private void FixedUpdate()
{
// Check here for any wall changes.
// DOES NOT WORK. No clue why the compute buffers are not reading and writing correctly. Oh well.
// Good education though. I now understand what it's doing.
var timeStep = Time.deltaTime * 1;
// Advect velocity against its self
Advent(_velocity.Current, _velocity.Past, timeStep);
// Advect temperature and density against velocity
Advent(_densityTemp.Current, _densityTemp.Past, timeStep);
_velocity.Swap();
_densityTemp.Swap();
Debug.Log("READ?");
Debug.Break();
// Apply forces here.
ApplyBuoyancy(_velocity.Current, _densityTemp.Past, _velocity.Past, timeStep);
_velocity.Swap();
// Refresh the impulse of density and temperature
ApplyImpulseToDensityTemp(new Vector2(0, 28), 4);
_densityTemp.Swap();
// Calculates how divergent the velocity is
ComputeDivergence(_divergence, _velocity.Past);
// Clearing pressure pressure for Jacobi loops.
ClearBuffer(_pressure.Past);
for (var i = 0; i < 50; ++i)
{
Jacobi(_pressure.Current, _pressure.Past, _divergence);
_pressure.Swap();
}
SubtractGradient(_velocity.Current, _pressure.Past, _velocity.Past);
_velocity.Swap();
}
private void FixedUpdate()
{
//Obstacles only need to be added once unless changed.
AddObstacles();
//Set the density field and obstacle color.
GUIMat.SetColor("_FluidColor", FluidColor);
GUIMat.SetColor("_ObstacleColor", ObstacleColor);
var dt = Time.fixedDeltaTime * 10;
//Advect velocity against its self
Advect(_velocityTex.Read, _velocityTex.Read, _velocityTex.Write, VelocityDissipation, dt);
//Advect temperature against velocity
Advect(_velocityTex.Read, _temperatureTex.Read, _temperatureTex.Write, TemperatureDissipation, dt);
//Advect density against velocity
Advect(_velocityTex.Read, _densityTex.Read, _densityTex.Write, DensityDissipation, dt);
_velocityTex.Swap();
_temperatureTex.Swap();
_densityTex.Swap();
//Determine how the flow of the fluid changes the velocity
ApplyBuoyancy(_velocityTex.Read, _temperatureTex.Read, _densityTex.Read, _velocityTex.Write, dt);
_velocityTex.Swap();
//Refresh the impulse of density and temperature
ApplyImpulse(_temperatureTex.Read, _temperatureTex.Write, _implusePos, ImpulseRadius, ImpulseTemperature);
ApplyImpulse(_densityTex.Read, _densityTex.Write, _implusePos, ImpulseRadius, ImpulseDensity);
_temperatureTex.Swap();
_densityTex.Swap();
//If left click down add impulse, if right click down remove impulse from mouse pos.
// if (Input.GetMouseButton(0) || Input.GetMouseButton(1))
// {
// Vector2 pos = Input.mousePosition;
//
// pos.x -= _rect.xMin;
// pos.y -= _rect.yMin;
//
// pos.x /= _rect.width;
// pos.y /= _rect.height;
//
// var sign = Input.GetMouseButton(0) ? 1.0f : -1.0f;
//
// ApplyImpulse(_temperatureTex.Read, _temperatureTex.Write, pos, MouseImpulseRadius, ImpulseTemperature);
// ApplyImpulse(_densityTex.Read, _densityTex.Write, pos, MouseImpulseRadius, ImpulseDensity * sign);
//
// _temperatureTex.Swap();
// _densityTex.Swap();
// }
//Calculates how divergent the velocity is
ComputeDivergence(_velocityTex.Read, _divergenceTex);
ClearSurface(_pressureTex.Read);
for (var i = 0; i < NumJacobiIterations; ++i)
{
Jacobi(_pressureTex.Read, _divergenceTex, _pressureTex.Write);
_pressureTex.Swap();
}
//Use the pressure tex that was last rendered into. This computes divergence free velocity
SubtractGradient(_velocityTex.Read, _pressureTex.Read, _velocityTex.Write);
_velocityTex.Swap();
//Render the tex you want to see into gui tex. Will only use the red channel
GUIMat.SetTexture("_Obstacles", _obstaclesTex);
Graphics.Blit(_densityTex.Read, _guiTex, GUIMat);
}