# Understand execution order

The following diagram shows the order in which the High Definition Render Pipeline (HDRP) executes render passes. 

For more information about injection points, refer to [injection points](Custom-Pass-Injection-Points.md).

![](Images/HDRP-frame-graph-diagram.png)

## Post-processing effect execution order

The post-processing system in HDRP applies post-processing effects in a specific order. The system also combines some effects into the same compute shader stack to minimize the number of passes.

### Execution order and effect grouping

HDRP executes post processing effects in the following order, from top to bottom.

| Post-processing passes                             | Compute shader stack  | Final post-processing pass |
| -------------------------------------------------- | --------------------- | -------------------------- |
| NaN Killer                                         |                       |                            |
| Anti-aliasing (TAA, SMAA)                          |                       |                            |
| Depth of Field                                     |                       |                            |
| Motion Blur                                        |                       |                            |
| Panini Projection                                  |                       |                            |
| Bloom (Pyramid)                                    |                       |                            |
| Color Grading (LUT Baking)                         |                       |                            |
| Screen Space Lens Flare (written in bloom texture) |                       |                            |
| Data driven lens flare                             |                       |                            |
|                                                    | Lens Distortion       |                            |
|                                                    | Chromatic Aberration  |                            |
|                                                    | Bloom (Apply)         |                            |
|                                                    | Vignette              |                            |
|                                                    | Color Grading (Apply) |                            |
|                                                    |                       | Antialiasing (FXAA)        |
|                                                    |                       | Film Grain                 |
|                                                    |                       | 8-bit Dithering            |