# Fluid simulation - Fire Fluid Simulation 3

For each additional quantity , we must allocate an additional texture with the same dimensions as our grid.

### Fire Fluid Simulation 3

To compute the triangle-slice intersection, we intersect each triangle edge with the slice.

Feel bored or anxious? For a more advanced treatment of flames, see Nguyen et al.

To get the gross effect of an obstacle pushing fluid around, we can approximate the obstacle with a basic shape such as a box or a ball and add the obstacle's average velocity to that region of the velocity field.

Description: Accounting for Obstacles in the Computation of the Discrete Laplacian of Pressure We can apply a similar trick for velocity values: whenever we sample a neighboring cell for example, when computing the velocity's divergencewe first check to see if it contains a solid.

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This time, however, we must determine the intersection of each triangle with the current slice.
To deal with these regions, we mark the pixels where the back faces of the volume have been rendered but not the front faces.
Because advection will not preserve the distance field property of a level set, it is common to periodically reinitialize the level set.

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