core::vector3df getWindDir()
{
const float time = irr_driver->getDevice()->getTimer()->getTime() / 1000.0f;
GrassShaderProvider *gsp = (GrassShaderProvider *)irr_driver->getCallback(ES_GRASS);
float m_speed = gsp->getSpeed();
return m_speed * vector3df(1., 0., 0.) * cos(time);
}
static
core::vector3df getWind()
{
const core::vector3df pos = irr_driver->getVideoDriver()->getTransform(video::ETS_WORLD).getTranslation();
const float time = irr_driver->getDevice()->getTimer()->getTime() / 1000.0f;
GrassShaderProvider *gsp = (GrassShaderProvider *)irr_driver->getCallback(ES_GRASS);
float m_speed = gsp->getSpeed(), m_amplitude = gsp->getAmplitude();
float strength = (pos.X + pos.Y + pos.Z) * 1.2f + time * m_speed;
strength = noise2d(strength / 10.0f) * m_amplitude * 5;
// * 5 is to work with the existing amplitude values.
// Pre-multiply on the cpu
return irr_driver->getWind() * strength;
}
