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Question HDRP path tracing shader high registers allocation count

Discussion in 'HDRP Ray Tracing' started by guoxx_, Dec 29, 2022.

  1. guoxx_

    guoxx_

    Joined:
    Mar 16, 2021
    Posts:
    55
    I profile the HDRP path tracing shader with NSight graphics on RTX 2080Ti, it shows that the register count for a lit shader is quite high (around 128) so warps occupancy is low.

    upload_2022-12-29_14-55-33.png

    I tried to simplify the code and found that a very simple closesthit shader will take 64 registers in Unity which is pretty weird in my understanding. Is a high register count normal for a raytracing shader?
     
    guoxx_, Dec 29, 2022
    #1