A geometry nodes setup inspired by Houdini's Pyro Source Spread node. It uses Blender's simulation nodes to diffuse a temperature attribute across the surface of a given geometry, creating a spreading ignition effect. The setup includes a Temperature Point node that allows for the addition of multiple ignition points by combining them with math nodes. Users can specify a start frame and toggle continuous application, enabling the source point to be animated while the simulation calculates the temperature spread.