Method sphereEmitter

cpp/5_Domain_Specific/smokeParticles/ParticleSystem.cpp:330–369

}

void ParticleSystem::sphereEmitter(uint &index,
                                   vec3f pos,
                                   vec3f vel,
                                   vec3f spread,
                                   float r,
                                   int   n,
                                   float lifetime,
                                   float lifetimeVariance)
{
    float4 *posPtr = m_pos.getHostPtr();
    float4 *velPtr = m_vel.getHostPtr();

    uint start = index;
    uint count = 0;

    for (int i = 0; i < n; i++) {
        vec3f x = randSphere();

        // float dist = length(x);
        if (index < m_numParticles) {
            vec3f p   = pos + x * r;
            float age = 0.0;

            float lt = lifetime + frand() * lifetimeVariance;

            vec3f dir = randSphere();
            dir.y     = fabs(dir.y);
            vec3f v   = vel + dir * spread;

            posPtr[index] = make_float4(p.x, p.y, p.z, age);
            velPtr[index] = make_float4(v.x, v.y, v.z, lt);

            index++;
            count++;
        }
    }

    m_pos.copy(GpuArray<float4>::HOST_TO_DEVICE, start, count);
    m_vel.copy(GpuArray<float4>::HOST_TO_DEVICE, start, count);
}

void ParticleSystem::setModelView(float *m)
{