FidelityFX Depth of Field

This sample demonstrates the use of the FidelityFX Depth of Field effect.

For details on the techniques that underpin the Depth of Field effect you can refer to the respective technique documentation .


  • Windows

  • DirectX(R)12

  • Vulkan(R)

UI elements

The sample contains various UI elements to help you explore the technique it demonstrates. The table below summarises the UI elements and what they control within the sample.

Element name





Simulated camera aperture radius in meters. At zero, a pinhole camera is simulated, which has no depth of field.

Sensor Size


Simulated camera sensor width in meters. This is used along with the field of view for calculating focal length.

Focus Distance

Range dynamically adjusted to scene

Distance from the camera at which objects will be in focus.



Maximum number of sample rings used in the blur kernel.

Blur Size Limit


Maximum blur radius in multiples of y resolution. 0.02 means ~20px at 1080p or ~40px at 4K.

Enable Kernel Ring Merging

Checked, Unchecked

Controls whether the inner rings of the blur kernel may be merged for better performance.

Setting up FidelityFX Depth of Field

The sample contains a render module for DOF which manages context lifecycle and dispatch. As it’s a post-processing effect it takes only the color and depth buffers as inputs.

The output is produced in-place (in the same color buffer) as an optimization. Before dispatch, the scale and bias parameters for computing the circle of confusion are calculated using helper functions provided in the SDK.

Sample Controls and Configurations

For sample controls, configuration, and FidelityFX Cauldron Framework UI element details, see Running the samples .

See also