Mattistic Flame parameter overview (OFX version)

The following list gives a basic description of the available parameters of the Mattistic Flame plugin for OpenFX hosts organized by category.


  • Manage License: Opens a window to view the license status and activate a license (requires an internet connection).
  • Use GPU if available: When enabled the plugin will try to use the graphics card to greatly accelerate rendering (requires CUDA or OpenCL).
  • voxel resolution: Affects how many voxels are generated which determines how detailed the end result will be. Every step doubles the amount of voxels. Higher values lead to longer render times.
  • samples/voxel: How many samples to take for every voxel a camera ray passes through. Increasing this can help reduce sampling artifacts.
  • Mask: An external image input that is applied as a mask when compositing the render over the source.
  • Fuel: An external image input of which the pixel values determine the height of the flames. The image is stretched to fit the bottom of the flame volume.


  • step: A scaling factor for the speed of the animation.
  • offset: An offset in frames for the starting point of the animation.


  • location: The world location of the camera.
  • rotation: The world rotation of the camera.
  • rot. order: The order in which the rotation around the X, Y & Z axes are applied.
  • focal length: The focal length of the camera in mm. This determines the field of view in combination with the sensor size.
  • sensor size hor.: The horizontal size of the sensor in mm.
  • sensor size ver.: The vertical size of the sensor in mm.
  • sensor fit: Determines how the image aspect ratio is fitted to the sensor aspect ratio.
  • motion blur: The amount of directional blur applied to fast movement. This is not true motion blur but an approximation applied as a 2D effect.
  • exposure: A scaling factor for the brightness of the rendered image.
  • white balance: The temperature in K that is considered white. Higher values add more red/orange tones to the image while lower values add more blue.


  • key loc.: The world location of the light source. This is a point light without any falloff over distance.
  • key color: The color of the key light source.
  • key scale: A scaling factor for the amount of light that is emitted by the key light source.


  • color: The color of the smoke when illuminated by a white light.
  • absorption: A scaling factor for how quickly light is absorbed by the smoke as it shines through it.
  • density: Scales the density of the smoke. This also impacts the brightness of the flames as some smoke is needed for the flames to be visible.


  • heat: Scales the temperature of the fire. This influences both the brightness and the color of the flames. The actual brightness also depends on the smoke density and fire brightness parameters.
  • brightness: Scales the brightness of the fire. The actual brightness also depends on the smoke density and fire heat parameters.
  • highlight sat.: The amount by which high values in the rendered image are desaturated.
  • blue core: How visible the blue part of the flame is. Not influenced by the smoke density parameter.
  • transition: The exponent of the transition towards the surface of the flame. Higher values lead to thinner flame surfaces.
  • dissipation: The exponent of the transition away from the surface of the flame. Higher values lead to thinner flame surfaces.


  • scale: World scale of the volume.
  • offset: World offset of the volume.
  • dimensions: World dimensions of the volume before scaling.
  • rotation: World rotation of the volume around an upward pointing axis.
  • wind: Mimics a wind effect displacing the flames as they rise. The strength is set independently along the X, Y & Z axes.


  • random seed: An initial value for the random number generator used to generate the turbulence and fuel variation.
  • turb. scale: The scale of the turbulence. A higher value will create smaller details making the flames appear larger.
  • turb. strength: The amount by which the turbulence effect is applied to the flames.
  • fuel multiplier: A scaling factor for the fuel source.
  • fuel variation: The amount by which a noise pattern is applied to the fuel. Can be used to separate a uniform fuel source into smaller individual flames.