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What's that 3DL trick to speed up renders with hair?

RAMWolffRAMWolff Posts: 10,382
in The Commons

I'm testing out a hair I bought on a character I made... so I've had this render running over 17 minutes, it's totally stuck on the hair. 

I remembered there was a trick of sorts to speed up render time with objects like hair and other bits with transparenecy maps but can not remember.  Can someone point me to a tutorial or post the "fix" here? 

Thanks so much

Richard

Comments

  • scorpioscorpio Posts: 8,533

    Apply Uber surface shader and then in the surfaces tab turn off Occulsion

  • nDelphinDelphi Posts: 1,974

    Good to know, scorpio, in case I find myself working with 3Delight again.

  • Oso3DOso3D Posts: 15,115

    I think I still encountered problems with some hair, even with occlusion off. It is one of my big frustrations with 3dl.

     

  • RAMWolffRAMWolff Posts: 10,382

    I thought there was a way to do this without bringing Uber like do you think a geo shell would work?

  • scorpioscorpio Posts: 8,533
    RAMWolff said:

    I thought there was a way to do this without bringing Uber like do you think a geo shell would work?

    There is a trick of using a geo shell, I never tried it so sorry can't remember what the method is, I think it involved turning off raytracing as well as occulsion (which will speed up rendering more but you loose shadows) and using the geoshell to create the shadow - sorry I really just have a vague idea of what it was.

  • Mustakettu85Mustakettu85 Posts: 2,933
    RAMWolff said:

    I thought there was a way to do this without bringing Uber like do you think a geo shell would work?

    Sorry but no. You need UberSurface because it's the only vanilla shader coming with the right sort of rendertime script. You need to turn an attribute off on your specific surface. A geoshell creates extra geometry, it doesn't interfere with your original surface.

    The geoshell technique is for getting coloured shadows. It still requires UberSurface - for both the original surface and the geoshell.

  • RAMWolffRAMWolff Posts: 10,382

    Oh, OK.  I think I have that Uber hair shader.  I'll give it a try next time.  Thank you! 

  • JOdelJOdel Posts: 6,322

    I remember being told to turn of cast shadows. Which may work for short hair, but could look strange with long.

  • j cadej cade Posts: 2,310

    If you're using AOAs lights you can set the Shadow hitmode to primitive (either for all or flagged surfaces) which will make them ignore transparency maps depending on how complex the hair is it can end up saving a good chunk of time

     

     

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