Wire a Mono layer into this to adjust where the smoke emits from. A value of 0 will have no fire and 1 will have the full thickness.

Wire an RGB layer into this to set the color of newly emitted smoke.

Adjust the resolution of the smoke. This is the number of voxels across the default imaging window. Higher resolutions will take considerably more time and memory.

The VDB has to be activated so you can source into it. Layer to VDB Leaf Points handles the activation from the SOURCE layer, while the Pyro Source from Layer handles the actual sourcing. The thickness and inputs for these two nodes should match.

The start of the simulation loop. All nodes inside the convex hull (highlighted area) will run every simulation step. The simulation is clipped from -1 to 1 by default, and can be controlled by modifying the Clip X/Y/Z parameters.

The feedback input port is only read on the first frame of the simulation. After that, the feedback output port will contain what was passed into the feedback input port of pyro_block_end6 on the previous frame. Note that the cable structure must be the same. The types and names of the wires must not change.

All feedback wires that match the VDBs to Activate pattern will be activated for new sources, and all feedback wires that match the VDBs to Advect will be advected by velocity. These both are the default *, so the VDBs passed through named Cd and Cd_weight will be resized and advected. Note this pattern is also used to decide if the default density and temperature VDBs will be updated.

To properly simulate color, two VDBs are needed. One is a vector VDB of the pre-multiplied color, the other is a scalar VDB of the amount of color present. These nodes combine these two VDBs into a cable, extract them, and ensure they are named the same so the feedback is consistent.

Takes a 2d velocity field that points inward generated by the previous nodes and projects it onto the VDB to create a 3d inward pointed velocity field.

Instead of having hot air move upwards, the direction of buoyancy is controlled by the direction input. The smoke in this simulation rises to the center of the layer.

Transfers the colors of the COLOR layer to a VDB by projecting the layer onto the VDB.

Perform a weighted sum of the previous Cd and Cd_weight with the newly sourced values.

Computes lighting for the fire’s smoke using an ambient light source. Increasing smoke density (with the Density Scale parameter) increases the contrast of self-shadows.

Computes lighting from the top left of the smoke, providing directional shadows.

Color weights close to zero can generate NANs or Infinity when divided out. You can avoid this by boosting the weight slightly.

Un-premultiply the color by dividing by the color weight. This provides the absolute color of the smoke.

The light field from the lighting nodes is multiplied by the smoke color to get the effective color of the smoke.

Renders the flame into a layer. The camera_ref can use an imported camera from the Camera Import COP to change the view or resolution of the render.