Week 5: Smoke sim by Fulid in Maya

After trying a variety of methods (replicating keyframes and replacing them with small balls, using parent-child animation for the emission source, etc.) to no avail, I followed the advice to use the more stable maya fluid to create smoke

1.Create a fluid container

In this project, I wanted to have part of the robot as the launch source, so I used the box below it as the container

choose the auto-size,cause I do not want my sim is be trapped in the container box

2.Select the container, and click the fluidShape tab in the Attribute Editor

3.Create fluids cache files

After all the adjustments of the sim,then try to create the cache

1. Select the fluid container.
2. Select nCache > Create New Cache > Maya Fluid > .
3. In the Create Fluid nCache Options, set creation options, if necessary, and then click the Create button.
4. Maya creates a fluids playback nCache file for the selected fluid container.

4. Render

The final result:

The problem is when I try to render the smoke(fluids in maya) in Arnold . No matter how I adjust my parameters, the box border is always there.