Select the Phoenix Simulator and open the Grid rollout. Set the Scene Scale to 1.5 - this will slightly slow down the simulation. Set the Cell Size to 0.65 and change the X/Y/Z dimensions of the grid such that the painted areas of the chair are included in the bounds of the Simulator box. This will save some simulation time as those empty voxels will not be calculated in vain. Set the Adaptive Grid option to Smoke, and the Threshold to 0.02. The Adaptive Grid option allows the container to grow in size once the content of the specified channel near the walls of the simulator reaches the Threshold value. In this case, the container will increase in size when there is smoke near the walls. Enable the Expand and Don't Shrink option - because fire simulations tend to be turbulent, it is possible that a certain portion of the container will oscillate between being completely empty and filled with smoke/temperature. This could cause the Adaptive Grid option to constantly resize the bounds of the simulation, producing undesirable results (such as sharply cutting off the fire). Enable Maximum Expansion and set the X/Y/Z dimensions according to your needs. In this tutorial, a Phoenix Plain Force is used to add wind blowing from the left so extra space is provided to the right where the fire is expected to go. Set the Extra Margin to 5 - this option allows the Adaptation to keep a number of voxels close to the walls as a buffer zone and expand the grid earlier than usual. This can be especially useful when simulating fast-moving objects or explosions as it allows the simulator to expand before any clipping occurs. |