel.x;
}
else if(vel.y != 0)
{
rotVect.x = cosf(phi);
rotVect.z = sinf(phi);
rotVect.y = - rotVect.z*vel.z/vel.y;
}
else if(vel.z != 0)
{
rotVect.x = cosf(phi);
rotVect.y = sinf(phi);
rotVect.z = 0;
}
rotVect.Normalize();
float32 range = 0;
if(emissionRange)
range = DegToRad(emissionRange->GetValue(time) + angle);
float32 rand05 = (float32)Random::Instance()->RandFloat() - 0.5f;
Vector3 q_v(rotVect*sinf(range*rand05/2));
float32 q_w = cosf(range*rand05/2);
Vector3 q1_v(q_v);
float32 q1_w = -q_w;
q1_v /= (q_v.SquareLength() + q_w*q_w);
q1_w /= (q_v.SquareLength() + q_w*q_w);
Vector3 v_v(vel);
Vector3 qv_v = q_v.CrossProduct(v_v) + q_w*v_v;
float32 qv_w = - q_v.DotProduct(v_v);
Vector3 qvq1_v = qv_v.CrossProduct(q1_v) + qv_w*q1_v + q1_w*qv_v;
Vector3 speed = qvq1_v * velocity;
particle->speed = speed.Length();
particle->direction = speed/particle->speed;
if (particle->direction.x <= EPSILON && particle->direction.x >= -EPSILON)
particle->direction.x = 0.f;
if (particle->direction.y <= EPSILON && particle->direction.y >= -EPSILON)
particle->direction.y = 0.f;
if (particle->direction.z <= EPSILON && particle->direction.z >= -EPSILON)
particle->direction.z = 0.f;
if (emitterType == EMITTER_ONCIRCLE)
{
qvq1_v.Normalize();
if(radius)
particle->position += qvq1_v * radius->GetValue(time);
}
particle->angle = atanf(particle->direction.z/particle->direction.x);
if(worldTransformPtr)
{
Matrix4 newTransform = *worldTransformPtr;
newTransform._30 = newTransform._31 = newTransform._32 = 0;
particle->direction = particle->direction*newTransform;
}
}
void ParticleEmitter3D::PrepareEmitterParametersGeneric(Particle * particle, float32 velocity,
int32 emitIndex, const Vector3& tempPosition,
const Matrix3& rotationMatrix)
{
Vector3 vel = Vector3(1.0f, 0.0f, 0.0f);
if(emissionVector)
{
// Yuri Coder, 2013/04/12. Need to invert the directions in the emission vector, since
// their coordinates are in the opposite directions for the Particles Editor.
vel = emissionVector->GetValue(0) * -1.0f;
}
Vector3 rotVect(0, 0, 1);
float32 phi = PI*2*(float32)Random::Instance()->RandFloat();
if(vel.x != 0)
{
rotVect.y = sinf(phi);
rotVect.z = cosf(phi);
rotVect.x = - rotVect.y*vel.y/vel.x - rotVect.z*vel.z/vel.x;
}
else if(vel.y != 0)
{
rotVect.x = cosf(phi);
rotVect.z = sinf(phi);
rotVect.y = - rotVect.z*vel.z/vel.y;
}
else if(vel.z != 0)
{
rotVect.x = cosf(phi);
rotVect.y = sinf(phi);
rotVect.z = 0;
}
rotVect.Normalize();
float32 range = 0;
if(emissionRange)
range = DegToRad(emissionRange->GetValue(time) + angle);
float32 rand05 = (float32)Random::Instance()->RandFloat() - 0.5f;
Vector3 q_v(rotVect*sinf(range*rand05/2));
float32 q_w = cosf(range*rand05/2);
Vector3 q1_v(q_v);
float32 q1_w = -q_w;
q1_v /= (q_v.SquareLength() + q_w*q_w);
q1_w /= (q_v.SquareLength() + q_w*q_w);
Vector3 v_v(vel);
Vector3 qv_v = q_v.CrossProduct(v_v) + q_w*v_v;
float32 qv_w = - q_v.DotProduct(v_v);
Vector3 qvq1_v = qv_v.CrossProduct(q1_v) + qv_w*q1_v + q1_w*qv_v;
particle->speed = qvq1_v * velocity;
// Yuri Coder, 2013/03/26. After discussion with Ivan it appears this angle
// calculation is incorrect. TODO: return to this code later on.
//particle->angle = atanf(particle->direction.z/particle->direction.x);
}