Distortion Blend Mode Specifies the mode that HDRP uses to blend overlaid distortion surfaces. The options are:
• Add: Adds the output distortion value with the current distortion value in the pixel. This is the default mode.
• Multiply: Multiplies the output distortion value with the current distortion value in the pixel.
• Replace: Replaces the current distortion value in the pixel with the output distortion value.
This setting only appears if you enable Distortion.